82710e993a
Authored by: Andriy Gapon <avg@FreeBSD.org> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Dan Kimmel <dan.kimmel@delphix.com> Reviewed by: Saso Kiselkov <saso.kiselkov@nexenta.com> Approved by: Dan McDonald <danmcd@joyent.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Ported-by: Giuseppe Di Natale <dinatale2@llnl.gov> OpenZFS-issue: https://www.illumos.org/issues/5220 OpenZFS-commit: https://github.com/openzfs/openzfs/commit/403a8da Closes #6260
7887 lines
237 KiB
C
7887 lines
237 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, Joyent, Inc. All rights reserved.
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* Copyright (c) 2011, 2017 by Delphix. All rights reserved.
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* Copyright (c) 2014 by Saso Kiselkov. All rights reserved.
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* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
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*/
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/*
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* DVA-based Adjustable Replacement Cache
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*
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* While much of the theory of operation used here is
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* based on the self-tuning, low overhead replacement cache
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* presented by Megiddo and Modha at FAST 2003, there are some
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* significant differences:
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*
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* 1. The Megiddo and Modha model assumes any page is evictable.
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* Pages in its cache cannot be "locked" into memory. This makes
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* the eviction algorithm simple: evict the last page in the list.
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* This also make the performance characteristics easy to reason
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* about. Our cache is not so simple. At any given moment, some
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* subset of the blocks in the cache are un-evictable because we
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* have handed out a reference to them. Blocks are only evictable
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* when there are no external references active. This makes
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* eviction far more problematic: we choose to evict the evictable
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* blocks that are the "lowest" in the list.
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*
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* There are times when it is not possible to evict the requested
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* space. In these circumstances we are unable to adjust the cache
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* size. To prevent the cache growing unbounded at these times we
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* implement a "cache throttle" that slows the flow of new data
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* into the cache until we can make space available.
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*
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* 2. The Megiddo and Modha model assumes a fixed cache size.
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* Pages are evicted when the cache is full and there is a cache
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* miss. Our model has a variable sized cache. It grows with
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* high use, but also tries to react to memory pressure from the
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* operating system: decreasing its size when system memory is
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* tight.
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*
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* 3. The Megiddo and Modha model assumes a fixed page size. All
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* elements of the cache are therefore exactly the same size. So
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* when adjusting the cache size following a cache miss, its simply
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* a matter of choosing a single page to evict. In our model, we
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* have variable sized cache blocks (rangeing from 512 bytes to
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* 128K bytes). We therefore choose a set of blocks to evict to make
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* space for a cache miss that approximates as closely as possible
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* the space used by the new block.
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*
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* See also: "ARC: A Self-Tuning, Low Overhead Replacement Cache"
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* by N. Megiddo & D. Modha, FAST 2003
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*/
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/*
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* The locking model:
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*
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* A new reference to a cache buffer can be obtained in two
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* ways: 1) via a hash table lookup using the DVA as a key,
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* or 2) via one of the ARC lists. The arc_read() interface
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* uses method 1, while the internal ARC algorithms for
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* adjusting the cache use method 2. We therefore provide two
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* types of locks: 1) the hash table lock array, and 2) the
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* ARC list locks.
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*
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* Buffers do not have their own mutexes, rather they rely on the
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* hash table mutexes for the bulk of their protection (i.e. most
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* fields in the arc_buf_hdr_t are protected by these mutexes).
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*
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* buf_hash_find() returns the appropriate mutex (held) when it
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* locates the requested buffer in the hash table. It returns
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* NULL for the mutex if the buffer was not in the table.
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*
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* buf_hash_remove() expects the appropriate hash mutex to be
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* already held before it is invoked.
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*
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* Each ARC state also has a mutex which is used to protect the
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* buffer list associated with the state. When attempting to
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* obtain a hash table lock while holding an ARC list lock you
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* must use: mutex_tryenter() to avoid deadlock. Also note that
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* the active state mutex must be held before the ghost state mutex.
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*
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* It as also possible to register a callback which is run when the
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* arc_meta_limit is reached and no buffers can be safely evicted. In
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* this case the arc user should drop a reference on some arc buffers so
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* they can be reclaimed and the arc_meta_limit honored. For example,
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* when using the ZPL each dentry holds a references on a znode. These
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* dentries must be pruned before the arc buffer holding the znode can
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* be safely evicted.
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*
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* Note that the majority of the performance stats are manipulated
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* with atomic operations.
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*
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* The L2ARC uses the l2ad_mtx on each vdev for the following:
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*
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* - L2ARC buflist creation
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* - L2ARC buflist eviction
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* - L2ARC write completion, which walks L2ARC buflists
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* - ARC header destruction, as it removes from L2ARC buflists
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* - ARC header release, as it removes from L2ARC buflists
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*/
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/*
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* ARC operation:
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*
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* Every block that is in the ARC is tracked by an arc_buf_hdr_t structure.
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* This structure can point either to a block that is still in the cache or to
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* one that is only accessible in an L2 ARC device, or it can provide
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* information about a block that was recently evicted. If a block is
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* only accessible in the L2ARC, then the arc_buf_hdr_t only has enough
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* information to retrieve it from the L2ARC device. This information is
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* stored in the l2arc_buf_hdr_t sub-structure of the arc_buf_hdr_t. A block
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* that is in this state cannot access the data directly.
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*
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* Blocks that are actively being referenced or have not been evicted
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* are cached in the L1ARC. The L1ARC (l1arc_buf_hdr_t) is a structure within
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* the arc_buf_hdr_t that will point to the data block in memory. A block can
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* only be read by a consumer if it has an l1arc_buf_hdr_t. The L1ARC
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* caches data in two ways -- in a list of ARC buffers (arc_buf_t) and
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* also in the arc_buf_hdr_t's private physical data block pointer (b_pabd).
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*
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* The L1ARC's data pointer may or may not be uncompressed. The ARC has the
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* ability to store the physical data (b_pabd) associated with the DVA of the
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* arc_buf_hdr_t. Since the b_pabd is a copy of the on-disk physical block,
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* it will match its on-disk compression characteristics. This behavior can be
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* disabled by setting 'zfs_compressed_arc_enabled' to B_FALSE. When the
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* compressed ARC functionality is disabled, the b_pabd will point to an
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* uncompressed version of the on-disk data.
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*
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* Data in the L1ARC is not accessed by consumers of the ARC directly. Each
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* arc_buf_hdr_t can have multiple ARC buffers (arc_buf_t) which reference it.
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* Each ARC buffer (arc_buf_t) is being actively accessed by a specific ARC
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* consumer. The ARC will provide references to this data and will keep it
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* cached until it is no longer in use. The ARC caches only the L1ARC's physical
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* data block and will evict any arc_buf_t that is no longer referenced. The
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* amount of memory consumed by the arc_buf_ts' data buffers can be seen via the
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* "overhead_size" kstat.
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*
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* Depending on the consumer, an arc_buf_t can be requested in uncompressed or
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* compressed form. The typical case is that consumers will want uncompressed
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* data, and when that happens a new data buffer is allocated where the data is
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* decompressed for them to use. Currently the only consumer who wants
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* compressed arc_buf_t's is "zfs send", when it streams data exactly as it
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* exists on disk. When this happens, the arc_buf_t's data buffer is shared
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* with the arc_buf_hdr_t.
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*
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* Here is a diagram showing an arc_buf_hdr_t referenced by two arc_buf_t's. The
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* first one is owned by a compressed send consumer (and therefore references
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* the same compressed data buffer as the arc_buf_hdr_t) and the second could be
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* used by any other consumer (and has its own uncompressed copy of the data
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* buffer).
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*
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* arc_buf_hdr_t
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* +-----------+
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* | fields |
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* | common to |
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* | L1- and |
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* | L2ARC |
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* +-----------+
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* | l2arc_buf_hdr_t
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* | |
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* +-----------+
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* | l1arc_buf_hdr_t
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* | | arc_buf_t
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* | b_buf +------------>+-----------+ arc_buf_t
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* | b_pabd +-+ |b_next +---->+-----------+
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* +-----------+ | |-----------| |b_next +-->NULL
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* | |b_comp = T | +-----------+
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* | |b_data +-+ |b_comp = F |
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* | +-----------+ | |b_data +-+
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* +->+------+ | +-----------+ |
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* compressed | | | |
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* data | |<--------------+ | uncompressed
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* +------+ compressed, | data
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* shared +-->+------+
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* data | |
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* | |
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* +------+
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*
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* When a consumer reads a block, the ARC must first look to see if the
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* arc_buf_hdr_t is cached. If the hdr is cached then the ARC allocates a new
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* arc_buf_t and either copies uncompressed data into a new data buffer from an
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* existing uncompressed arc_buf_t, decompresses the hdr's b_pabd buffer into a
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* new data buffer, or shares the hdr's b_pabd buffer, depending on whether the
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* hdr is compressed and the desired compression characteristics of the
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* arc_buf_t consumer. If the arc_buf_t ends up sharing data with the
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* arc_buf_hdr_t and both of them are uncompressed then the arc_buf_t must be
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* the last buffer in the hdr's b_buf list, however a shared compressed buf can
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* be anywhere in the hdr's list.
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*
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* The diagram below shows an example of an uncompressed ARC hdr that is
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* sharing its data with an arc_buf_t (note that the shared uncompressed buf is
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* the last element in the buf list):
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*
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* arc_buf_hdr_t
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* +-----------+
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* | |
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* | |
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* | |
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* +-----------+
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* l2arc_buf_hdr_t| |
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* | |
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* +-----------+
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* l1arc_buf_hdr_t| |
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* | | arc_buf_t (shared)
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* | b_buf +------------>+---------+ arc_buf_t
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* | | |b_next +---->+---------+
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* | b_pabd +-+ |---------| |b_next +-->NULL
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* +-----------+ | | | +---------+
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* | |b_data +-+ | |
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* | +---------+ | |b_data +-+
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* +->+------+ | +---------+ |
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* | | | |
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* uncompressed | | | |
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* data +------+ | |
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* ^ +->+------+ |
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* | uncompressed | | |
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* | data | | |
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* | +------+ |
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* +---------------------------------+
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*
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* Writing to the ARC requires that the ARC first discard the hdr's b_pabd
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* since the physical block is about to be rewritten. The new data contents
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* will be contained in the arc_buf_t. As the I/O pipeline performs the write,
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* it may compress the data before writing it to disk. The ARC will be called
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* with the transformed data and will bcopy the transformed on-disk block into
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* a newly allocated b_pabd. Writes are always done into buffers which have
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* either been loaned (and hence are new and don't have other readers) or
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* buffers which have been released (and hence have their own hdr, if there
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* were originally other readers of the buf's original hdr). This ensures that
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* the ARC only needs to update a single buf and its hdr after a write occurs.
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*
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* When the L2ARC is in use, it will also take advantage of the b_pabd. The
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* L2ARC will always write the contents of b_pabd to the L2ARC. This means
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* that when compressed ARC is enabled that the L2ARC blocks are identical
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* to the on-disk block in the main data pool. This provides a significant
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* advantage since the ARC can leverage the bp's checksum when reading from the
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* L2ARC to determine if the contents are valid. However, if the compressed
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* ARC is disabled, then the L2ARC's block must be transformed to look
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* like the physical block in the main data pool before comparing the
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* checksum and determining its validity.
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*/
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#include <sys/spa.h>
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#include <sys/zio.h>
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#include <sys/spa_impl.h>
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#include <sys/zio_compress.h>
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#include <sys/zio_checksum.h>
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#include <sys/zfs_context.h>
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#include <sys/arc.h>
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#include <sys/refcount.h>
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#include <sys/vdev.h>
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#include <sys/vdev_impl.h>
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#include <sys/dsl_pool.h>
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#include <sys/zio_checksum.h>
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#include <sys/multilist.h>
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#include <sys/abd.h>
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#ifdef _KERNEL
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#include <sys/vmsystm.h>
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#include <vm/anon.h>
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#include <sys/fs/swapnode.h>
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#include <sys/zpl.h>
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#include <linux/mm_compat.h>
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#endif
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#include <sys/callb.h>
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#include <sys/kstat.h>
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#include <sys/dmu_tx.h>
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#include <zfs_fletcher.h>
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#include <sys/arc_impl.h>
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#include <sys/trace_arc.h>
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#ifndef _KERNEL
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/* set with ZFS_DEBUG=watch, to enable watchpoints on frozen buffers */
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boolean_t arc_watch = B_FALSE;
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#endif
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static kmutex_t arc_reclaim_lock;
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static kcondvar_t arc_reclaim_thread_cv;
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static boolean_t arc_reclaim_thread_exit;
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static kcondvar_t arc_reclaim_waiters_cv;
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/*
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* The number of headers to evict in arc_evict_state_impl() before
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* dropping the sublist lock and evicting from another sublist. A lower
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* value means we're more likely to evict the "correct" header (i.e. the
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* oldest header in the arc state), but comes with higher overhead
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* (i.e. more invocations of arc_evict_state_impl()).
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*/
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int zfs_arc_evict_batch_limit = 10;
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/* number of seconds before growing cache again */
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static int arc_grow_retry = 5;
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/* shift of arc_c for calculating overflow limit in arc_get_data_impl */
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int zfs_arc_overflow_shift = 8;
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/* shift of arc_c for calculating both min and max arc_p */
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static int arc_p_min_shift = 4;
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/* log2(fraction of arc to reclaim) */
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static int arc_shrink_shift = 7;
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/* percent of pagecache to reclaim arc to */
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#ifdef _KERNEL
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static uint_t zfs_arc_pc_percent = 0;
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#endif
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/*
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* log2(fraction of ARC which must be free to allow growing).
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* I.e. If there is less than arc_c >> arc_no_grow_shift free memory,
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* when reading a new block into the ARC, we will evict an equal-sized block
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* from the ARC.
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*
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* This must be less than arc_shrink_shift, so that when we shrink the ARC,
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* we will still not allow it to grow.
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*/
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int arc_no_grow_shift = 5;
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/*
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* minimum lifespan of a prefetch block in clock ticks
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* (initialized in arc_init())
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*/
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static int arc_min_prefetch_lifespan;
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/*
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* If this percent of memory is free, don't throttle.
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*/
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int arc_lotsfree_percent = 10;
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static int arc_dead;
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/*
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* The arc has filled available memory and has now warmed up.
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*/
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static boolean_t arc_warm;
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/*
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* log2 fraction of the zio arena to keep free.
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*/
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int arc_zio_arena_free_shift = 2;
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/*
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* These tunables are for performance analysis.
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*/
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unsigned long zfs_arc_max = 0;
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unsigned long zfs_arc_min = 0;
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unsigned long zfs_arc_meta_limit = 0;
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unsigned long zfs_arc_meta_min = 0;
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unsigned long zfs_arc_dnode_limit = 0;
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unsigned long zfs_arc_dnode_reduce_percent = 10;
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int zfs_arc_grow_retry = 0;
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int zfs_arc_shrink_shift = 0;
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int zfs_arc_p_min_shift = 0;
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int zfs_arc_average_blocksize = 8 * 1024; /* 8KB */
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int zfs_compressed_arc_enabled = B_TRUE;
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/*
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* ARC will evict meta buffers that exceed arc_meta_limit. This
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* tunable make arc_meta_limit adjustable for different workloads.
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*/
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unsigned long zfs_arc_meta_limit_percent = 75;
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/*
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* Percentage that can be consumed by dnodes of ARC meta buffers.
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*/
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unsigned long zfs_arc_dnode_limit_percent = 10;
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/*
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* These tunables are Linux specific
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*/
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unsigned long zfs_arc_sys_free = 0;
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int zfs_arc_min_prefetch_lifespan = 0;
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int zfs_arc_p_aggressive_disable = 1;
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int zfs_arc_p_dampener_disable = 1;
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int zfs_arc_meta_prune = 10000;
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int zfs_arc_meta_strategy = ARC_STRATEGY_META_BALANCED;
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int zfs_arc_meta_adjust_restarts = 4096;
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int zfs_arc_lotsfree_percent = 10;
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/* The 6 states: */
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static arc_state_t ARC_anon;
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static arc_state_t ARC_mru;
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static arc_state_t ARC_mru_ghost;
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static arc_state_t ARC_mfu;
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static arc_state_t ARC_mfu_ghost;
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static arc_state_t ARC_l2c_only;
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typedef struct arc_stats {
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kstat_named_t arcstat_hits;
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kstat_named_t arcstat_misses;
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kstat_named_t arcstat_demand_data_hits;
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kstat_named_t arcstat_demand_data_misses;
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kstat_named_t arcstat_demand_metadata_hits;
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kstat_named_t arcstat_demand_metadata_misses;
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kstat_named_t arcstat_prefetch_data_hits;
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kstat_named_t arcstat_prefetch_data_misses;
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kstat_named_t arcstat_prefetch_metadata_hits;
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kstat_named_t arcstat_prefetch_metadata_misses;
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kstat_named_t arcstat_mru_hits;
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kstat_named_t arcstat_mru_ghost_hits;
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kstat_named_t arcstat_mfu_hits;
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kstat_named_t arcstat_mfu_ghost_hits;
|
|
kstat_named_t arcstat_deleted;
|
|
/*
|
|
* Number of buffers that could not be evicted because the hash lock
|
|
* was held by another thread. The lock may not necessarily be held
|
|
* by something using the same buffer, since hash locks are shared
|
|
* by multiple buffers.
|
|
*/
|
|
kstat_named_t arcstat_mutex_miss;
|
|
/*
|
|
* Number of buffers skipped because they have I/O in progress, are
|
|
* indrect prefetch buffers that have not lived long enough, or are
|
|
* not from the spa we're trying to evict from.
|
|
*/
|
|
kstat_named_t arcstat_evict_skip;
|
|
/*
|
|
* Number of times arc_evict_state() was unable to evict enough
|
|
* buffers to reach its target amount.
|
|
*/
|
|
kstat_named_t arcstat_evict_not_enough;
|
|
kstat_named_t arcstat_evict_l2_cached;
|
|
kstat_named_t arcstat_evict_l2_eligible;
|
|
kstat_named_t arcstat_evict_l2_ineligible;
|
|
kstat_named_t arcstat_evict_l2_skip;
|
|
kstat_named_t arcstat_hash_elements;
|
|
kstat_named_t arcstat_hash_elements_max;
|
|
kstat_named_t arcstat_hash_collisions;
|
|
kstat_named_t arcstat_hash_chains;
|
|
kstat_named_t arcstat_hash_chain_max;
|
|
kstat_named_t arcstat_p;
|
|
kstat_named_t arcstat_c;
|
|
kstat_named_t arcstat_c_min;
|
|
kstat_named_t arcstat_c_max;
|
|
kstat_named_t arcstat_size;
|
|
/*
|
|
* Number of compressed bytes stored in the arc_buf_hdr_t's b_pabd.
|
|
* Note that the compressed bytes may match the uncompressed bytes
|
|
* if the block is either not compressed or compressed arc is disabled.
|
|
*/
|
|
kstat_named_t arcstat_compressed_size;
|
|
/*
|
|
* Uncompressed size of the data stored in b_pabd. If compressed
|
|
* arc is disabled then this value will be identical to the stat
|
|
* above.
|
|
*/
|
|
kstat_named_t arcstat_uncompressed_size;
|
|
/*
|
|
* Number of bytes stored in all the arc_buf_t's. This is classified
|
|
* as "overhead" since this data is typically short-lived and will
|
|
* be evicted from the arc when it becomes unreferenced unless the
|
|
* zfs_keep_uncompressed_metadata or zfs_keep_uncompressed_level
|
|
* values have been set (see comment in dbuf.c for more information).
|
|
*/
|
|
kstat_named_t arcstat_overhead_size;
|
|
/*
|
|
* Number of bytes consumed by internal ARC structures necessary
|
|
* for tracking purposes; these structures are not actually
|
|
* backed by ARC buffers. This includes arc_buf_hdr_t structures
|
|
* (allocated via arc_buf_hdr_t_full and arc_buf_hdr_t_l2only
|
|
* caches), and arc_buf_t structures (allocated via arc_buf_t
|
|
* cache).
|
|
*/
|
|
kstat_named_t arcstat_hdr_size;
|
|
/*
|
|
* Number of bytes consumed by ARC buffers of type equal to
|
|
* ARC_BUFC_DATA. This is generally consumed by buffers backing
|
|
* on disk user data (e.g. plain file contents).
|
|
*/
|
|
kstat_named_t arcstat_data_size;
|
|
/*
|
|
* Number of bytes consumed by ARC buffers of type equal to
|
|
* ARC_BUFC_METADATA. This is generally consumed by buffers
|
|
* backing on disk data that is used for internal ZFS
|
|
* structures (e.g. ZAP, dnode, indirect blocks, etc).
|
|
*/
|
|
kstat_named_t arcstat_metadata_size;
|
|
/*
|
|
* Number of bytes consumed by dmu_buf_impl_t objects.
|
|
*/
|
|
kstat_named_t arcstat_dbuf_size;
|
|
/*
|
|
* Number of bytes consumed by dnode_t objects.
|
|
*/
|
|
kstat_named_t arcstat_dnode_size;
|
|
/*
|
|
* Number of bytes consumed by bonus buffers.
|
|
*/
|
|
kstat_named_t arcstat_bonus_size;
|
|
/*
|
|
* Total number of bytes consumed by ARC buffers residing in the
|
|
* arc_anon state. This includes *all* buffers in the arc_anon
|
|
* state; e.g. data, metadata, evictable, and unevictable buffers
|
|
* are all included in this value.
|
|
*/
|
|
kstat_named_t arcstat_anon_size;
|
|
/*
|
|
* Number of bytes consumed by ARC buffers that meet the
|
|
* following criteria: backing buffers of type ARC_BUFC_DATA,
|
|
* residing in the arc_anon state, and are eligible for eviction
|
|
* (e.g. have no outstanding holds on the buffer).
|
|
*/
|
|
kstat_named_t arcstat_anon_evictable_data;
|
|
/*
|
|
* Number of bytes consumed by ARC buffers that meet the
|
|
* following criteria: backing buffers of type ARC_BUFC_METADATA,
|
|
* residing in the arc_anon state, and are eligible for eviction
|
|
* (e.g. have no outstanding holds on the buffer).
|
|
*/
|
|
kstat_named_t arcstat_anon_evictable_metadata;
|
|
/*
|
|
* Total number of bytes consumed by ARC buffers residing in the
|
|
* arc_mru state. This includes *all* buffers in the arc_mru
|
|
* state; e.g. data, metadata, evictable, and unevictable buffers
|
|
* are all included in this value.
|
|
*/
|
|
kstat_named_t arcstat_mru_size;
|
|
/*
|
|
* Number of bytes consumed by ARC buffers that meet the
|
|
* following criteria: backing buffers of type ARC_BUFC_DATA,
|
|
* residing in the arc_mru state, and are eligible for eviction
|
|
* (e.g. have no outstanding holds on the buffer).
|
|
*/
|
|
kstat_named_t arcstat_mru_evictable_data;
|
|
/*
|
|
* Number of bytes consumed by ARC buffers that meet the
|
|
* following criteria: backing buffers of type ARC_BUFC_METADATA,
|
|
* residing in the arc_mru state, and are eligible for eviction
|
|
* (e.g. have no outstanding holds on the buffer).
|
|
*/
|
|
kstat_named_t arcstat_mru_evictable_metadata;
|
|
/*
|
|
* Total number of bytes that *would have been* consumed by ARC
|
|
* buffers in the arc_mru_ghost state. The key thing to note
|
|
* here, is the fact that this size doesn't actually indicate
|
|
* RAM consumption. The ghost lists only consist of headers and
|
|
* don't actually have ARC buffers linked off of these headers.
|
|
* Thus, *if* the headers had associated ARC buffers, these
|
|
* buffers *would have* consumed this number of bytes.
|
|
*/
|
|
kstat_named_t arcstat_mru_ghost_size;
|
|
/*
|
|
* Number of bytes that *would have been* consumed by ARC
|
|
* buffers that are eligible for eviction, of type
|
|
* ARC_BUFC_DATA, and linked off the arc_mru_ghost state.
|
|
*/
|
|
kstat_named_t arcstat_mru_ghost_evictable_data;
|
|
/*
|
|
* Number of bytes that *would have been* consumed by ARC
|
|
* buffers that are eligible for eviction, of type
|
|
* ARC_BUFC_METADATA, and linked off the arc_mru_ghost state.
|
|
*/
|
|
kstat_named_t arcstat_mru_ghost_evictable_metadata;
|
|
/*
|
|
* Total number of bytes consumed by ARC buffers residing in the
|
|
* arc_mfu state. This includes *all* buffers in the arc_mfu
|
|
* state; e.g. data, metadata, evictable, and unevictable buffers
|
|
* are all included in this value.
|
|
*/
|
|
kstat_named_t arcstat_mfu_size;
|
|
/*
|
|
* Number of bytes consumed by ARC buffers that are eligible for
|
|
* eviction, of type ARC_BUFC_DATA, and reside in the arc_mfu
|
|
* state.
|
|
*/
|
|
kstat_named_t arcstat_mfu_evictable_data;
|
|
/*
|
|
* Number of bytes consumed by ARC buffers that are eligible for
|
|
* eviction, of type ARC_BUFC_METADATA, and reside in the
|
|
* arc_mfu state.
|
|
*/
|
|
kstat_named_t arcstat_mfu_evictable_metadata;
|
|
/*
|
|
* Total number of bytes that *would have been* consumed by ARC
|
|
* buffers in the arc_mfu_ghost state. See the comment above
|
|
* arcstat_mru_ghost_size for more details.
|
|
*/
|
|
kstat_named_t arcstat_mfu_ghost_size;
|
|
/*
|
|
* Number of bytes that *would have been* consumed by ARC
|
|
* buffers that are eligible for eviction, of type
|
|
* ARC_BUFC_DATA, and linked off the arc_mfu_ghost state.
|
|
*/
|
|
kstat_named_t arcstat_mfu_ghost_evictable_data;
|
|
/*
|
|
* Number of bytes that *would have been* consumed by ARC
|
|
* buffers that are eligible for eviction, of type
|
|
* ARC_BUFC_METADATA, and linked off the arc_mru_ghost state.
|
|
*/
|
|
kstat_named_t arcstat_mfu_ghost_evictable_metadata;
|
|
kstat_named_t arcstat_l2_hits;
|
|
kstat_named_t arcstat_l2_misses;
|
|
kstat_named_t arcstat_l2_feeds;
|
|
kstat_named_t arcstat_l2_rw_clash;
|
|
kstat_named_t arcstat_l2_read_bytes;
|
|
kstat_named_t arcstat_l2_write_bytes;
|
|
kstat_named_t arcstat_l2_writes_sent;
|
|
kstat_named_t arcstat_l2_writes_done;
|
|
kstat_named_t arcstat_l2_writes_error;
|
|
kstat_named_t arcstat_l2_writes_lock_retry;
|
|
kstat_named_t arcstat_l2_evict_lock_retry;
|
|
kstat_named_t arcstat_l2_evict_reading;
|
|
kstat_named_t arcstat_l2_evict_l1cached;
|
|
kstat_named_t arcstat_l2_free_on_write;
|
|
kstat_named_t arcstat_l2_abort_lowmem;
|
|
kstat_named_t arcstat_l2_cksum_bad;
|
|
kstat_named_t arcstat_l2_io_error;
|
|
kstat_named_t arcstat_l2_size;
|
|
kstat_named_t arcstat_l2_asize;
|
|
kstat_named_t arcstat_l2_hdr_size;
|
|
kstat_named_t arcstat_memory_throttle_count;
|
|
kstat_named_t arcstat_memory_direct_count;
|
|
kstat_named_t arcstat_memory_indirect_count;
|
|
kstat_named_t arcstat_no_grow;
|
|
kstat_named_t arcstat_tempreserve;
|
|
kstat_named_t arcstat_loaned_bytes;
|
|
kstat_named_t arcstat_prune;
|
|
kstat_named_t arcstat_meta_used;
|
|
kstat_named_t arcstat_meta_limit;
|
|
kstat_named_t arcstat_dnode_limit;
|
|
kstat_named_t arcstat_meta_max;
|
|
kstat_named_t arcstat_meta_min;
|
|
kstat_named_t arcstat_sync_wait_for_async;
|
|
kstat_named_t arcstat_demand_hit_predictive_prefetch;
|
|
kstat_named_t arcstat_need_free;
|
|
kstat_named_t arcstat_sys_free;
|
|
} arc_stats_t;
|
|
|
|
static arc_stats_t arc_stats = {
|
|
{ "hits", KSTAT_DATA_UINT64 },
|
|
{ "misses", KSTAT_DATA_UINT64 },
|
|
{ "demand_data_hits", KSTAT_DATA_UINT64 },
|
|
{ "demand_data_misses", KSTAT_DATA_UINT64 },
|
|
{ "demand_metadata_hits", KSTAT_DATA_UINT64 },
|
|
{ "demand_metadata_misses", KSTAT_DATA_UINT64 },
|
|
{ "prefetch_data_hits", KSTAT_DATA_UINT64 },
|
|
{ "prefetch_data_misses", KSTAT_DATA_UINT64 },
|
|
{ "prefetch_metadata_hits", KSTAT_DATA_UINT64 },
|
|
{ "prefetch_metadata_misses", KSTAT_DATA_UINT64 },
|
|
{ "mru_hits", KSTAT_DATA_UINT64 },
|
|
{ "mru_ghost_hits", KSTAT_DATA_UINT64 },
|
|
{ "mfu_hits", KSTAT_DATA_UINT64 },
|
|
{ "mfu_ghost_hits", KSTAT_DATA_UINT64 },
|
|
{ "deleted", KSTAT_DATA_UINT64 },
|
|
{ "mutex_miss", KSTAT_DATA_UINT64 },
|
|
{ "evict_skip", KSTAT_DATA_UINT64 },
|
|
{ "evict_not_enough", KSTAT_DATA_UINT64 },
|
|
{ "evict_l2_cached", KSTAT_DATA_UINT64 },
|
|
{ "evict_l2_eligible", KSTAT_DATA_UINT64 },
|
|
{ "evict_l2_ineligible", KSTAT_DATA_UINT64 },
|
|
{ "evict_l2_skip", KSTAT_DATA_UINT64 },
|
|
{ "hash_elements", KSTAT_DATA_UINT64 },
|
|
{ "hash_elements_max", KSTAT_DATA_UINT64 },
|
|
{ "hash_collisions", KSTAT_DATA_UINT64 },
|
|
{ "hash_chains", KSTAT_DATA_UINT64 },
|
|
{ "hash_chain_max", KSTAT_DATA_UINT64 },
|
|
{ "p", KSTAT_DATA_UINT64 },
|
|
{ "c", KSTAT_DATA_UINT64 },
|
|
{ "c_min", KSTAT_DATA_UINT64 },
|
|
{ "c_max", KSTAT_DATA_UINT64 },
|
|
{ "size", KSTAT_DATA_UINT64 },
|
|
{ "compressed_size", KSTAT_DATA_UINT64 },
|
|
{ "uncompressed_size", KSTAT_DATA_UINT64 },
|
|
{ "overhead_size", KSTAT_DATA_UINT64 },
|
|
{ "hdr_size", KSTAT_DATA_UINT64 },
|
|
{ "data_size", KSTAT_DATA_UINT64 },
|
|
{ "metadata_size", KSTAT_DATA_UINT64 },
|
|
{ "dbuf_size", KSTAT_DATA_UINT64 },
|
|
{ "dnode_size", KSTAT_DATA_UINT64 },
|
|
{ "bonus_size", KSTAT_DATA_UINT64 },
|
|
{ "anon_size", KSTAT_DATA_UINT64 },
|
|
{ "anon_evictable_data", KSTAT_DATA_UINT64 },
|
|
{ "anon_evictable_metadata", KSTAT_DATA_UINT64 },
|
|
{ "mru_size", KSTAT_DATA_UINT64 },
|
|
{ "mru_evictable_data", KSTAT_DATA_UINT64 },
|
|
{ "mru_evictable_metadata", KSTAT_DATA_UINT64 },
|
|
{ "mru_ghost_size", KSTAT_DATA_UINT64 },
|
|
{ "mru_ghost_evictable_data", KSTAT_DATA_UINT64 },
|
|
{ "mru_ghost_evictable_metadata", KSTAT_DATA_UINT64 },
|
|
{ "mfu_size", KSTAT_DATA_UINT64 },
|
|
{ "mfu_evictable_data", KSTAT_DATA_UINT64 },
|
|
{ "mfu_evictable_metadata", KSTAT_DATA_UINT64 },
|
|
{ "mfu_ghost_size", KSTAT_DATA_UINT64 },
|
|
{ "mfu_ghost_evictable_data", KSTAT_DATA_UINT64 },
|
|
{ "mfu_ghost_evictable_metadata", KSTAT_DATA_UINT64 },
|
|
{ "l2_hits", KSTAT_DATA_UINT64 },
|
|
{ "l2_misses", KSTAT_DATA_UINT64 },
|
|
{ "l2_feeds", KSTAT_DATA_UINT64 },
|
|
{ "l2_rw_clash", KSTAT_DATA_UINT64 },
|
|
{ "l2_read_bytes", KSTAT_DATA_UINT64 },
|
|
{ "l2_write_bytes", KSTAT_DATA_UINT64 },
|
|
{ "l2_writes_sent", KSTAT_DATA_UINT64 },
|
|
{ "l2_writes_done", KSTAT_DATA_UINT64 },
|
|
{ "l2_writes_error", KSTAT_DATA_UINT64 },
|
|
{ "l2_writes_lock_retry", KSTAT_DATA_UINT64 },
|
|
{ "l2_evict_lock_retry", KSTAT_DATA_UINT64 },
|
|
{ "l2_evict_reading", KSTAT_DATA_UINT64 },
|
|
{ "l2_evict_l1cached", KSTAT_DATA_UINT64 },
|
|
{ "l2_free_on_write", KSTAT_DATA_UINT64 },
|
|
{ "l2_abort_lowmem", KSTAT_DATA_UINT64 },
|
|
{ "l2_cksum_bad", KSTAT_DATA_UINT64 },
|
|
{ "l2_io_error", KSTAT_DATA_UINT64 },
|
|
{ "l2_size", KSTAT_DATA_UINT64 },
|
|
{ "l2_asize", KSTAT_DATA_UINT64 },
|
|
{ "l2_hdr_size", KSTAT_DATA_UINT64 },
|
|
{ "memory_throttle_count", KSTAT_DATA_UINT64 },
|
|
{ "memory_direct_count", KSTAT_DATA_UINT64 },
|
|
{ "memory_indirect_count", KSTAT_DATA_UINT64 },
|
|
{ "arc_no_grow", KSTAT_DATA_UINT64 },
|
|
{ "arc_tempreserve", KSTAT_DATA_UINT64 },
|
|
{ "arc_loaned_bytes", KSTAT_DATA_UINT64 },
|
|
{ "arc_prune", KSTAT_DATA_UINT64 },
|
|
{ "arc_meta_used", KSTAT_DATA_UINT64 },
|
|
{ "arc_meta_limit", KSTAT_DATA_UINT64 },
|
|
{ "arc_dnode_limit", KSTAT_DATA_UINT64 },
|
|
{ "arc_meta_max", KSTAT_DATA_UINT64 },
|
|
{ "arc_meta_min", KSTAT_DATA_UINT64 },
|
|
{ "sync_wait_for_async", KSTAT_DATA_UINT64 },
|
|
{ "demand_hit_predictive_prefetch", KSTAT_DATA_UINT64 },
|
|
{ "arc_need_free", KSTAT_DATA_UINT64 },
|
|
{ "arc_sys_free", KSTAT_DATA_UINT64 }
|
|
};
|
|
|
|
#define ARCSTAT(stat) (arc_stats.stat.value.ui64)
|
|
|
|
#define ARCSTAT_INCR(stat, val) \
|
|
atomic_add_64(&arc_stats.stat.value.ui64, (val))
|
|
|
|
#define ARCSTAT_BUMP(stat) ARCSTAT_INCR(stat, 1)
|
|
#define ARCSTAT_BUMPDOWN(stat) ARCSTAT_INCR(stat, -1)
|
|
|
|
#define ARCSTAT_MAX(stat, val) { \
|
|
uint64_t m; \
|
|
while ((val) > (m = arc_stats.stat.value.ui64) && \
|
|
(m != atomic_cas_64(&arc_stats.stat.value.ui64, m, (val)))) \
|
|
continue; \
|
|
}
|
|
|
|
#define ARCSTAT_MAXSTAT(stat) \
|
|
ARCSTAT_MAX(stat##_max, arc_stats.stat.value.ui64)
|
|
|
|
/*
|
|
* We define a macro to allow ARC hits/misses to be easily broken down by
|
|
* two separate conditions, giving a total of four different subtypes for
|
|
* each of hits and misses (so eight statistics total).
|
|
*/
|
|
#define ARCSTAT_CONDSTAT(cond1, stat1, notstat1, cond2, stat2, notstat2, stat) \
|
|
if (cond1) { \
|
|
if (cond2) { \
|
|
ARCSTAT_BUMP(arcstat_##stat1##_##stat2##_##stat); \
|
|
} else { \
|
|
ARCSTAT_BUMP(arcstat_##stat1##_##notstat2##_##stat); \
|
|
} \
|
|
} else { \
|
|
if (cond2) { \
|
|
ARCSTAT_BUMP(arcstat_##notstat1##_##stat2##_##stat); \
|
|
} else { \
|
|
ARCSTAT_BUMP(arcstat_##notstat1##_##notstat2##_##stat);\
|
|
} \
|
|
}
|
|
|
|
kstat_t *arc_ksp;
|
|
static arc_state_t *arc_anon;
|
|
static arc_state_t *arc_mru;
|
|
static arc_state_t *arc_mru_ghost;
|
|
static arc_state_t *arc_mfu;
|
|
static arc_state_t *arc_mfu_ghost;
|
|
static arc_state_t *arc_l2c_only;
|
|
|
|
/*
|
|
* There are several ARC variables that are critical to export as kstats --
|
|
* but we don't want to have to grovel around in the kstat whenever we wish to
|
|
* manipulate them. For these variables, we therefore define them to be in
|
|
* terms of the statistic variable. This assures that we are not introducing
|
|
* the possibility of inconsistency by having shadow copies of the variables,
|
|
* while still allowing the code to be readable.
|
|
*/
|
|
#define arc_size ARCSTAT(arcstat_size) /* actual total arc size */
|
|
#define arc_p ARCSTAT(arcstat_p) /* target size of MRU */
|
|
#define arc_c ARCSTAT(arcstat_c) /* target size of cache */
|
|
#define arc_c_min ARCSTAT(arcstat_c_min) /* min target cache size */
|
|
#define arc_c_max ARCSTAT(arcstat_c_max) /* max target cache size */
|
|
#define arc_no_grow ARCSTAT(arcstat_no_grow) /* do not grow cache size */
|
|
#define arc_tempreserve ARCSTAT(arcstat_tempreserve)
|
|
#define arc_loaned_bytes ARCSTAT(arcstat_loaned_bytes)
|
|
#define arc_meta_limit ARCSTAT(arcstat_meta_limit) /* max size for metadata */
|
|
#define arc_dnode_limit ARCSTAT(arcstat_dnode_limit) /* max size for dnodes */
|
|
#define arc_meta_min ARCSTAT(arcstat_meta_min) /* min size for metadata */
|
|
#define arc_meta_used ARCSTAT(arcstat_meta_used) /* size of metadata */
|
|
#define arc_meta_max ARCSTAT(arcstat_meta_max) /* max size of metadata */
|
|
#define arc_dbuf_size ARCSTAT(arcstat_dbuf_size) /* dbuf metadata */
|
|
#define arc_dnode_size ARCSTAT(arcstat_dnode_size) /* dnode metadata */
|
|
#define arc_bonus_size ARCSTAT(arcstat_bonus_size) /* bonus buffer metadata */
|
|
#define arc_need_free ARCSTAT(arcstat_need_free) /* bytes to be freed */
|
|
#define arc_sys_free ARCSTAT(arcstat_sys_free) /* target system free bytes */
|
|
|
|
/* compressed size of entire arc */
|
|
#define arc_compressed_size ARCSTAT(arcstat_compressed_size)
|
|
/* uncompressed size of entire arc */
|
|
#define arc_uncompressed_size ARCSTAT(arcstat_uncompressed_size)
|
|
/* number of bytes in the arc from arc_buf_t's */
|
|
#define arc_overhead_size ARCSTAT(arcstat_overhead_size)
|
|
|
|
static list_t arc_prune_list;
|
|
static kmutex_t arc_prune_mtx;
|
|
static taskq_t *arc_prune_taskq;
|
|
|
|
#define GHOST_STATE(state) \
|
|
((state) == arc_mru_ghost || (state) == arc_mfu_ghost || \
|
|
(state) == arc_l2c_only)
|
|
|
|
#define HDR_IN_HASH_TABLE(hdr) ((hdr)->b_flags & ARC_FLAG_IN_HASH_TABLE)
|
|
#define HDR_IO_IN_PROGRESS(hdr) ((hdr)->b_flags & ARC_FLAG_IO_IN_PROGRESS)
|
|
#define HDR_IO_ERROR(hdr) ((hdr)->b_flags & ARC_FLAG_IO_ERROR)
|
|
#define HDR_PREFETCH(hdr) ((hdr)->b_flags & ARC_FLAG_PREFETCH)
|
|
#define HDR_COMPRESSION_ENABLED(hdr) \
|
|
((hdr)->b_flags & ARC_FLAG_COMPRESSED_ARC)
|
|
|
|
#define HDR_L2CACHE(hdr) ((hdr)->b_flags & ARC_FLAG_L2CACHE)
|
|
#define HDR_L2_READING(hdr) \
|
|
(((hdr)->b_flags & ARC_FLAG_IO_IN_PROGRESS) && \
|
|
((hdr)->b_flags & ARC_FLAG_HAS_L2HDR))
|
|
#define HDR_L2_WRITING(hdr) ((hdr)->b_flags & ARC_FLAG_L2_WRITING)
|
|
#define HDR_L2_EVICTED(hdr) ((hdr)->b_flags & ARC_FLAG_L2_EVICTED)
|
|
#define HDR_L2_WRITE_HEAD(hdr) ((hdr)->b_flags & ARC_FLAG_L2_WRITE_HEAD)
|
|
#define HDR_SHARED_DATA(hdr) ((hdr)->b_flags & ARC_FLAG_SHARED_DATA)
|
|
|
|
#define HDR_ISTYPE_METADATA(hdr) \
|
|
((hdr)->b_flags & ARC_FLAG_BUFC_METADATA)
|
|
#define HDR_ISTYPE_DATA(hdr) (!HDR_ISTYPE_METADATA(hdr))
|
|
|
|
#define HDR_HAS_L1HDR(hdr) ((hdr)->b_flags & ARC_FLAG_HAS_L1HDR)
|
|
#define HDR_HAS_L2HDR(hdr) ((hdr)->b_flags & ARC_FLAG_HAS_L2HDR)
|
|
|
|
/* For storing compression mode in b_flags */
|
|
#define HDR_COMPRESS_OFFSET (highbit64(ARC_FLAG_COMPRESS_0) - 1)
|
|
|
|
#define HDR_GET_COMPRESS(hdr) ((enum zio_compress)BF32_GET((hdr)->b_flags, \
|
|
HDR_COMPRESS_OFFSET, SPA_COMPRESSBITS))
|
|
#define HDR_SET_COMPRESS(hdr, cmp) BF32_SET((hdr)->b_flags, \
|
|
HDR_COMPRESS_OFFSET, SPA_COMPRESSBITS, (cmp));
|
|
|
|
#define ARC_BUF_LAST(buf) ((buf)->b_next == NULL)
|
|
#define ARC_BUF_SHARED(buf) ((buf)->b_flags & ARC_BUF_FLAG_SHARED)
|
|
#define ARC_BUF_COMPRESSED(buf) ((buf)->b_flags & ARC_BUF_FLAG_COMPRESSED)
|
|
|
|
/*
|
|
* Other sizes
|
|
*/
|
|
|
|
#define HDR_FULL_SIZE ((int64_t)sizeof (arc_buf_hdr_t))
|
|
#define HDR_L2ONLY_SIZE ((int64_t)offsetof(arc_buf_hdr_t, b_l1hdr))
|
|
|
|
/*
|
|
* Hash table routines
|
|
*/
|
|
|
|
#define HT_LOCK_ALIGN 64
|
|
#define HT_LOCK_PAD (P2NPHASE(sizeof (kmutex_t), (HT_LOCK_ALIGN)))
|
|
|
|
struct ht_lock {
|
|
kmutex_t ht_lock;
|
|
#ifdef _KERNEL
|
|
unsigned char pad[HT_LOCK_PAD];
|
|
#endif
|
|
};
|
|
|
|
#define BUF_LOCKS 8192
|
|
typedef struct buf_hash_table {
|
|
uint64_t ht_mask;
|
|
arc_buf_hdr_t **ht_table;
|
|
struct ht_lock ht_locks[BUF_LOCKS];
|
|
} buf_hash_table_t;
|
|
|
|
static buf_hash_table_t buf_hash_table;
|
|
|
|
#define BUF_HASH_INDEX(spa, dva, birth) \
|
|
(buf_hash(spa, dva, birth) & buf_hash_table.ht_mask)
|
|
#define BUF_HASH_LOCK_NTRY(idx) (buf_hash_table.ht_locks[idx & (BUF_LOCKS-1)])
|
|
#define BUF_HASH_LOCK(idx) (&(BUF_HASH_LOCK_NTRY(idx).ht_lock))
|
|
#define HDR_LOCK(hdr) \
|
|
(BUF_HASH_LOCK(BUF_HASH_INDEX(hdr->b_spa, &hdr->b_dva, hdr->b_birth)))
|
|
|
|
uint64_t zfs_crc64_table[256];
|
|
|
|
/*
|
|
* Level 2 ARC
|
|
*/
|
|
|
|
#define L2ARC_WRITE_SIZE (8 * 1024 * 1024) /* initial write max */
|
|
#define L2ARC_HEADROOM 2 /* num of writes */
|
|
|
|
/*
|
|
* If we discover during ARC scan any buffers to be compressed, we boost
|
|
* our headroom for the next scanning cycle by this percentage multiple.
|
|
*/
|
|
#define L2ARC_HEADROOM_BOOST 200
|
|
#define L2ARC_FEED_SECS 1 /* caching interval secs */
|
|
#define L2ARC_FEED_MIN_MS 200 /* min caching interval ms */
|
|
|
|
/*
|
|
* We can feed L2ARC from two states of ARC buffers, mru and mfu,
|
|
* and each of the state has two types: data and metadata.
|
|
*/
|
|
#define L2ARC_FEED_TYPES 4
|
|
|
|
#define l2arc_writes_sent ARCSTAT(arcstat_l2_writes_sent)
|
|
#define l2arc_writes_done ARCSTAT(arcstat_l2_writes_done)
|
|
|
|
/* L2ARC Performance Tunables */
|
|
unsigned long l2arc_write_max = L2ARC_WRITE_SIZE; /* def max write size */
|
|
unsigned long l2arc_write_boost = L2ARC_WRITE_SIZE; /* extra warmup write */
|
|
unsigned long l2arc_headroom = L2ARC_HEADROOM; /* # of dev writes */
|
|
unsigned long l2arc_headroom_boost = L2ARC_HEADROOM_BOOST;
|
|
unsigned long l2arc_feed_secs = L2ARC_FEED_SECS; /* interval seconds */
|
|
unsigned long l2arc_feed_min_ms = L2ARC_FEED_MIN_MS; /* min interval msecs */
|
|
int l2arc_noprefetch = B_TRUE; /* don't cache prefetch bufs */
|
|
int l2arc_feed_again = B_TRUE; /* turbo warmup */
|
|
int l2arc_norw = B_FALSE; /* no reads during writes */
|
|
|
|
/*
|
|
* L2ARC Internals
|
|
*/
|
|
static list_t L2ARC_dev_list; /* device list */
|
|
static list_t *l2arc_dev_list; /* device list pointer */
|
|
static kmutex_t l2arc_dev_mtx; /* device list mutex */
|
|
static l2arc_dev_t *l2arc_dev_last; /* last device used */
|
|
static list_t L2ARC_free_on_write; /* free after write buf list */
|
|
static list_t *l2arc_free_on_write; /* free after write list ptr */
|
|
static kmutex_t l2arc_free_on_write_mtx; /* mutex for list */
|
|
static uint64_t l2arc_ndev; /* number of devices */
|
|
|
|
typedef struct l2arc_read_callback {
|
|
arc_buf_hdr_t *l2rcb_hdr; /* read header */
|
|
blkptr_t l2rcb_bp; /* original blkptr */
|
|
zbookmark_phys_t l2rcb_zb; /* original bookmark */
|
|
int l2rcb_flags; /* original flags */
|
|
abd_t *l2rcb_abd; /* temporary buffer */
|
|
} l2arc_read_callback_t;
|
|
|
|
typedef struct l2arc_data_free {
|
|
/* protected by l2arc_free_on_write_mtx */
|
|
abd_t *l2df_abd;
|
|
size_t l2df_size;
|
|
arc_buf_contents_t l2df_type;
|
|
list_node_t l2df_list_node;
|
|
} l2arc_data_free_t;
|
|
|
|
static kmutex_t l2arc_feed_thr_lock;
|
|
static kcondvar_t l2arc_feed_thr_cv;
|
|
static uint8_t l2arc_thread_exit;
|
|
|
|
static abd_t *arc_get_data_abd(arc_buf_hdr_t *, uint64_t, void *);
|
|
static void *arc_get_data_buf(arc_buf_hdr_t *, uint64_t, void *);
|
|
static void arc_get_data_impl(arc_buf_hdr_t *, uint64_t, void *);
|
|
static void arc_free_data_abd(arc_buf_hdr_t *, abd_t *, uint64_t, void *);
|
|
static void arc_free_data_buf(arc_buf_hdr_t *, void *, uint64_t, void *);
|
|
static void arc_free_data_impl(arc_buf_hdr_t *hdr, uint64_t size, void *tag);
|
|
static void arc_hdr_free_pabd(arc_buf_hdr_t *);
|
|
static void arc_hdr_alloc_pabd(arc_buf_hdr_t *);
|
|
static void arc_access(arc_buf_hdr_t *, kmutex_t *);
|
|
static boolean_t arc_is_overflowing(void);
|
|
static void arc_buf_watch(arc_buf_t *);
|
|
static void arc_tuning_update(void);
|
|
static void arc_prune_async(int64_t);
|
|
static uint64_t arc_all_memory(void);
|
|
|
|
static arc_buf_contents_t arc_buf_type(arc_buf_hdr_t *);
|
|
static uint32_t arc_bufc_to_flags(arc_buf_contents_t);
|
|
static inline void arc_hdr_set_flags(arc_buf_hdr_t *hdr, arc_flags_t flags);
|
|
static inline void arc_hdr_clear_flags(arc_buf_hdr_t *hdr, arc_flags_t flags);
|
|
|
|
static boolean_t l2arc_write_eligible(uint64_t, arc_buf_hdr_t *);
|
|
static void l2arc_read_done(zio_t *);
|
|
|
|
static uint64_t
|
|
buf_hash(uint64_t spa, const dva_t *dva, uint64_t birth)
|
|
{
|
|
uint8_t *vdva = (uint8_t *)dva;
|
|
uint64_t crc = -1ULL;
|
|
int i;
|
|
|
|
ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY);
|
|
|
|
for (i = 0; i < sizeof (dva_t); i++)
|
|
crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ vdva[i]) & 0xFF];
|
|
|
|
crc ^= (spa>>8) ^ birth;
|
|
|
|
return (crc);
|
|
}
|
|
|
|
#define HDR_EMPTY(hdr) \
|
|
((hdr)->b_dva.dva_word[0] == 0 && \
|
|
(hdr)->b_dva.dva_word[1] == 0)
|
|
|
|
#define HDR_EQUAL(spa, dva, birth, hdr) \
|
|
((hdr)->b_dva.dva_word[0] == (dva)->dva_word[0]) && \
|
|
((hdr)->b_dva.dva_word[1] == (dva)->dva_word[1]) && \
|
|
((hdr)->b_birth == birth) && ((hdr)->b_spa == spa)
|
|
|
|
static void
|
|
buf_discard_identity(arc_buf_hdr_t *hdr)
|
|
{
|
|
hdr->b_dva.dva_word[0] = 0;
|
|
hdr->b_dva.dva_word[1] = 0;
|
|
hdr->b_birth = 0;
|
|
}
|
|
|
|
static arc_buf_hdr_t *
|
|
buf_hash_find(uint64_t spa, const blkptr_t *bp, kmutex_t **lockp)
|
|
{
|
|
const dva_t *dva = BP_IDENTITY(bp);
|
|
uint64_t birth = BP_PHYSICAL_BIRTH(bp);
|
|
uint64_t idx = BUF_HASH_INDEX(spa, dva, birth);
|
|
kmutex_t *hash_lock = BUF_HASH_LOCK(idx);
|
|
arc_buf_hdr_t *hdr;
|
|
|
|
mutex_enter(hash_lock);
|
|
for (hdr = buf_hash_table.ht_table[idx]; hdr != NULL;
|
|
hdr = hdr->b_hash_next) {
|
|
if (HDR_EQUAL(spa, dva, birth, hdr)) {
|
|
*lockp = hash_lock;
|
|
return (hdr);
|
|
}
|
|
}
|
|
mutex_exit(hash_lock);
|
|
*lockp = NULL;
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Insert an entry into the hash table. If there is already an element
|
|
* equal to elem in the hash table, then the already existing element
|
|
* will be returned and the new element will not be inserted.
|
|
* Otherwise returns NULL.
|
|
* If lockp == NULL, the caller is assumed to already hold the hash lock.
|
|
*/
|
|
static arc_buf_hdr_t *
|
|
buf_hash_insert(arc_buf_hdr_t *hdr, kmutex_t **lockp)
|
|
{
|
|
uint64_t idx = BUF_HASH_INDEX(hdr->b_spa, &hdr->b_dva, hdr->b_birth);
|
|
kmutex_t *hash_lock = BUF_HASH_LOCK(idx);
|
|
arc_buf_hdr_t *fhdr;
|
|
uint32_t i;
|
|
|
|
ASSERT(!DVA_IS_EMPTY(&hdr->b_dva));
|
|
ASSERT(hdr->b_birth != 0);
|
|
ASSERT(!HDR_IN_HASH_TABLE(hdr));
|
|
|
|
if (lockp != NULL) {
|
|
*lockp = hash_lock;
|
|
mutex_enter(hash_lock);
|
|
} else {
|
|
ASSERT(MUTEX_HELD(hash_lock));
|
|
}
|
|
|
|
for (fhdr = buf_hash_table.ht_table[idx], i = 0; fhdr != NULL;
|
|
fhdr = fhdr->b_hash_next, i++) {
|
|
if (HDR_EQUAL(hdr->b_spa, &hdr->b_dva, hdr->b_birth, fhdr))
|
|
return (fhdr);
|
|
}
|
|
|
|
hdr->b_hash_next = buf_hash_table.ht_table[idx];
|
|
buf_hash_table.ht_table[idx] = hdr;
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_IN_HASH_TABLE);
|
|
|
|
/* collect some hash table performance data */
|
|
if (i > 0) {
|
|
ARCSTAT_BUMP(arcstat_hash_collisions);
|
|
if (i == 1)
|
|
ARCSTAT_BUMP(arcstat_hash_chains);
|
|
|
|
ARCSTAT_MAX(arcstat_hash_chain_max, i);
|
|
}
|
|
|
|
ARCSTAT_BUMP(arcstat_hash_elements);
|
|
ARCSTAT_MAXSTAT(arcstat_hash_elements);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
static void
|
|
buf_hash_remove(arc_buf_hdr_t *hdr)
|
|
{
|
|
arc_buf_hdr_t *fhdr, **hdrp;
|
|
uint64_t idx = BUF_HASH_INDEX(hdr->b_spa, &hdr->b_dva, hdr->b_birth);
|
|
|
|
ASSERT(MUTEX_HELD(BUF_HASH_LOCK(idx)));
|
|
ASSERT(HDR_IN_HASH_TABLE(hdr));
|
|
|
|
hdrp = &buf_hash_table.ht_table[idx];
|
|
while ((fhdr = *hdrp) != hdr) {
|
|
ASSERT3P(fhdr, !=, NULL);
|
|
hdrp = &fhdr->b_hash_next;
|
|
}
|
|
*hdrp = hdr->b_hash_next;
|
|
hdr->b_hash_next = NULL;
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_IN_HASH_TABLE);
|
|
|
|
/* collect some hash table performance data */
|
|
ARCSTAT_BUMPDOWN(arcstat_hash_elements);
|
|
|
|
if (buf_hash_table.ht_table[idx] &&
|
|
buf_hash_table.ht_table[idx]->b_hash_next == NULL)
|
|
ARCSTAT_BUMPDOWN(arcstat_hash_chains);
|
|
}
|
|
|
|
/*
|
|
* Global data structures and functions for the buf kmem cache.
|
|
*/
|
|
static kmem_cache_t *hdr_full_cache;
|
|
static kmem_cache_t *hdr_l2only_cache;
|
|
static kmem_cache_t *buf_cache;
|
|
|
|
static void
|
|
buf_fini(void)
|
|
{
|
|
int i;
|
|
|
|
#if defined(_KERNEL) && defined(HAVE_SPL)
|
|
/*
|
|
* Large allocations which do not require contiguous pages
|
|
* should be using vmem_free() in the linux kernel\
|
|
*/
|
|
vmem_free(buf_hash_table.ht_table,
|
|
(buf_hash_table.ht_mask + 1) * sizeof (void *));
|
|
#else
|
|
kmem_free(buf_hash_table.ht_table,
|
|
(buf_hash_table.ht_mask + 1) * sizeof (void *));
|
|
#endif
|
|
for (i = 0; i < BUF_LOCKS; i++)
|
|
mutex_destroy(&buf_hash_table.ht_locks[i].ht_lock);
|
|
kmem_cache_destroy(hdr_full_cache);
|
|
kmem_cache_destroy(hdr_l2only_cache);
|
|
kmem_cache_destroy(buf_cache);
|
|
}
|
|
|
|
/*
|
|
* Constructor callback - called when the cache is empty
|
|
* and a new buf is requested.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
hdr_full_cons(void *vbuf, void *unused, int kmflag)
|
|
{
|
|
arc_buf_hdr_t *hdr = vbuf;
|
|
|
|
bzero(hdr, HDR_FULL_SIZE);
|
|
cv_init(&hdr->b_l1hdr.b_cv, NULL, CV_DEFAULT, NULL);
|
|
refcount_create(&hdr->b_l1hdr.b_refcnt);
|
|
mutex_init(&hdr->b_l1hdr.b_freeze_lock, NULL, MUTEX_DEFAULT, NULL);
|
|
list_link_init(&hdr->b_l1hdr.b_arc_node);
|
|
list_link_init(&hdr->b_l2hdr.b_l2node);
|
|
multilist_link_init(&hdr->b_l1hdr.b_arc_node);
|
|
arc_space_consume(HDR_FULL_SIZE, ARC_SPACE_HDRS);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
hdr_l2only_cons(void *vbuf, void *unused, int kmflag)
|
|
{
|
|
arc_buf_hdr_t *hdr = vbuf;
|
|
|
|
bzero(hdr, HDR_L2ONLY_SIZE);
|
|
arc_space_consume(HDR_L2ONLY_SIZE, ARC_SPACE_L2HDRS);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
buf_cons(void *vbuf, void *unused, int kmflag)
|
|
{
|
|
arc_buf_t *buf = vbuf;
|
|
|
|
bzero(buf, sizeof (arc_buf_t));
|
|
mutex_init(&buf->b_evict_lock, NULL, MUTEX_DEFAULT, NULL);
|
|
arc_space_consume(sizeof (arc_buf_t), ARC_SPACE_HDRS);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Destructor callback - called when a cached buf is
|
|
* no longer required.
|
|
*/
|
|
/* ARGSUSED */
|
|
static void
|
|
hdr_full_dest(void *vbuf, void *unused)
|
|
{
|
|
arc_buf_hdr_t *hdr = vbuf;
|
|
|
|
ASSERT(HDR_EMPTY(hdr));
|
|
cv_destroy(&hdr->b_l1hdr.b_cv);
|
|
refcount_destroy(&hdr->b_l1hdr.b_refcnt);
|
|
mutex_destroy(&hdr->b_l1hdr.b_freeze_lock);
|
|
ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
|
|
arc_space_return(HDR_FULL_SIZE, ARC_SPACE_HDRS);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
hdr_l2only_dest(void *vbuf, void *unused)
|
|
{
|
|
ASSERTV(arc_buf_hdr_t *hdr = vbuf);
|
|
|
|
ASSERT(HDR_EMPTY(hdr));
|
|
arc_space_return(HDR_L2ONLY_SIZE, ARC_SPACE_L2HDRS);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
buf_dest(void *vbuf, void *unused)
|
|
{
|
|
arc_buf_t *buf = vbuf;
|
|
|
|
mutex_destroy(&buf->b_evict_lock);
|
|
arc_space_return(sizeof (arc_buf_t), ARC_SPACE_HDRS);
|
|
}
|
|
|
|
/*
|
|
* Reclaim callback -- invoked when memory is low.
|
|
*/
|
|
/* ARGSUSED */
|
|
static void
|
|
hdr_recl(void *unused)
|
|
{
|
|
dprintf("hdr_recl called\n");
|
|
/*
|
|
* umem calls the reclaim func when we destroy the buf cache,
|
|
* which is after we do arc_fini().
|
|
*/
|
|
if (!arc_dead)
|
|
cv_signal(&arc_reclaim_thread_cv);
|
|
}
|
|
|
|
static void
|
|
buf_init(void)
|
|
{
|
|
uint64_t *ct = NULL;
|
|
uint64_t hsize = 1ULL << 12;
|
|
int i, j;
|
|
|
|
/*
|
|
* The hash table is big enough to fill all of physical memory
|
|
* with an average block size of zfs_arc_average_blocksize (default 8K).
|
|
* By default, the table will take up
|
|
* totalmem * sizeof(void*) / 8K (1MB per GB with 8-byte pointers).
|
|
*/
|
|
while (hsize * zfs_arc_average_blocksize < arc_all_memory())
|
|
hsize <<= 1;
|
|
retry:
|
|
buf_hash_table.ht_mask = hsize - 1;
|
|
#if defined(_KERNEL) && defined(HAVE_SPL)
|
|
/*
|
|
* Large allocations which do not require contiguous pages
|
|
* should be using vmem_alloc() in the linux kernel
|
|
*/
|
|
buf_hash_table.ht_table =
|
|
vmem_zalloc(hsize * sizeof (void*), KM_SLEEP);
|
|
#else
|
|
buf_hash_table.ht_table =
|
|
kmem_zalloc(hsize * sizeof (void*), KM_NOSLEEP);
|
|
#endif
|
|
if (buf_hash_table.ht_table == NULL) {
|
|
ASSERT(hsize > (1ULL << 8));
|
|
hsize >>= 1;
|
|
goto retry;
|
|
}
|
|
|
|
hdr_full_cache = kmem_cache_create("arc_buf_hdr_t_full", HDR_FULL_SIZE,
|
|
0, hdr_full_cons, hdr_full_dest, hdr_recl, NULL, NULL, 0);
|
|
hdr_l2only_cache = kmem_cache_create("arc_buf_hdr_t_l2only",
|
|
HDR_L2ONLY_SIZE, 0, hdr_l2only_cons, hdr_l2only_dest, hdr_recl,
|
|
NULL, NULL, 0);
|
|
buf_cache = kmem_cache_create("arc_buf_t", sizeof (arc_buf_t),
|
|
0, buf_cons, buf_dest, NULL, NULL, NULL, 0);
|
|
|
|
for (i = 0; i < 256; i++)
|
|
for (ct = zfs_crc64_table + i, *ct = i, j = 8; j > 0; j--)
|
|
*ct = (*ct >> 1) ^ (-(*ct & 1) & ZFS_CRC64_POLY);
|
|
|
|
for (i = 0; i < BUF_LOCKS; i++) {
|
|
mutex_init(&buf_hash_table.ht_locks[i].ht_lock,
|
|
NULL, MUTEX_DEFAULT, NULL);
|
|
}
|
|
}
|
|
|
|
#define ARC_MINTIME (hz>>4) /* 62 ms */
|
|
|
|
/*
|
|
* This is the size that the buf occupies in memory. If the buf is compressed,
|
|
* it will correspond to the compressed size. You should use this method of
|
|
* getting the buf size unless you explicitly need the logical size.
|
|
*/
|
|
uint64_t
|
|
arc_buf_size(arc_buf_t *buf)
|
|
{
|
|
return (ARC_BUF_COMPRESSED(buf) ?
|
|
HDR_GET_PSIZE(buf->b_hdr) : HDR_GET_LSIZE(buf->b_hdr));
|
|
}
|
|
|
|
uint64_t
|
|
arc_buf_lsize(arc_buf_t *buf)
|
|
{
|
|
return (HDR_GET_LSIZE(buf->b_hdr));
|
|
}
|
|
|
|
enum zio_compress
|
|
arc_get_compression(arc_buf_t *buf)
|
|
{
|
|
return (ARC_BUF_COMPRESSED(buf) ?
|
|
HDR_GET_COMPRESS(buf->b_hdr) : ZIO_COMPRESS_OFF);
|
|
}
|
|
|
|
static inline boolean_t
|
|
arc_buf_is_shared(arc_buf_t *buf)
|
|
{
|
|
boolean_t shared = (buf->b_data != NULL &&
|
|
buf->b_hdr->b_l1hdr.b_pabd != NULL &&
|
|
abd_is_linear(buf->b_hdr->b_l1hdr.b_pabd) &&
|
|
buf->b_data == abd_to_buf(buf->b_hdr->b_l1hdr.b_pabd));
|
|
IMPLY(shared, HDR_SHARED_DATA(buf->b_hdr));
|
|
IMPLY(shared, ARC_BUF_SHARED(buf));
|
|
IMPLY(shared, ARC_BUF_COMPRESSED(buf) || ARC_BUF_LAST(buf));
|
|
|
|
/*
|
|
* It would be nice to assert arc_can_share() too, but the "hdr isn't
|
|
* already being shared" requirement prevents us from doing that.
|
|
*/
|
|
|
|
return (shared);
|
|
}
|
|
|
|
/*
|
|
* Free the checksum associated with this header. If there is no checksum, this
|
|
* is a no-op.
|
|
*/
|
|
static inline void
|
|
arc_cksum_free(arc_buf_hdr_t *hdr)
|
|
{
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
mutex_enter(&hdr->b_l1hdr.b_freeze_lock);
|
|
if (hdr->b_l1hdr.b_freeze_cksum != NULL) {
|
|
kmem_free(hdr->b_l1hdr.b_freeze_cksum, sizeof (zio_cksum_t));
|
|
hdr->b_l1hdr.b_freeze_cksum = NULL;
|
|
}
|
|
mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
|
|
}
|
|
|
|
/*
|
|
* Return true iff at least one of the bufs on hdr is not compressed.
|
|
*/
|
|
static boolean_t
|
|
arc_hdr_has_uncompressed_buf(arc_buf_hdr_t *hdr)
|
|
{
|
|
for (arc_buf_t *b = hdr->b_l1hdr.b_buf; b != NULL; b = b->b_next) {
|
|
if (!ARC_BUF_COMPRESSED(b)) {
|
|
return (B_TRUE);
|
|
}
|
|
}
|
|
return (B_FALSE);
|
|
}
|
|
|
|
|
|
/*
|
|
* If we've turned on the ZFS_DEBUG_MODIFY flag, verify that the buf's data
|
|
* matches the checksum that is stored in the hdr. If there is no checksum,
|
|
* or if the buf is compressed, this is a no-op.
|
|
*/
|
|
static void
|
|
arc_cksum_verify(arc_buf_t *buf)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
zio_cksum_t zc;
|
|
|
|
if (!(zfs_flags & ZFS_DEBUG_MODIFY))
|
|
return;
|
|
|
|
if (ARC_BUF_COMPRESSED(buf)) {
|
|
ASSERT(hdr->b_l1hdr.b_freeze_cksum == NULL ||
|
|
arc_hdr_has_uncompressed_buf(hdr));
|
|
return;
|
|
}
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
mutex_enter(&hdr->b_l1hdr.b_freeze_lock);
|
|
if (hdr->b_l1hdr.b_freeze_cksum == NULL || HDR_IO_ERROR(hdr)) {
|
|
mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
|
|
return;
|
|
}
|
|
|
|
fletcher_2_native(buf->b_data, arc_buf_size(buf), NULL, &zc);
|
|
if (!ZIO_CHECKSUM_EQUAL(*hdr->b_l1hdr.b_freeze_cksum, zc))
|
|
panic("buffer modified while frozen!");
|
|
mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
|
|
}
|
|
|
|
static boolean_t
|
|
arc_cksum_is_equal(arc_buf_hdr_t *hdr, zio_t *zio)
|
|
{
|
|
enum zio_compress compress = BP_GET_COMPRESS(zio->io_bp);
|
|
boolean_t valid_cksum;
|
|
|
|
ASSERT(!BP_IS_EMBEDDED(zio->io_bp));
|
|
VERIFY3U(BP_GET_PSIZE(zio->io_bp), ==, HDR_GET_PSIZE(hdr));
|
|
|
|
/*
|
|
* We rely on the blkptr's checksum to determine if the block
|
|
* is valid or not. When compressed arc is enabled, the l2arc
|
|
* writes the block to the l2arc just as it appears in the pool.
|
|
* This allows us to use the blkptr's checksum to validate the
|
|
* data that we just read off of the l2arc without having to store
|
|
* a separate checksum in the arc_buf_hdr_t. However, if compressed
|
|
* arc is disabled, then the data written to the l2arc is always
|
|
* uncompressed and won't match the block as it exists in the main
|
|
* pool. When this is the case, we must first compress it if it is
|
|
* compressed on the main pool before we can validate the checksum.
|
|
*/
|
|
if (!HDR_COMPRESSION_ENABLED(hdr) && compress != ZIO_COMPRESS_OFF) {
|
|
uint64_t lsize;
|
|
uint64_t csize;
|
|
void *cbuf;
|
|
ASSERT3U(HDR_GET_COMPRESS(hdr), ==, ZIO_COMPRESS_OFF);
|
|
|
|
cbuf = zio_buf_alloc(HDR_GET_PSIZE(hdr));
|
|
lsize = HDR_GET_LSIZE(hdr);
|
|
csize = zio_compress_data(compress, zio->io_abd, cbuf, lsize);
|
|
|
|
ASSERT3U(csize, <=, HDR_GET_PSIZE(hdr));
|
|
if (csize < HDR_GET_PSIZE(hdr)) {
|
|
/*
|
|
* Compressed blocks are always a multiple of the
|
|
* smallest ashift in the pool. Ideally, we would
|
|
* like to round up the csize to the next
|
|
* spa_min_ashift but that value may have changed
|
|
* since the block was last written. Instead,
|
|
* we rely on the fact that the hdr's psize
|
|
* was set to the psize of the block when it was
|
|
* last written. We set the csize to that value
|
|
* and zero out any part that should not contain
|
|
* data.
|
|
*/
|
|
bzero((char *)cbuf + csize, HDR_GET_PSIZE(hdr) - csize);
|
|
csize = HDR_GET_PSIZE(hdr);
|
|
}
|
|
zio_push_transform(zio, cbuf, csize, HDR_GET_PSIZE(hdr), NULL);
|
|
}
|
|
|
|
/*
|
|
* Block pointers always store the checksum for the logical data.
|
|
* If the block pointer has the gang bit set, then the checksum
|
|
* it represents is for the reconstituted data and not for an
|
|
* individual gang member. The zio pipeline, however, must be able to
|
|
* determine the checksum of each of the gang constituents so it
|
|
* treats the checksum comparison differently than what we need
|
|
* for l2arc blocks. This prevents us from using the
|
|
* zio_checksum_error() interface directly. Instead we must call the
|
|
* zio_checksum_error_impl() so that we can ensure the checksum is
|
|
* generated using the correct checksum algorithm and accounts for the
|
|
* logical I/O size and not just a gang fragment.
|
|
*/
|
|
valid_cksum = (zio_checksum_error_impl(zio->io_spa, zio->io_bp,
|
|
BP_GET_CHECKSUM(zio->io_bp), zio->io_abd, zio->io_size,
|
|
zio->io_offset, NULL) == 0);
|
|
zio_pop_transforms(zio);
|
|
return (valid_cksum);
|
|
}
|
|
|
|
/*
|
|
* Given a buf full of data, if ZFS_DEBUG_MODIFY is enabled this computes a
|
|
* checksum and attaches it to the buf's hdr so that we can ensure that the buf
|
|
* isn't modified later on. If buf is compressed or there is already a checksum
|
|
* on the hdr, this is a no-op (we only checksum uncompressed bufs).
|
|
*/
|
|
static void
|
|
arc_cksum_compute(arc_buf_t *buf)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
|
|
if (!(zfs_flags & ZFS_DEBUG_MODIFY))
|
|
return;
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
mutex_enter(&buf->b_hdr->b_l1hdr.b_freeze_lock);
|
|
if (hdr->b_l1hdr.b_freeze_cksum != NULL) {
|
|
ASSERT(arc_hdr_has_uncompressed_buf(hdr));
|
|
mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
|
|
return;
|
|
} else if (ARC_BUF_COMPRESSED(buf)) {
|
|
mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
|
|
return;
|
|
}
|
|
|
|
ASSERT(!ARC_BUF_COMPRESSED(buf));
|
|
hdr->b_l1hdr.b_freeze_cksum = kmem_alloc(sizeof (zio_cksum_t),
|
|
KM_SLEEP);
|
|
fletcher_2_native(buf->b_data, arc_buf_size(buf), NULL,
|
|
hdr->b_l1hdr.b_freeze_cksum);
|
|
mutex_exit(&hdr->b_l1hdr.b_freeze_lock);
|
|
arc_buf_watch(buf);
|
|
}
|
|
|
|
#ifndef _KERNEL
|
|
void
|
|
arc_buf_sigsegv(int sig, siginfo_t *si, void *unused)
|
|
{
|
|
panic("Got SIGSEGV at address: 0x%lx\n", (long)si->si_addr);
|
|
}
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
arc_buf_unwatch(arc_buf_t *buf)
|
|
{
|
|
#ifndef _KERNEL
|
|
if (arc_watch) {
|
|
ASSERT0(mprotect(buf->b_data, arc_buf_size(buf),
|
|
PROT_READ | PROT_WRITE));
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
arc_buf_watch(arc_buf_t *buf)
|
|
{
|
|
#ifndef _KERNEL
|
|
if (arc_watch)
|
|
ASSERT0(mprotect(buf->b_data, arc_buf_size(buf),
|
|
PROT_READ));
|
|
#endif
|
|
}
|
|
|
|
static arc_buf_contents_t
|
|
arc_buf_type(arc_buf_hdr_t *hdr)
|
|
{
|
|
arc_buf_contents_t type;
|
|
if (HDR_ISTYPE_METADATA(hdr)) {
|
|
type = ARC_BUFC_METADATA;
|
|
} else {
|
|
type = ARC_BUFC_DATA;
|
|
}
|
|
VERIFY3U(hdr->b_type, ==, type);
|
|
return (type);
|
|
}
|
|
|
|
boolean_t
|
|
arc_is_metadata(arc_buf_t *buf)
|
|
{
|
|
return (HDR_ISTYPE_METADATA(buf->b_hdr) != 0);
|
|
}
|
|
|
|
static uint32_t
|
|
arc_bufc_to_flags(arc_buf_contents_t type)
|
|
{
|
|
switch (type) {
|
|
case ARC_BUFC_DATA:
|
|
/* metadata field is 0 if buffer contains normal data */
|
|
return (0);
|
|
case ARC_BUFC_METADATA:
|
|
return (ARC_FLAG_BUFC_METADATA);
|
|
default:
|
|
break;
|
|
}
|
|
panic("undefined ARC buffer type!");
|
|
return ((uint32_t)-1);
|
|
}
|
|
|
|
void
|
|
arc_buf_thaw(arc_buf_t *buf)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
|
|
ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
|
|
ASSERT(!HDR_IO_IN_PROGRESS(hdr));
|
|
|
|
arc_cksum_verify(buf);
|
|
|
|
/*
|
|
* Compressed buffers do not manipulate the b_freeze_cksum or
|
|
* allocate b_thawed.
|
|
*/
|
|
if (ARC_BUF_COMPRESSED(buf)) {
|
|
ASSERT(hdr->b_l1hdr.b_freeze_cksum == NULL ||
|
|
arc_hdr_has_uncompressed_buf(hdr));
|
|
return;
|
|
}
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
arc_cksum_free(hdr);
|
|
arc_buf_unwatch(buf);
|
|
}
|
|
|
|
void
|
|
arc_buf_freeze(arc_buf_t *buf)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
kmutex_t *hash_lock;
|
|
|
|
if (!(zfs_flags & ZFS_DEBUG_MODIFY))
|
|
return;
|
|
|
|
if (ARC_BUF_COMPRESSED(buf)) {
|
|
ASSERT(hdr->b_l1hdr.b_freeze_cksum == NULL ||
|
|
arc_hdr_has_uncompressed_buf(hdr));
|
|
return;
|
|
}
|
|
|
|
hash_lock = HDR_LOCK(hdr);
|
|
mutex_enter(hash_lock);
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
ASSERT(hdr->b_l1hdr.b_freeze_cksum != NULL ||
|
|
hdr->b_l1hdr.b_state == arc_anon);
|
|
arc_cksum_compute(buf);
|
|
mutex_exit(hash_lock);
|
|
}
|
|
|
|
/*
|
|
* The arc_buf_hdr_t's b_flags should never be modified directly. Instead,
|
|
* the following functions should be used to ensure that the flags are
|
|
* updated in a thread-safe way. When manipulating the flags either
|
|
* the hash_lock must be held or the hdr must be undiscoverable. This
|
|
* ensures that we're not racing with any other threads when updating
|
|
* the flags.
|
|
*/
|
|
static inline void
|
|
arc_hdr_set_flags(arc_buf_hdr_t *hdr, arc_flags_t flags)
|
|
{
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)) || HDR_EMPTY(hdr));
|
|
hdr->b_flags |= flags;
|
|
}
|
|
|
|
static inline void
|
|
arc_hdr_clear_flags(arc_buf_hdr_t *hdr, arc_flags_t flags)
|
|
{
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)) || HDR_EMPTY(hdr));
|
|
hdr->b_flags &= ~flags;
|
|
}
|
|
|
|
/*
|
|
* Setting the compression bits in the arc_buf_hdr_t's b_flags is
|
|
* done in a special way since we have to clear and set bits
|
|
* at the same time. Consumers that wish to set the compression bits
|
|
* must use this function to ensure that the flags are updated in
|
|
* thread-safe manner.
|
|
*/
|
|
static void
|
|
arc_hdr_set_compress(arc_buf_hdr_t *hdr, enum zio_compress cmp)
|
|
{
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)) || HDR_EMPTY(hdr));
|
|
|
|
/*
|
|
* Holes and embedded blocks will always have a psize = 0 so
|
|
* we ignore the compression of the blkptr and set the
|
|
* want to uncompress them. Mark them as uncompressed.
|
|
*/
|
|
if (!zfs_compressed_arc_enabled || HDR_GET_PSIZE(hdr) == 0) {
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_COMPRESSED_ARC);
|
|
HDR_SET_COMPRESS(hdr, ZIO_COMPRESS_OFF);
|
|
ASSERT(!HDR_COMPRESSION_ENABLED(hdr));
|
|
ASSERT3U(HDR_GET_COMPRESS(hdr), ==, ZIO_COMPRESS_OFF);
|
|
} else {
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_COMPRESSED_ARC);
|
|
HDR_SET_COMPRESS(hdr, cmp);
|
|
ASSERT3U(HDR_GET_COMPRESS(hdr), ==, cmp);
|
|
ASSERT(HDR_COMPRESSION_ENABLED(hdr));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Looks for another buf on the same hdr which has the data decompressed, copies
|
|
* from it, and returns true. If no such buf exists, returns false.
|
|
*/
|
|
static boolean_t
|
|
arc_buf_try_copy_decompressed_data(arc_buf_t *buf)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
boolean_t copied = B_FALSE;
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
ASSERT3P(buf->b_data, !=, NULL);
|
|
ASSERT(!ARC_BUF_COMPRESSED(buf));
|
|
|
|
for (arc_buf_t *from = hdr->b_l1hdr.b_buf; from != NULL;
|
|
from = from->b_next) {
|
|
/* can't use our own data buffer */
|
|
if (from == buf) {
|
|
continue;
|
|
}
|
|
|
|
if (!ARC_BUF_COMPRESSED(from)) {
|
|
bcopy(from->b_data, buf->b_data, arc_buf_size(buf));
|
|
copied = B_TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* There were no decompressed bufs, so there should not be a
|
|
* checksum on the hdr either.
|
|
*/
|
|
EQUIV(!copied, hdr->b_l1hdr.b_freeze_cksum == NULL);
|
|
|
|
return (copied);
|
|
}
|
|
|
|
/*
|
|
* Given a buf that has a data buffer attached to it, this function will
|
|
* efficiently fill the buf with data of the specified compression setting from
|
|
* the hdr and update the hdr's b_freeze_cksum if necessary. If the buf and hdr
|
|
* are already sharing a data buf, no copy is performed.
|
|
*
|
|
* If the buf is marked as compressed but uncompressed data was requested, this
|
|
* will allocate a new data buffer for the buf, remove that flag, and fill the
|
|
* buf with uncompressed data. You can't request a compressed buf on a hdr with
|
|
* uncompressed data, and (since we haven't added support for it yet) if you
|
|
* want compressed data your buf must already be marked as compressed and have
|
|
* the correct-sized data buffer.
|
|
*/
|
|
static int
|
|
arc_buf_fill(arc_buf_t *buf, boolean_t compressed)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
boolean_t hdr_compressed = (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF);
|
|
dmu_object_byteswap_t bswap = hdr->b_l1hdr.b_byteswap;
|
|
|
|
ASSERT3P(buf->b_data, !=, NULL);
|
|
IMPLY(compressed, hdr_compressed);
|
|
IMPLY(compressed, ARC_BUF_COMPRESSED(buf));
|
|
|
|
if (hdr_compressed == compressed) {
|
|
if (!arc_buf_is_shared(buf)) {
|
|
abd_copy_to_buf(buf->b_data, hdr->b_l1hdr.b_pabd,
|
|
arc_buf_size(buf));
|
|
}
|
|
} else {
|
|
ASSERT(hdr_compressed);
|
|
ASSERT(!compressed);
|
|
ASSERT3U(HDR_GET_LSIZE(hdr), !=, HDR_GET_PSIZE(hdr));
|
|
|
|
/*
|
|
* If the buf is sharing its data with the hdr, unlink it and
|
|
* allocate a new data buffer for the buf.
|
|
*/
|
|
if (arc_buf_is_shared(buf)) {
|
|
ASSERT(ARC_BUF_COMPRESSED(buf));
|
|
|
|
/* We need to give the buf it's own b_data */
|
|
buf->b_flags &= ~ARC_BUF_FLAG_SHARED;
|
|
buf->b_data =
|
|
arc_get_data_buf(hdr, HDR_GET_LSIZE(hdr), buf);
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_SHARED_DATA);
|
|
|
|
/* Previously overhead was 0; just add new overhead */
|
|
ARCSTAT_INCR(arcstat_overhead_size, HDR_GET_LSIZE(hdr));
|
|
} else if (ARC_BUF_COMPRESSED(buf)) {
|
|
/* We need to reallocate the buf's b_data */
|
|
arc_free_data_buf(hdr, buf->b_data, HDR_GET_PSIZE(hdr),
|
|
buf);
|
|
buf->b_data =
|
|
arc_get_data_buf(hdr, HDR_GET_LSIZE(hdr), buf);
|
|
|
|
/* We increased the size of b_data; update overhead */
|
|
ARCSTAT_INCR(arcstat_overhead_size,
|
|
HDR_GET_LSIZE(hdr) - HDR_GET_PSIZE(hdr));
|
|
}
|
|
|
|
/*
|
|
* Regardless of the buf's previous compression settings, it
|
|
* should not be compressed at the end of this function.
|
|
*/
|
|
buf->b_flags &= ~ARC_BUF_FLAG_COMPRESSED;
|
|
|
|
/*
|
|
* Try copying the data from another buf which already has a
|
|
* decompressed version. If that's not possible, it's time to
|
|
* bite the bullet and decompress the data from the hdr.
|
|
*/
|
|
if (arc_buf_try_copy_decompressed_data(buf)) {
|
|
/* Skip byteswapping and checksumming (already done) */
|
|
ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, !=, NULL);
|
|
return (0);
|
|
} else {
|
|
int error = zio_decompress_data(HDR_GET_COMPRESS(hdr),
|
|
hdr->b_l1hdr.b_pabd, buf->b_data,
|
|
HDR_GET_PSIZE(hdr), HDR_GET_LSIZE(hdr));
|
|
|
|
/*
|
|
* Absent hardware errors or software bugs, this should
|
|
* be impossible, but log it anyway so we can debug it.
|
|
*/
|
|
if (error != 0) {
|
|
zfs_dbgmsg(
|
|
"hdr %p, compress %d, psize %d, lsize %d",
|
|
hdr, HDR_GET_COMPRESS(hdr),
|
|
HDR_GET_PSIZE(hdr), HDR_GET_LSIZE(hdr));
|
|
return (SET_ERROR(EIO));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Byteswap the buf's data if necessary */
|
|
if (bswap != DMU_BSWAP_NUMFUNCS) {
|
|
ASSERT(!HDR_SHARED_DATA(hdr));
|
|
ASSERT3U(bswap, <, DMU_BSWAP_NUMFUNCS);
|
|
dmu_ot_byteswap[bswap].ob_func(buf->b_data, HDR_GET_LSIZE(hdr));
|
|
}
|
|
|
|
/* Compute the hdr's checksum if necessary */
|
|
arc_cksum_compute(buf);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
arc_decompress(arc_buf_t *buf)
|
|
{
|
|
return (arc_buf_fill(buf, B_FALSE));
|
|
}
|
|
|
|
/*
|
|
* Return the size of the block, b_pabd, that is stored in the arc_buf_hdr_t.
|
|
*/
|
|
static uint64_t
|
|
arc_hdr_size(arc_buf_hdr_t *hdr)
|
|
{
|
|
uint64_t size;
|
|
|
|
if (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF &&
|
|
HDR_GET_PSIZE(hdr) > 0) {
|
|
size = HDR_GET_PSIZE(hdr);
|
|
} else {
|
|
ASSERT3U(HDR_GET_LSIZE(hdr), !=, 0);
|
|
size = HDR_GET_LSIZE(hdr);
|
|
}
|
|
return (size);
|
|
}
|
|
|
|
/*
|
|
* Increment the amount of evictable space in the arc_state_t's refcount.
|
|
* We account for the space used by the hdr and the arc buf individually
|
|
* so that we can add and remove them from the refcount individually.
|
|
*/
|
|
static void
|
|
arc_evictable_space_increment(arc_buf_hdr_t *hdr, arc_state_t *state)
|
|
{
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
arc_buf_t *buf;
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
if (GHOST_STATE(state)) {
|
|
ASSERT0(hdr->b_l1hdr.b_bufcnt);
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
(void) refcount_add_many(&state->arcs_esize[type],
|
|
HDR_GET_LSIZE(hdr), hdr);
|
|
return;
|
|
}
|
|
|
|
ASSERT(!GHOST_STATE(state));
|
|
if (hdr->b_l1hdr.b_pabd != NULL) {
|
|
(void) refcount_add_many(&state->arcs_esize[type],
|
|
arc_hdr_size(hdr), hdr);
|
|
}
|
|
for (buf = hdr->b_l1hdr.b_buf; buf != NULL; buf = buf->b_next) {
|
|
if (arc_buf_is_shared(buf))
|
|
continue;
|
|
(void) refcount_add_many(&state->arcs_esize[type],
|
|
arc_buf_size(buf), buf);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Decrement the amount of evictable space in the arc_state_t's refcount.
|
|
* We account for the space used by the hdr and the arc buf individually
|
|
* so that we can add and remove them from the refcount individually.
|
|
*/
|
|
static void
|
|
arc_evictable_space_decrement(arc_buf_hdr_t *hdr, arc_state_t *state)
|
|
{
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
arc_buf_t *buf;
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
if (GHOST_STATE(state)) {
|
|
ASSERT0(hdr->b_l1hdr.b_bufcnt);
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
(void) refcount_remove_many(&state->arcs_esize[type],
|
|
HDR_GET_LSIZE(hdr), hdr);
|
|
return;
|
|
}
|
|
|
|
ASSERT(!GHOST_STATE(state));
|
|
if (hdr->b_l1hdr.b_pabd != NULL) {
|
|
(void) refcount_remove_many(&state->arcs_esize[type],
|
|
arc_hdr_size(hdr), hdr);
|
|
}
|
|
for (buf = hdr->b_l1hdr.b_buf; buf != NULL; buf = buf->b_next) {
|
|
if (arc_buf_is_shared(buf))
|
|
continue;
|
|
(void) refcount_remove_many(&state->arcs_esize[type],
|
|
arc_buf_size(buf), buf);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add a reference to this hdr indicating that someone is actively
|
|
* referencing that memory. When the refcount transitions from 0 to 1,
|
|
* we remove it from the respective arc_state_t list to indicate that
|
|
* it is not evictable.
|
|
*/
|
|
static void
|
|
add_reference(arc_buf_hdr_t *hdr, void *tag)
|
|
{
|
|
arc_state_t *state;
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
if (!MUTEX_HELD(HDR_LOCK(hdr))) {
|
|
ASSERT(hdr->b_l1hdr.b_state == arc_anon);
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
|
|
}
|
|
|
|
state = hdr->b_l1hdr.b_state;
|
|
|
|
if ((refcount_add(&hdr->b_l1hdr.b_refcnt, tag) == 1) &&
|
|
(state != arc_anon)) {
|
|
/* We don't use the L2-only state list. */
|
|
if (state != arc_l2c_only) {
|
|
multilist_remove(state->arcs_list[arc_buf_type(hdr)],
|
|
hdr);
|
|
arc_evictable_space_decrement(hdr, state);
|
|
}
|
|
/* remove the prefetch flag if we get a reference */
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_PREFETCH);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove a reference from this hdr. When the reference transitions from
|
|
* 1 to 0 and we're not anonymous, then we add this hdr to the arc_state_t's
|
|
* list making it eligible for eviction.
|
|
*/
|
|
static int
|
|
remove_reference(arc_buf_hdr_t *hdr, kmutex_t *hash_lock, void *tag)
|
|
{
|
|
int cnt;
|
|
arc_state_t *state = hdr->b_l1hdr.b_state;
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
ASSERT(state == arc_anon || MUTEX_HELD(hash_lock));
|
|
ASSERT(!GHOST_STATE(state));
|
|
|
|
/*
|
|
* arc_l2c_only counts as a ghost state so we don't need to explicitly
|
|
* check to prevent usage of the arc_l2c_only list.
|
|
*/
|
|
if (((cnt = refcount_remove(&hdr->b_l1hdr.b_refcnt, tag)) == 0) &&
|
|
(state != arc_anon)) {
|
|
multilist_insert(state->arcs_list[arc_buf_type(hdr)], hdr);
|
|
ASSERT3U(hdr->b_l1hdr.b_bufcnt, >, 0);
|
|
arc_evictable_space_increment(hdr, state);
|
|
}
|
|
return (cnt);
|
|
}
|
|
|
|
/*
|
|
* Returns detailed information about a specific arc buffer. When the
|
|
* state_index argument is set the function will calculate the arc header
|
|
* list position for its arc state. Since this requires a linear traversal
|
|
* callers are strongly encourage not to do this. However, it can be helpful
|
|
* for targeted analysis so the functionality is provided.
|
|
*/
|
|
void
|
|
arc_buf_info(arc_buf_t *ab, arc_buf_info_t *abi, int state_index)
|
|
{
|
|
arc_buf_hdr_t *hdr = ab->b_hdr;
|
|
l1arc_buf_hdr_t *l1hdr = NULL;
|
|
l2arc_buf_hdr_t *l2hdr = NULL;
|
|
arc_state_t *state = NULL;
|
|
|
|
memset(abi, 0, sizeof (arc_buf_info_t));
|
|
|
|
if (hdr == NULL)
|
|
return;
|
|
|
|
abi->abi_flags = hdr->b_flags;
|
|
|
|
if (HDR_HAS_L1HDR(hdr)) {
|
|
l1hdr = &hdr->b_l1hdr;
|
|
state = l1hdr->b_state;
|
|
}
|
|
if (HDR_HAS_L2HDR(hdr))
|
|
l2hdr = &hdr->b_l2hdr;
|
|
|
|
if (l1hdr) {
|
|
abi->abi_bufcnt = l1hdr->b_bufcnt;
|
|
abi->abi_access = l1hdr->b_arc_access;
|
|
abi->abi_mru_hits = l1hdr->b_mru_hits;
|
|
abi->abi_mru_ghost_hits = l1hdr->b_mru_ghost_hits;
|
|
abi->abi_mfu_hits = l1hdr->b_mfu_hits;
|
|
abi->abi_mfu_ghost_hits = l1hdr->b_mfu_ghost_hits;
|
|
abi->abi_holds = refcount_count(&l1hdr->b_refcnt);
|
|
}
|
|
|
|
if (l2hdr) {
|
|
abi->abi_l2arc_dattr = l2hdr->b_daddr;
|
|
abi->abi_l2arc_hits = l2hdr->b_hits;
|
|
}
|
|
|
|
abi->abi_state_type = state ? state->arcs_state : ARC_STATE_ANON;
|
|
abi->abi_state_contents = arc_buf_type(hdr);
|
|
abi->abi_size = arc_hdr_size(hdr);
|
|
}
|
|
|
|
/*
|
|
* Move the supplied buffer to the indicated state. The hash lock
|
|
* for the buffer must be held by the caller.
|
|
*/
|
|
static void
|
|
arc_change_state(arc_state_t *new_state, arc_buf_hdr_t *hdr,
|
|
kmutex_t *hash_lock)
|
|
{
|
|
arc_state_t *old_state;
|
|
int64_t refcnt;
|
|
uint32_t bufcnt;
|
|
boolean_t update_old, update_new;
|
|
arc_buf_contents_t buftype = arc_buf_type(hdr);
|
|
|
|
/*
|
|
* We almost always have an L1 hdr here, since we call arc_hdr_realloc()
|
|
* in arc_read() when bringing a buffer out of the L2ARC. However, the
|
|
* L1 hdr doesn't always exist when we change state to arc_anon before
|
|
* destroying a header, in which case reallocating to add the L1 hdr is
|
|
* pointless.
|
|
*/
|
|
if (HDR_HAS_L1HDR(hdr)) {
|
|
old_state = hdr->b_l1hdr.b_state;
|
|
refcnt = refcount_count(&hdr->b_l1hdr.b_refcnt);
|
|
bufcnt = hdr->b_l1hdr.b_bufcnt;
|
|
update_old = (bufcnt > 0 || hdr->b_l1hdr.b_pabd != NULL);
|
|
} else {
|
|
old_state = arc_l2c_only;
|
|
refcnt = 0;
|
|
bufcnt = 0;
|
|
update_old = B_FALSE;
|
|
}
|
|
update_new = update_old;
|
|
|
|
ASSERT(MUTEX_HELD(hash_lock));
|
|
ASSERT3P(new_state, !=, old_state);
|
|
ASSERT(!GHOST_STATE(new_state) || bufcnt == 0);
|
|
ASSERT(old_state != arc_anon || bufcnt <= 1);
|
|
|
|
/*
|
|
* If this buffer is evictable, transfer it from the
|
|
* old state list to the new state list.
|
|
*/
|
|
if (refcnt == 0) {
|
|
if (old_state != arc_anon && old_state != arc_l2c_only) {
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
multilist_remove(old_state->arcs_list[buftype], hdr);
|
|
|
|
if (GHOST_STATE(old_state)) {
|
|
ASSERT0(bufcnt);
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
|
|
update_old = B_TRUE;
|
|
}
|
|
arc_evictable_space_decrement(hdr, old_state);
|
|
}
|
|
if (new_state != arc_anon && new_state != arc_l2c_only) {
|
|
/*
|
|
* An L1 header always exists here, since if we're
|
|
* moving to some L1-cached state (i.e. not l2c_only or
|
|
* anonymous), we realloc the header to add an L1hdr
|
|
* beforehand.
|
|
*/
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
multilist_insert(new_state->arcs_list[buftype], hdr);
|
|
|
|
if (GHOST_STATE(new_state)) {
|
|
ASSERT0(bufcnt);
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
|
|
update_new = B_TRUE;
|
|
}
|
|
arc_evictable_space_increment(hdr, new_state);
|
|
}
|
|
}
|
|
|
|
ASSERT(!HDR_EMPTY(hdr));
|
|
if (new_state == arc_anon && HDR_IN_HASH_TABLE(hdr))
|
|
buf_hash_remove(hdr);
|
|
|
|
/* adjust state sizes (ignore arc_l2c_only) */
|
|
|
|
if (update_new && new_state != arc_l2c_only) {
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
if (GHOST_STATE(new_state)) {
|
|
ASSERT0(bufcnt);
|
|
|
|
/*
|
|
* When moving a header to a ghost state, we first
|
|
* remove all arc buffers. Thus, we'll have a
|
|
* bufcnt of zero, and no arc buffer to use for
|
|
* the reference. As a result, we use the arc
|
|
* header pointer for the reference.
|
|
*/
|
|
(void) refcount_add_many(&new_state->arcs_size,
|
|
HDR_GET_LSIZE(hdr), hdr);
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
} else {
|
|
arc_buf_t *buf;
|
|
uint32_t buffers = 0;
|
|
|
|
/*
|
|
* Each individual buffer holds a unique reference,
|
|
* thus we must remove each of these references one
|
|
* at a time.
|
|
*/
|
|
for (buf = hdr->b_l1hdr.b_buf; buf != NULL;
|
|
buf = buf->b_next) {
|
|
ASSERT3U(bufcnt, !=, 0);
|
|
buffers++;
|
|
|
|
/*
|
|
* When the arc_buf_t is sharing the data
|
|
* block with the hdr, the owner of the
|
|
* reference belongs to the hdr. Only
|
|
* add to the refcount if the arc_buf_t is
|
|
* not shared.
|
|
*/
|
|
if (arc_buf_is_shared(buf))
|
|
continue;
|
|
|
|
(void) refcount_add_many(&new_state->arcs_size,
|
|
arc_buf_size(buf), buf);
|
|
}
|
|
ASSERT3U(bufcnt, ==, buffers);
|
|
|
|
if (hdr->b_l1hdr.b_pabd != NULL) {
|
|
(void) refcount_add_many(&new_state->arcs_size,
|
|
arc_hdr_size(hdr), hdr);
|
|
} else {
|
|
ASSERT(GHOST_STATE(old_state));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (update_old && old_state != arc_l2c_only) {
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
if (GHOST_STATE(old_state)) {
|
|
ASSERT0(bufcnt);
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
|
|
/*
|
|
* When moving a header off of a ghost state,
|
|
* the header will not contain any arc buffers.
|
|
* We use the arc header pointer for the reference
|
|
* which is exactly what we did when we put the
|
|
* header on the ghost state.
|
|
*/
|
|
|
|
(void) refcount_remove_many(&old_state->arcs_size,
|
|
HDR_GET_LSIZE(hdr), hdr);
|
|
} else {
|
|
arc_buf_t *buf;
|
|
uint32_t buffers = 0;
|
|
|
|
/*
|
|
* Each individual buffer holds a unique reference,
|
|
* thus we must remove each of these references one
|
|
* at a time.
|
|
*/
|
|
for (buf = hdr->b_l1hdr.b_buf; buf != NULL;
|
|
buf = buf->b_next) {
|
|
ASSERT3U(bufcnt, !=, 0);
|
|
buffers++;
|
|
|
|
/*
|
|
* When the arc_buf_t is sharing the data
|
|
* block with the hdr, the owner of the
|
|
* reference belongs to the hdr. Only
|
|
* add to the refcount if the arc_buf_t is
|
|
* not shared.
|
|
*/
|
|
if (arc_buf_is_shared(buf))
|
|
continue;
|
|
|
|
(void) refcount_remove_many(
|
|
&old_state->arcs_size, arc_buf_size(buf),
|
|
buf);
|
|
}
|
|
ASSERT3U(bufcnt, ==, buffers);
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
(void) refcount_remove_many(
|
|
&old_state->arcs_size, arc_hdr_size(hdr), hdr);
|
|
}
|
|
}
|
|
|
|
if (HDR_HAS_L1HDR(hdr))
|
|
hdr->b_l1hdr.b_state = new_state;
|
|
|
|
/*
|
|
* L2 headers should never be on the L2 state list since they don't
|
|
* have L1 headers allocated.
|
|
*/
|
|
ASSERT(multilist_is_empty(arc_l2c_only->arcs_list[ARC_BUFC_DATA]) &&
|
|
multilist_is_empty(arc_l2c_only->arcs_list[ARC_BUFC_METADATA]));
|
|
}
|
|
|
|
void
|
|
arc_space_consume(uint64_t space, arc_space_type_t type)
|
|
{
|
|
ASSERT(type >= 0 && type < ARC_SPACE_NUMTYPES);
|
|
|
|
switch (type) {
|
|
default:
|
|
break;
|
|
case ARC_SPACE_DATA:
|
|
ARCSTAT_INCR(arcstat_data_size, space);
|
|
break;
|
|
case ARC_SPACE_META:
|
|
ARCSTAT_INCR(arcstat_metadata_size, space);
|
|
break;
|
|
case ARC_SPACE_BONUS:
|
|
ARCSTAT_INCR(arcstat_bonus_size, space);
|
|
break;
|
|
case ARC_SPACE_DNODE:
|
|
ARCSTAT_INCR(arcstat_dnode_size, space);
|
|
break;
|
|
case ARC_SPACE_DBUF:
|
|
ARCSTAT_INCR(arcstat_dbuf_size, space);
|
|
break;
|
|
case ARC_SPACE_HDRS:
|
|
ARCSTAT_INCR(arcstat_hdr_size, space);
|
|
break;
|
|
case ARC_SPACE_L2HDRS:
|
|
ARCSTAT_INCR(arcstat_l2_hdr_size, space);
|
|
break;
|
|
}
|
|
|
|
if (type != ARC_SPACE_DATA)
|
|
ARCSTAT_INCR(arcstat_meta_used, space);
|
|
|
|
atomic_add_64(&arc_size, space);
|
|
}
|
|
|
|
void
|
|
arc_space_return(uint64_t space, arc_space_type_t type)
|
|
{
|
|
ASSERT(type >= 0 && type < ARC_SPACE_NUMTYPES);
|
|
|
|
switch (type) {
|
|
default:
|
|
break;
|
|
case ARC_SPACE_DATA:
|
|
ARCSTAT_INCR(arcstat_data_size, -space);
|
|
break;
|
|
case ARC_SPACE_META:
|
|
ARCSTAT_INCR(arcstat_metadata_size, -space);
|
|
break;
|
|
case ARC_SPACE_BONUS:
|
|
ARCSTAT_INCR(arcstat_bonus_size, -space);
|
|
break;
|
|
case ARC_SPACE_DNODE:
|
|
ARCSTAT_INCR(arcstat_dnode_size, -space);
|
|
break;
|
|
case ARC_SPACE_DBUF:
|
|
ARCSTAT_INCR(arcstat_dbuf_size, -space);
|
|
break;
|
|
case ARC_SPACE_HDRS:
|
|
ARCSTAT_INCR(arcstat_hdr_size, -space);
|
|
break;
|
|
case ARC_SPACE_L2HDRS:
|
|
ARCSTAT_INCR(arcstat_l2_hdr_size, -space);
|
|
break;
|
|
}
|
|
|
|
if (type != ARC_SPACE_DATA) {
|
|
ASSERT(arc_meta_used >= space);
|
|
if (arc_meta_max < arc_meta_used)
|
|
arc_meta_max = arc_meta_used;
|
|
ARCSTAT_INCR(arcstat_meta_used, -space);
|
|
}
|
|
|
|
ASSERT(arc_size >= space);
|
|
atomic_add_64(&arc_size, -space);
|
|
}
|
|
|
|
/*
|
|
* Given a hdr and a buf, returns whether that buf can share its b_data buffer
|
|
* with the hdr's b_pabd.
|
|
*/
|
|
static boolean_t
|
|
arc_can_share(arc_buf_hdr_t *hdr, arc_buf_t *buf)
|
|
{
|
|
/*
|
|
* The criteria for sharing a hdr's data are:
|
|
* 1. the hdr's compression matches the buf's compression
|
|
* 2. the hdr doesn't need to be byteswapped
|
|
* 3. the hdr isn't already being shared
|
|
* 4. the buf is either compressed or it is the last buf in the hdr list
|
|
*
|
|
* Criterion #4 maintains the invariant that shared uncompressed
|
|
* bufs must be the final buf in the hdr's b_buf list. Reading this, you
|
|
* might ask, "if a compressed buf is allocated first, won't that be the
|
|
* last thing in the list?", but in that case it's impossible to create
|
|
* a shared uncompressed buf anyway (because the hdr must be compressed
|
|
* to have the compressed buf). You might also think that #3 is
|
|
* sufficient to make this guarantee, however it's possible
|
|
* (specifically in the rare L2ARC write race mentioned in
|
|
* arc_buf_alloc_impl()) there will be an existing uncompressed buf that
|
|
* is sharable, but wasn't at the time of its allocation. Rather than
|
|
* allow a new shared uncompressed buf to be created and then shuffle
|
|
* the list around to make it the last element, this simply disallows
|
|
* sharing if the new buf isn't the first to be added.
|
|
*/
|
|
ASSERT3P(buf->b_hdr, ==, hdr);
|
|
boolean_t hdr_compressed = HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF;
|
|
boolean_t buf_compressed = ARC_BUF_COMPRESSED(buf) != 0;
|
|
return (buf_compressed == hdr_compressed &&
|
|
hdr->b_l1hdr.b_byteswap == DMU_BSWAP_NUMFUNCS &&
|
|
!HDR_SHARED_DATA(hdr) &&
|
|
(ARC_BUF_LAST(buf) || ARC_BUF_COMPRESSED(buf)));
|
|
}
|
|
|
|
/*
|
|
* Allocate a buf for this hdr. If you care about the data that's in the hdr,
|
|
* or if you want a compressed buffer, pass those flags in. Returns 0 if the
|
|
* copy was made successfully, or an error code otherwise.
|
|
*/
|
|
static int
|
|
arc_buf_alloc_impl(arc_buf_hdr_t *hdr, void *tag, boolean_t compressed,
|
|
boolean_t fill, arc_buf_t **ret)
|
|
{
|
|
arc_buf_t *buf;
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
ASSERT3U(HDR_GET_LSIZE(hdr), >, 0);
|
|
VERIFY(hdr->b_type == ARC_BUFC_DATA ||
|
|
hdr->b_type == ARC_BUFC_METADATA);
|
|
ASSERT3P(ret, !=, NULL);
|
|
ASSERT3P(*ret, ==, NULL);
|
|
|
|
hdr->b_l1hdr.b_mru_hits = 0;
|
|
hdr->b_l1hdr.b_mru_ghost_hits = 0;
|
|
hdr->b_l1hdr.b_mfu_hits = 0;
|
|
hdr->b_l1hdr.b_mfu_ghost_hits = 0;
|
|
hdr->b_l1hdr.b_l2_hits = 0;
|
|
|
|
buf = *ret = kmem_cache_alloc(buf_cache, KM_PUSHPAGE);
|
|
buf->b_hdr = hdr;
|
|
buf->b_data = NULL;
|
|
buf->b_next = hdr->b_l1hdr.b_buf;
|
|
buf->b_flags = 0;
|
|
|
|
add_reference(hdr, tag);
|
|
|
|
/*
|
|
* We're about to change the hdr's b_flags. We must either
|
|
* hold the hash_lock or be undiscoverable.
|
|
*/
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)) || HDR_EMPTY(hdr));
|
|
|
|
/*
|
|
* Only honor requests for compressed bufs if the hdr is actually
|
|
* compressed.
|
|
*/
|
|
if (compressed && HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF)
|
|
buf->b_flags |= ARC_BUF_FLAG_COMPRESSED;
|
|
|
|
/*
|
|
* If the hdr's data can be shared then we share the data buffer and
|
|
* set the appropriate bit in the hdr's b_flags to indicate the hdr is
|
|
* allocate a new buffer to store the buf's data.
|
|
*
|
|
* There are two additional restrictions here because we're sharing
|
|
* hdr -> buf instead of the usual buf -> hdr. First, the hdr can't be
|
|
* actively involved in an L2ARC write, because if this buf is used by
|
|
* an arc_write() then the hdr's data buffer will be released when the
|
|
* write completes, even though the L2ARC write might still be using it.
|
|
* Second, the hdr's ABD must be linear so that the buf's user doesn't
|
|
* need to be ABD-aware.
|
|
*/
|
|
boolean_t can_share = arc_can_share(hdr, buf) && !HDR_L2_WRITING(hdr) &&
|
|
abd_is_linear(hdr->b_l1hdr.b_pabd);
|
|
|
|
/* Set up b_data and sharing */
|
|
if (can_share) {
|
|
buf->b_data = abd_to_buf(hdr->b_l1hdr.b_pabd);
|
|
buf->b_flags |= ARC_BUF_FLAG_SHARED;
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_SHARED_DATA);
|
|
} else {
|
|
buf->b_data =
|
|
arc_get_data_buf(hdr, arc_buf_size(buf), buf);
|
|
ARCSTAT_INCR(arcstat_overhead_size, arc_buf_size(buf));
|
|
}
|
|
VERIFY3P(buf->b_data, !=, NULL);
|
|
|
|
hdr->b_l1hdr.b_buf = buf;
|
|
hdr->b_l1hdr.b_bufcnt += 1;
|
|
|
|
/*
|
|
* If the user wants the data from the hdr, we need to either copy or
|
|
* decompress the data.
|
|
*/
|
|
if (fill) {
|
|
return (arc_buf_fill(buf, ARC_BUF_COMPRESSED(buf) != 0));
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static char *arc_onloan_tag = "onloan";
|
|
|
|
static inline void
|
|
arc_loaned_bytes_update(int64_t delta)
|
|
{
|
|
atomic_add_64(&arc_loaned_bytes, delta);
|
|
|
|
/* assert that it did not wrap around */
|
|
ASSERT3S(atomic_add_64_nv(&arc_loaned_bytes, 0), >=, 0);
|
|
}
|
|
|
|
/*
|
|
* Loan out an anonymous arc buffer. Loaned buffers are not counted as in
|
|
* flight data by arc_tempreserve_space() until they are "returned". Loaned
|
|
* buffers must be returned to the arc before they can be used by the DMU or
|
|
* freed.
|
|
*/
|
|
arc_buf_t *
|
|
arc_loan_buf(spa_t *spa, boolean_t is_metadata, int size)
|
|
{
|
|
arc_buf_t *buf = arc_alloc_buf(spa, arc_onloan_tag,
|
|
is_metadata ? ARC_BUFC_METADATA : ARC_BUFC_DATA, size);
|
|
|
|
arc_loaned_bytes_update(size);
|
|
|
|
return (buf);
|
|
}
|
|
|
|
arc_buf_t *
|
|
arc_loan_compressed_buf(spa_t *spa, uint64_t psize, uint64_t lsize,
|
|
enum zio_compress compression_type)
|
|
{
|
|
arc_buf_t *buf = arc_alloc_compressed_buf(spa, arc_onloan_tag,
|
|
psize, lsize, compression_type);
|
|
|
|
arc_loaned_bytes_update(psize);
|
|
|
|
return (buf);
|
|
}
|
|
|
|
|
|
/*
|
|
* Return a loaned arc buffer to the arc.
|
|
*/
|
|
void
|
|
arc_return_buf(arc_buf_t *buf, void *tag)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
|
|
ASSERT3P(buf->b_data, !=, NULL);
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
(void) refcount_add(&hdr->b_l1hdr.b_refcnt, tag);
|
|
(void) refcount_remove(&hdr->b_l1hdr.b_refcnt, arc_onloan_tag);
|
|
|
|
arc_loaned_bytes_update(-arc_buf_size(buf));
|
|
}
|
|
|
|
/* Detach an arc_buf from a dbuf (tag) */
|
|
void
|
|
arc_loan_inuse_buf(arc_buf_t *buf, void *tag)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
|
|
ASSERT3P(buf->b_data, !=, NULL);
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
(void) refcount_add(&hdr->b_l1hdr.b_refcnt, arc_onloan_tag);
|
|
(void) refcount_remove(&hdr->b_l1hdr.b_refcnt, tag);
|
|
|
|
arc_loaned_bytes_update(arc_buf_size(buf));
|
|
}
|
|
|
|
static void
|
|
l2arc_free_abd_on_write(abd_t *abd, size_t size, arc_buf_contents_t type)
|
|
{
|
|
l2arc_data_free_t *df = kmem_alloc(sizeof (*df), KM_SLEEP);
|
|
|
|
df->l2df_abd = abd;
|
|
df->l2df_size = size;
|
|
df->l2df_type = type;
|
|
mutex_enter(&l2arc_free_on_write_mtx);
|
|
list_insert_head(l2arc_free_on_write, df);
|
|
mutex_exit(&l2arc_free_on_write_mtx);
|
|
}
|
|
|
|
static void
|
|
arc_hdr_free_on_write(arc_buf_hdr_t *hdr)
|
|
{
|
|
arc_state_t *state = hdr->b_l1hdr.b_state;
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
uint64_t size = arc_hdr_size(hdr);
|
|
|
|
/* protected by hash lock, if in the hash table */
|
|
if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
ASSERT(state != arc_anon && state != arc_l2c_only);
|
|
|
|
(void) refcount_remove_many(&state->arcs_esize[type],
|
|
size, hdr);
|
|
}
|
|
(void) refcount_remove_many(&state->arcs_size, size, hdr);
|
|
if (type == ARC_BUFC_METADATA) {
|
|
arc_space_return(size, ARC_SPACE_META);
|
|
} else {
|
|
ASSERT(type == ARC_BUFC_DATA);
|
|
arc_space_return(size, ARC_SPACE_DATA);
|
|
}
|
|
|
|
l2arc_free_abd_on_write(hdr->b_l1hdr.b_pabd, size, type);
|
|
}
|
|
|
|
/*
|
|
* Share the arc_buf_t's data with the hdr. Whenever we are sharing the
|
|
* data buffer, we transfer the refcount ownership to the hdr and update
|
|
* the appropriate kstats.
|
|
*/
|
|
static void
|
|
arc_share_buf(arc_buf_hdr_t *hdr, arc_buf_t *buf)
|
|
{
|
|
ASSERT(arc_can_share(hdr, buf));
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)) || HDR_EMPTY(hdr));
|
|
|
|
/*
|
|
* Start sharing the data buffer. We transfer the
|
|
* refcount ownership to the hdr since it always owns
|
|
* the refcount whenever an arc_buf_t is shared.
|
|
*/
|
|
refcount_transfer_ownership(&hdr->b_l1hdr.b_state->arcs_size, buf, hdr);
|
|
hdr->b_l1hdr.b_pabd = abd_get_from_buf(buf->b_data, arc_buf_size(buf));
|
|
abd_take_ownership_of_buf(hdr->b_l1hdr.b_pabd,
|
|
HDR_ISTYPE_METADATA(hdr));
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_SHARED_DATA);
|
|
buf->b_flags |= ARC_BUF_FLAG_SHARED;
|
|
|
|
/*
|
|
* Since we've transferred ownership to the hdr we need
|
|
* to increment its compressed and uncompressed kstats and
|
|
* decrement the overhead size.
|
|
*/
|
|
ARCSTAT_INCR(arcstat_compressed_size, arc_hdr_size(hdr));
|
|
ARCSTAT_INCR(arcstat_uncompressed_size, HDR_GET_LSIZE(hdr));
|
|
ARCSTAT_INCR(arcstat_overhead_size, -arc_buf_size(buf));
|
|
}
|
|
|
|
static void
|
|
arc_unshare_buf(arc_buf_hdr_t *hdr, arc_buf_t *buf)
|
|
{
|
|
ASSERT(arc_buf_is_shared(buf));
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)) || HDR_EMPTY(hdr));
|
|
|
|
/*
|
|
* We are no longer sharing this buffer so we need
|
|
* to transfer its ownership to the rightful owner.
|
|
*/
|
|
refcount_transfer_ownership(&hdr->b_l1hdr.b_state->arcs_size, hdr, buf);
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_SHARED_DATA);
|
|
abd_release_ownership_of_buf(hdr->b_l1hdr.b_pabd);
|
|
abd_put(hdr->b_l1hdr.b_pabd);
|
|
hdr->b_l1hdr.b_pabd = NULL;
|
|
buf->b_flags &= ~ARC_BUF_FLAG_SHARED;
|
|
|
|
/*
|
|
* Since the buffer is no longer shared between
|
|
* the arc buf and the hdr, count it as overhead.
|
|
*/
|
|
ARCSTAT_INCR(arcstat_compressed_size, -arc_hdr_size(hdr));
|
|
ARCSTAT_INCR(arcstat_uncompressed_size, -HDR_GET_LSIZE(hdr));
|
|
ARCSTAT_INCR(arcstat_overhead_size, arc_buf_size(buf));
|
|
}
|
|
|
|
/*
|
|
* Remove an arc_buf_t from the hdr's buf list and return the last
|
|
* arc_buf_t on the list. If no buffers remain on the list then return
|
|
* NULL.
|
|
*/
|
|
static arc_buf_t *
|
|
arc_buf_remove(arc_buf_hdr_t *hdr, arc_buf_t *buf)
|
|
{
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)) || HDR_EMPTY(hdr));
|
|
|
|
arc_buf_t **bufp = &hdr->b_l1hdr.b_buf;
|
|
arc_buf_t *lastbuf = NULL;
|
|
|
|
/*
|
|
* Remove the buf from the hdr list and locate the last
|
|
* remaining buffer on the list.
|
|
*/
|
|
while (*bufp != NULL) {
|
|
if (*bufp == buf)
|
|
*bufp = buf->b_next;
|
|
|
|
/*
|
|
* If we've removed a buffer in the middle of
|
|
* the list then update the lastbuf and update
|
|
* bufp.
|
|
*/
|
|
if (*bufp != NULL) {
|
|
lastbuf = *bufp;
|
|
bufp = &(*bufp)->b_next;
|
|
}
|
|
}
|
|
buf->b_next = NULL;
|
|
ASSERT3P(lastbuf, !=, buf);
|
|
IMPLY(hdr->b_l1hdr.b_bufcnt > 0, lastbuf != NULL);
|
|
IMPLY(hdr->b_l1hdr.b_bufcnt > 0, hdr->b_l1hdr.b_buf != NULL);
|
|
IMPLY(lastbuf != NULL, ARC_BUF_LAST(lastbuf));
|
|
|
|
return (lastbuf);
|
|
}
|
|
|
|
/*
|
|
* Free up buf->b_data and pull the arc_buf_t off of the the arc_buf_hdr_t's
|
|
* list and free it.
|
|
*/
|
|
static void
|
|
arc_buf_destroy_impl(arc_buf_t *buf)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
|
|
/*
|
|
* Free up the data associated with the buf but only if we're not
|
|
* sharing this with the hdr. If we are sharing it with the hdr, the
|
|
* hdr is responsible for doing the free.
|
|
*/
|
|
if (buf->b_data != NULL) {
|
|
/*
|
|
* We're about to change the hdr's b_flags. We must either
|
|
* hold the hash_lock or be undiscoverable.
|
|
*/
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)) || HDR_EMPTY(hdr));
|
|
|
|
arc_cksum_verify(buf);
|
|
arc_buf_unwatch(buf);
|
|
|
|
if (arc_buf_is_shared(buf)) {
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_SHARED_DATA);
|
|
} else {
|
|
uint64_t size = arc_buf_size(buf);
|
|
arc_free_data_buf(hdr, buf->b_data, size, buf);
|
|
ARCSTAT_INCR(arcstat_overhead_size, -size);
|
|
}
|
|
buf->b_data = NULL;
|
|
|
|
ASSERT(hdr->b_l1hdr.b_bufcnt > 0);
|
|
hdr->b_l1hdr.b_bufcnt -= 1;
|
|
}
|
|
|
|
arc_buf_t *lastbuf = arc_buf_remove(hdr, buf);
|
|
|
|
if (ARC_BUF_SHARED(buf) && !ARC_BUF_COMPRESSED(buf)) {
|
|
/*
|
|
* If the current arc_buf_t is sharing its data buffer with the
|
|
* hdr, then reassign the hdr's b_pabd to share it with the new
|
|
* buffer at the end of the list. The shared buffer is always
|
|
* the last one on the hdr's buffer list.
|
|
*
|
|
* There is an equivalent case for compressed bufs, but since
|
|
* they aren't guaranteed to be the last buf in the list and
|
|
* that is an exceedingly rare case, we just allow that space be
|
|
* wasted temporarily.
|
|
*/
|
|
if (lastbuf != NULL) {
|
|
/* Only one buf can be shared at once */
|
|
VERIFY(!arc_buf_is_shared(lastbuf));
|
|
/* hdr is uncompressed so can't have compressed buf */
|
|
VERIFY(!ARC_BUF_COMPRESSED(lastbuf));
|
|
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
arc_hdr_free_pabd(hdr);
|
|
|
|
/*
|
|
* We must setup a new shared block between the
|
|
* last buffer and the hdr. The data would have
|
|
* been allocated by the arc buf so we need to transfer
|
|
* ownership to the hdr since it's now being shared.
|
|
*/
|
|
arc_share_buf(hdr, lastbuf);
|
|
}
|
|
} else if (HDR_SHARED_DATA(hdr)) {
|
|
/*
|
|
* Uncompressed shared buffers are always at the end
|
|
* of the list. Compressed buffers don't have the
|
|
* same requirements. This makes it hard to
|
|
* simply assert that the lastbuf is shared so
|
|
* we rely on the hdr's compression flags to determine
|
|
* if we have a compressed, shared buffer.
|
|
*/
|
|
ASSERT3P(lastbuf, !=, NULL);
|
|
ASSERT(arc_buf_is_shared(lastbuf) ||
|
|
HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF);
|
|
}
|
|
|
|
/*
|
|
* Free the checksum if we're removing the last uncompressed buf from
|
|
* this hdr.
|
|
*/
|
|
if (!arc_hdr_has_uncompressed_buf(hdr)) {
|
|
arc_cksum_free(hdr);
|
|
}
|
|
|
|
/* clean up the buf */
|
|
buf->b_hdr = NULL;
|
|
kmem_cache_free(buf_cache, buf);
|
|
}
|
|
|
|
static void
|
|
arc_hdr_alloc_pabd(arc_buf_hdr_t *hdr)
|
|
{
|
|
ASSERT3U(HDR_GET_LSIZE(hdr), >, 0);
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
ASSERT(!HDR_SHARED_DATA(hdr));
|
|
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
hdr->b_l1hdr.b_pabd = arc_get_data_abd(hdr, arc_hdr_size(hdr), hdr);
|
|
hdr->b_l1hdr.b_byteswap = DMU_BSWAP_NUMFUNCS;
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
|
|
ARCSTAT_INCR(arcstat_compressed_size, arc_hdr_size(hdr));
|
|
ARCSTAT_INCR(arcstat_uncompressed_size, HDR_GET_LSIZE(hdr));
|
|
}
|
|
|
|
static void
|
|
arc_hdr_free_pabd(arc_buf_hdr_t *hdr)
|
|
{
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
|
|
/*
|
|
* If the hdr is currently being written to the l2arc then
|
|
* we defer freeing the data by adding it to the l2arc_free_on_write
|
|
* list. The l2arc will free the data once it's finished
|
|
* writing it to the l2arc device.
|
|
*/
|
|
if (HDR_L2_WRITING(hdr)) {
|
|
arc_hdr_free_on_write(hdr);
|
|
ARCSTAT_BUMP(arcstat_l2_free_on_write);
|
|
} else {
|
|
arc_free_data_abd(hdr, hdr->b_l1hdr.b_pabd,
|
|
arc_hdr_size(hdr), hdr);
|
|
}
|
|
hdr->b_l1hdr.b_pabd = NULL;
|
|
hdr->b_l1hdr.b_byteswap = DMU_BSWAP_NUMFUNCS;
|
|
|
|
ARCSTAT_INCR(arcstat_compressed_size, -arc_hdr_size(hdr));
|
|
ARCSTAT_INCR(arcstat_uncompressed_size, -HDR_GET_LSIZE(hdr));
|
|
}
|
|
|
|
static arc_buf_hdr_t *
|
|
arc_hdr_alloc(uint64_t spa, int32_t psize, int32_t lsize,
|
|
enum zio_compress compression_type, arc_buf_contents_t type)
|
|
{
|
|
arc_buf_hdr_t *hdr;
|
|
|
|
VERIFY(type == ARC_BUFC_DATA || type == ARC_BUFC_METADATA);
|
|
|
|
hdr = kmem_cache_alloc(hdr_full_cache, KM_PUSHPAGE);
|
|
ASSERT(HDR_EMPTY(hdr));
|
|
ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);
|
|
HDR_SET_PSIZE(hdr, psize);
|
|
HDR_SET_LSIZE(hdr, lsize);
|
|
hdr->b_spa = spa;
|
|
hdr->b_type = type;
|
|
hdr->b_flags = 0;
|
|
arc_hdr_set_flags(hdr, arc_bufc_to_flags(type) | ARC_FLAG_HAS_L1HDR);
|
|
arc_hdr_set_compress(hdr, compression_type);
|
|
|
|
hdr->b_l1hdr.b_state = arc_anon;
|
|
hdr->b_l1hdr.b_arc_access = 0;
|
|
hdr->b_l1hdr.b_bufcnt = 0;
|
|
hdr->b_l1hdr.b_buf = NULL;
|
|
|
|
/*
|
|
* Allocate the hdr's buffer. This will contain either
|
|
* the compressed or uncompressed data depending on the block
|
|
* it references and compressed arc enablement.
|
|
*/
|
|
arc_hdr_alloc_pabd(hdr);
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
|
|
return (hdr);
|
|
}
|
|
|
|
/*
|
|
* Transition between the two allocation states for the arc_buf_hdr struct.
|
|
* The arc_buf_hdr struct can be allocated with (hdr_full_cache) or without
|
|
* (hdr_l2only_cache) the fields necessary for the L1 cache - the smaller
|
|
* version is used when a cache buffer is only in the L2ARC in order to reduce
|
|
* memory usage.
|
|
*/
|
|
static arc_buf_hdr_t *
|
|
arc_hdr_realloc(arc_buf_hdr_t *hdr, kmem_cache_t *old, kmem_cache_t *new)
|
|
{
|
|
arc_buf_hdr_t *nhdr;
|
|
l2arc_dev_t *dev = hdr->b_l2hdr.b_dev;
|
|
|
|
ASSERT(HDR_HAS_L2HDR(hdr));
|
|
ASSERT((old == hdr_full_cache && new == hdr_l2only_cache) ||
|
|
(old == hdr_l2only_cache && new == hdr_full_cache));
|
|
|
|
nhdr = kmem_cache_alloc(new, KM_PUSHPAGE);
|
|
|
|
ASSERT(MUTEX_HELD(HDR_LOCK(hdr)));
|
|
buf_hash_remove(hdr);
|
|
|
|
bcopy(hdr, nhdr, HDR_L2ONLY_SIZE);
|
|
|
|
if (new == hdr_full_cache) {
|
|
arc_hdr_set_flags(nhdr, ARC_FLAG_HAS_L1HDR);
|
|
/*
|
|
* arc_access and arc_change_state need to be aware that a
|
|
* header has just come out of L2ARC, so we set its state to
|
|
* l2c_only even though it's about to change.
|
|
*/
|
|
nhdr->b_l1hdr.b_state = arc_l2c_only;
|
|
|
|
/* Verify previous threads set to NULL before freeing */
|
|
ASSERT3P(nhdr->b_l1hdr.b_pabd, ==, NULL);
|
|
} else {
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
|
|
ASSERT0(hdr->b_l1hdr.b_bufcnt);
|
|
ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);
|
|
|
|
/*
|
|
* If we've reached here, We must have been called from
|
|
* arc_evict_hdr(), as such we should have already been
|
|
* removed from any ghost list we were previously on
|
|
* (which protects us from racing with arc_evict_state),
|
|
* thus no locking is needed during this check.
|
|
*/
|
|
ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
|
|
|
|
/*
|
|
* A buffer must not be moved into the arc_l2c_only
|
|
* state if it's not finished being written out to the
|
|
* l2arc device. Otherwise, the b_l1hdr.b_pabd field
|
|
* might try to be accessed, even though it was removed.
|
|
*/
|
|
VERIFY(!HDR_L2_WRITING(hdr));
|
|
VERIFY3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
|
|
arc_hdr_clear_flags(nhdr, ARC_FLAG_HAS_L1HDR);
|
|
}
|
|
/*
|
|
* The header has been reallocated so we need to re-insert it into any
|
|
* lists it was on.
|
|
*/
|
|
(void) buf_hash_insert(nhdr, NULL);
|
|
|
|
ASSERT(list_link_active(&hdr->b_l2hdr.b_l2node));
|
|
|
|
mutex_enter(&dev->l2ad_mtx);
|
|
|
|
/*
|
|
* We must place the realloc'ed header back into the list at
|
|
* the same spot. Otherwise, if it's placed earlier in the list,
|
|
* l2arc_write_buffers() could find it during the function's
|
|
* write phase, and try to write it out to the l2arc.
|
|
*/
|
|
list_insert_after(&dev->l2ad_buflist, hdr, nhdr);
|
|
list_remove(&dev->l2ad_buflist, hdr);
|
|
|
|
mutex_exit(&dev->l2ad_mtx);
|
|
|
|
/*
|
|
* Since we're using the pointer address as the tag when
|
|
* incrementing and decrementing the l2ad_alloc refcount, we
|
|
* must remove the old pointer (that we're about to destroy) and
|
|
* add the new pointer to the refcount. Otherwise we'd remove
|
|
* the wrong pointer address when calling arc_hdr_destroy() later.
|
|
*/
|
|
|
|
(void) refcount_remove_many(&dev->l2ad_alloc, arc_hdr_size(hdr), hdr);
|
|
(void) refcount_add_many(&dev->l2ad_alloc, arc_hdr_size(nhdr), nhdr);
|
|
|
|
buf_discard_identity(hdr);
|
|
kmem_cache_free(old, hdr);
|
|
|
|
return (nhdr);
|
|
}
|
|
|
|
/*
|
|
* Allocate a new arc_buf_hdr_t and arc_buf_t and return the buf to the caller.
|
|
* The buf is returned thawed since we expect the consumer to modify it.
|
|
*/
|
|
arc_buf_t *
|
|
arc_alloc_buf(spa_t *spa, void *tag, arc_buf_contents_t type, int32_t size)
|
|
{
|
|
arc_buf_hdr_t *hdr = arc_hdr_alloc(spa_load_guid(spa), size, size,
|
|
ZIO_COMPRESS_OFF, type);
|
|
ASSERT(!MUTEX_HELD(HDR_LOCK(hdr)));
|
|
|
|
arc_buf_t *buf = NULL;
|
|
VERIFY0(arc_buf_alloc_impl(hdr, tag, B_FALSE, B_FALSE, &buf));
|
|
arc_buf_thaw(buf);
|
|
|
|
return (buf);
|
|
}
|
|
|
|
/*
|
|
* Allocate a compressed buf in the same manner as arc_alloc_buf. Don't use this
|
|
* for bufs containing metadata.
|
|
*/
|
|
arc_buf_t *
|
|
arc_alloc_compressed_buf(spa_t *spa, void *tag, uint64_t psize, uint64_t lsize,
|
|
enum zio_compress compression_type)
|
|
{
|
|
ASSERT3U(lsize, >, 0);
|
|
ASSERT3U(lsize, >=, psize);
|
|
ASSERT(compression_type > ZIO_COMPRESS_OFF);
|
|
ASSERT(compression_type < ZIO_COMPRESS_FUNCTIONS);
|
|
|
|
arc_buf_hdr_t *hdr = arc_hdr_alloc(spa_load_guid(spa), psize, lsize,
|
|
compression_type, ARC_BUFC_DATA);
|
|
ASSERT(!MUTEX_HELD(HDR_LOCK(hdr)));
|
|
|
|
arc_buf_t *buf = NULL;
|
|
VERIFY0(arc_buf_alloc_impl(hdr, tag, B_TRUE, B_FALSE, &buf));
|
|
arc_buf_thaw(buf);
|
|
ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);
|
|
|
|
if (!arc_buf_is_shared(buf)) {
|
|
/*
|
|
* To ensure that the hdr has the correct data in it if we call
|
|
* arc_decompress() on this buf before it's been written to
|
|
* disk, it's easiest if we just set up sharing between the
|
|
* buf and the hdr.
|
|
*/
|
|
ASSERT(!abd_is_linear(hdr->b_l1hdr.b_pabd));
|
|
arc_hdr_free_pabd(hdr);
|
|
arc_share_buf(hdr, buf);
|
|
}
|
|
|
|
return (buf);
|
|
}
|
|
|
|
static void
|
|
arc_hdr_l2hdr_destroy(arc_buf_hdr_t *hdr)
|
|
{
|
|
l2arc_buf_hdr_t *l2hdr = &hdr->b_l2hdr;
|
|
l2arc_dev_t *dev = l2hdr->b_dev;
|
|
uint64_t asize = arc_hdr_size(hdr);
|
|
|
|
ASSERT(MUTEX_HELD(&dev->l2ad_mtx));
|
|
ASSERT(HDR_HAS_L2HDR(hdr));
|
|
|
|
list_remove(&dev->l2ad_buflist, hdr);
|
|
|
|
ARCSTAT_INCR(arcstat_l2_asize, -asize);
|
|
ARCSTAT_INCR(arcstat_l2_size, -HDR_GET_LSIZE(hdr));
|
|
|
|
vdev_space_update(dev->l2ad_vdev, -asize, 0, 0);
|
|
|
|
(void) refcount_remove_many(&dev->l2ad_alloc, asize, hdr);
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_HAS_L2HDR);
|
|
}
|
|
|
|
static void
|
|
arc_hdr_destroy(arc_buf_hdr_t *hdr)
|
|
{
|
|
if (HDR_HAS_L1HDR(hdr)) {
|
|
ASSERT(hdr->b_l1hdr.b_buf == NULL ||
|
|
hdr->b_l1hdr.b_bufcnt > 0);
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
|
|
}
|
|
ASSERT(!HDR_IO_IN_PROGRESS(hdr));
|
|
ASSERT(!HDR_IN_HASH_TABLE(hdr));
|
|
|
|
if (!HDR_EMPTY(hdr))
|
|
buf_discard_identity(hdr);
|
|
|
|
if (HDR_HAS_L2HDR(hdr)) {
|
|
l2arc_dev_t *dev = hdr->b_l2hdr.b_dev;
|
|
boolean_t buflist_held = MUTEX_HELD(&dev->l2ad_mtx);
|
|
|
|
if (!buflist_held)
|
|
mutex_enter(&dev->l2ad_mtx);
|
|
|
|
/*
|
|
* Even though we checked this conditional above, we
|
|
* need to check this again now that we have the
|
|
* l2ad_mtx. This is because we could be racing with
|
|
* another thread calling l2arc_evict() which might have
|
|
* destroyed this header's L2 portion as we were waiting
|
|
* to acquire the l2ad_mtx. If that happens, we don't
|
|
* want to re-destroy the header's L2 portion.
|
|
*/
|
|
if (HDR_HAS_L2HDR(hdr))
|
|
arc_hdr_l2hdr_destroy(hdr);
|
|
|
|
if (!buflist_held)
|
|
mutex_exit(&dev->l2ad_mtx);
|
|
}
|
|
|
|
if (HDR_HAS_L1HDR(hdr)) {
|
|
arc_cksum_free(hdr);
|
|
|
|
while (hdr->b_l1hdr.b_buf != NULL)
|
|
arc_buf_destroy_impl(hdr->b_l1hdr.b_buf);
|
|
|
|
if (hdr->b_l1hdr.b_pabd != NULL)
|
|
arc_hdr_free_pabd(hdr);
|
|
}
|
|
|
|
ASSERT3P(hdr->b_hash_next, ==, NULL);
|
|
if (HDR_HAS_L1HDR(hdr)) {
|
|
ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
|
|
ASSERT3P(hdr->b_l1hdr.b_acb, ==, NULL);
|
|
kmem_cache_free(hdr_full_cache, hdr);
|
|
} else {
|
|
kmem_cache_free(hdr_l2only_cache, hdr);
|
|
}
|
|
}
|
|
|
|
void
|
|
arc_buf_destroy(arc_buf_t *buf, void* tag)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
kmutex_t *hash_lock = HDR_LOCK(hdr);
|
|
|
|
if (hdr->b_l1hdr.b_state == arc_anon) {
|
|
ASSERT3U(hdr->b_l1hdr.b_bufcnt, ==, 1);
|
|
ASSERT(!HDR_IO_IN_PROGRESS(hdr));
|
|
VERIFY0(remove_reference(hdr, NULL, tag));
|
|
arc_hdr_destroy(hdr);
|
|
return;
|
|
}
|
|
|
|
mutex_enter(hash_lock);
|
|
ASSERT3P(hdr, ==, buf->b_hdr);
|
|
ASSERT(hdr->b_l1hdr.b_bufcnt > 0);
|
|
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr));
|
|
ASSERT3P(hdr->b_l1hdr.b_state, !=, arc_anon);
|
|
ASSERT3P(buf->b_data, !=, NULL);
|
|
|
|
(void) remove_reference(hdr, hash_lock, tag);
|
|
arc_buf_destroy_impl(buf);
|
|
mutex_exit(hash_lock);
|
|
}
|
|
|
|
/*
|
|
* Evict the arc_buf_hdr that is provided as a parameter. The resultant
|
|
* state of the header is dependent on its state prior to entering this
|
|
* function. The following transitions are possible:
|
|
*
|
|
* - arc_mru -> arc_mru_ghost
|
|
* - arc_mfu -> arc_mfu_ghost
|
|
* - arc_mru_ghost -> arc_l2c_only
|
|
* - arc_mru_ghost -> deleted
|
|
* - arc_mfu_ghost -> arc_l2c_only
|
|
* - arc_mfu_ghost -> deleted
|
|
*/
|
|
static int64_t
|
|
arc_evict_hdr(arc_buf_hdr_t *hdr, kmutex_t *hash_lock)
|
|
{
|
|
arc_state_t *evicted_state, *state;
|
|
int64_t bytes_evicted = 0;
|
|
|
|
ASSERT(MUTEX_HELD(hash_lock));
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
state = hdr->b_l1hdr.b_state;
|
|
if (GHOST_STATE(state)) {
|
|
ASSERT(!HDR_IO_IN_PROGRESS(hdr));
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
|
|
|
|
/*
|
|
* l2arc_write_buffers() relies on a header's L1 portion
|
|
* (i.e. its b_pabd field) during it's write phase.
|
|
* Thus, we cannot push a header onto the arc_l2c_only
|
|
* state (removing its L1 piece) until the header is
|
|
* done being written to the l2arc.
|
|
*/
|
|
if (HDR_HAS_L2HDR(hdr) && HDR_L2_WRITING(hdr)) {
|
|
ARCSTAT_BUMP(arcstat_evict_l2_skip);
|
|
return (bytes_evicted);
|
|
}
|
|
|
|
ARCSTAT_BUMP(arcstat_deleted);
|
|
bytes_evicted += HDR_GET_LSIZE(hdr);
|
|
|
|
DTRACE_PROBE1(arc__delete, arc_buf_hdr_t *, hdr);
|
|
|
|
if (HDR_HAS_L2HDR(hdr)) {
|
|
ASSERT(hdr->b_l1hdr.b_pabd == NULL);
|
|
/*
|
|
* This buffer is cached on the 2nd Level ARC;
|
|
* don't destroy the header.
|
|
*/
|
|
arc_change_state(arc_l2c_only, hdr, hash_lock);
|
|
/*
|
|
* dropping from L1+L2 cached to L2-only,
|
|
* realloc to remove the L1 header.
|
|
*/
|
|
hdr = arc_hdr_realloc(hdr, hdr_full_cache,
|
|
hdr_l2only_cache);
|
|
} else {
|
|
arc_change_state(arc_anon, hdr, hash_lock);
|
|
arc_hdr_destroy(hdr);
|
|
}
|
|
return (bytes_evicted);
|
|
}
|
|
|
|
ASSERT(state == arc_mru || state == arc_mfu);
|
|
evicted_state = (state == arc_mru) ? arc_mru_ghost : arc_mfu_ghost;
|
|
|
|
/* prefetch buffers have a minimum lifespan */
|
|
if (HDR_IO_IN_PROGRESS(hdr) ||
|
|
((hdr->b_flags & (ARC_FLAG_PREFETCH | ARC_FLAG_INDIRECT)) &&
|
|
ddi_get_lbolt() - hdr->b_l1hdr.b_arc_access <
|
|
arc_min_prefetch_lifespan)) {
|
|
ARCSTAT_BUMP(arcstat_evict_skip);
|
|
return (bytes_evicted);
|
|
}
|
|
|
|
ASSERT0(refcount_count(&hdr->b_l1hdr.b_refcnt));
|
|
while (hdr->b_l1hdr.b_buf) {
|
|
arc_buf_t *buf = hdr->b_l1hdr.b_buf;
|
|
if (!mutex_tryenter(&buf->b_evict_lock)) {
|
|
ARCSTAT_BUMP(arcstat_mutex_miss);
|
|
break;
|
|
}
|
|
if (buf->b_data != NULL)
|
|
bytes_evicted += HDR_GET_LSIZE(hdr);
|
|
mutex_exit(&buf->b_evict_lock);
|
|
arc_buf_destroy_impl(buf);
|
|
}
|
|
|
|
if (HDR_HAS_L2HDR(hdr)) {
|
|
ARCSTAT_INCR(arcstat_evict_l2_cached, HDR_GET_LSIZE(hdr));
|
|
} else {
|
|
if (l2arc_write_eligible(hdr->b_spa, hdr)) {
|
|
ARCSTAT_INCR(arcstat_evict_l2_eligible,
|
|
HDR_GET_LSIZE(hdr));
|
|
} else {
|
|
ARCSTAT_INCR(arcstat_evict_l2_ineligible,
|
|
HDR_GET_LSIZE(hdr));
|
|
}
|
|
}
|
|
|
|
if (hdr->b_l1hdr.b_bufcnt == 0) {
|
|
arc_cksum_free(hdr);
|
|
|
|
bytes_evicted += arc_hdr_size(hdr);
|
|
|
|
/*
|
|
* If this hdr is being evicted and has a compressed
|
|
* buffer then we discard it here before we change states.
|
|
* This ensures that the accounting is updated correctly
|
|
* in arc_free_data_impl().
|
|
*/
|
|
arc_hdr_free_pabd(hdr);
|
|
|
|
arc_change_state(evicted_state, hdr, hash_lock);
|
|
ASSERT(HDR_IN_HASH_TABLE(hdr));
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_IN_HASH_TABLE);
|
|
DTRACE_PROBE1(arc__evict, arc_buf_hdr_t *, hdr);
|
|
}
|
|
|
|
return (bytes_evicted);
|
|
}
|
|
|
|
static uint64_t
|
|
arc_evict_state_impl(multilist_t *ml, int idx, arc_buf_hdr_t *marker,
|
|
uint64_t spa, int64_t bytes)
|
|
{
|
|
multilist_sublist_t *mls;
|
|
uint64_t bytes_evicted = 0;
|
|
arc_buf_hdr_t *hdr;
|
|
kmutex_t *hash_lock;
|
|
int evict_count = 0;
|
|
|
|
ASSERT3P(marker, !=, NULL);
|
|
IMPLY(bytes < 0, bytes == ARC_EVICT_ALL);
|
|
|
|
mls = multilist_sublist_lock(ml, idx);
|
|
|
|
for (hdr = multilist_sublist_prev(mls, marker); hdr != NULL;
|
|
hdr = multilist_sublist_prev(mls, marker)) {
|
|
if ((bytes != ARC_EVICT_ALL && bytes_evicted >= bytes) ||
|
|
(evict_count >= zfs_arc_evict_batch_limit))
|
|
break;
|
|
|
|
/*
|
|
* To keep our iteration location, move the marker
|
|
* forward. Since we're not holding hdr's hash lock, we
|
|
* must be very careful and not remove 'hdr' from the
|
|
* sublist. Otherwise, other consumers might mistake the
|
|
* 'hdr' as not being on a sublist when they call the
|
|
* multilist_link_active() function (they all rely on
|
|
* the hash lock protecting concurrent insertions and
|
|
* removals). multilist_sublist_move_forward() was
|
|
* specifically implemented to ensure this is the case
|
|
* (only 'marker' will be removed and re-inserted).
|
|
*/
|
|
multilist_sublist_move_forward(mls, marker);
|
|
|
|
/*
|
|
* The only case where the b_spa field should ever be
|
|
* zero, is the marker headers inserted by
|
|
* arc_evict_state(). It's possible for multiple threads
|
|
* to be calling arc_evict_state() concurrently (e.g.
|
|
* dsl_pool_close() and zio_inject_fault()), so we must
|
|
* skip any markers we see from these other threads.
|
|
*/
|
|
if (hdr->b_spa == 0)
|
|
continue;
|
|
|
|
/* we're only interested in evicting buffers of a certain spa */
|
|
if (spa != 0 && hdr->b_spa != spa) {
|
|
ARCSTAT_BUMP(arcstat_evict_skip);
|
|
continue;
|
|
}
|
|
|
|
hash_lock = HDR_LOCK(hdr);
|
|
|
|
/*
|
|
* We aren't calling this function from any code path
|
|
* that would already be holding a hash lock, so we're
|
|
* asserting on this assumption to be defensive in case
|
|
* this ever changes. Without this check, it would be
|
|
* possible to incorrectly increment arcstat_mutex_miss
|
|
* below (e.g. if the code changed such that we called
|
|
* this function with a hash lock held).
|
|
*/
|
|
ASSERT(!MUTEX_HELD(hash_lock));
|
|
|
|
if (mutex_tryenter(hash_lock)) {
|
|
uint64_t evicted = arc_evict_hdr(hdr, hash_lock);
|
|
mutex_exit(hash_lock);
|
|
|
|
bytes_evicted += evicted;
|
|
|
|
/*
|
|
* If evicted is zero, arc_evict_hdr() must have
|
|
* decided to skip this header, don't increment
|
|
* evict_count in this case.
|
|
*/
|
|
if (evicted != 0)
|
|
evict_count++;
|
|
|
|
/*
|
|
* If arc_size isn't overflowing, signal any
|
|
* threads that might happen to be waiting.
|
|
*
|
|
* For each header evicted, we wake up a single
|
|
* thread. If we used cv_broadcast, we could
|
|
* wake up "too many" threads causing arc_size
|
|
* to significantly overflow arc_c; since
|
|
* arc_get_data_impl() doesn't check for overflow
|
|
* when it's woken up (it doesn't because it's
|
|
* possible for the ARC to be overflowing while
|
|
* full of un-evictable buffers, and the
|
|
* function should proceed in this case).
|
|
*
|
|
* If threads are left sleeping, due to not
|
|
* using cv_broadcast, they will be woken up
|
|
* just before arc_reclaim_thread() sleeps.
|
|
*/
|
|
mutex_enter(&arc_reclaim_lock);
|
|
if (!arc_is_overflowing())
|
|
cv_signal(&arc_reclaim_waiters_cv);
|
|
mutex_exit(&arc_reclaim_lock);
|
|
} else {
|
|
ARCSTAT_BUMP(arcstat_mutex_miss);
|
|
}
|
|
}
|
|
|
|
multilist_sublist_unlock(mls);
|
|
|
|
return (bytes_evicted);
|
|
}
|
|
|
|
/*
|
|
* Evict buffers from the given arc state, until we've removed the
|
|
* specified number of bytes. Move the removed buffers to the
|
|
* appropriate evict state.
|
|
*
|
|
* This function makes a "best effort". It skips over any buffers
|
|
* it can't get a hash_lock on, and so, may not catch all candidates.
|
|
* It may also return without evicting as much space as requested.
|
|
*
|
|
* If bytes is specified using the special value ARC_EVICT_ALL, this
|
|
* will evict all available (i.e. unlocked and evictable) buffers from
|
|
* the given arc state; which is used by arc_flush().
|
|
*/
|
|
static uint64_t
|
|
arc_evict_state(arc_state_t *state, uint64_t spa, int64_t bytes,
|
|
arc_buf_contents_t type)
|
|
{
|
|
uint64_t total_evicted = 0;
|
|
multilist_t *ml = state->arcs_list[type];
|
|
int num_sublists;
|
|
arc_buf_hdr_t **markers;
|
|
int i;
|
|
|
|
IMPLY(bytes < 0, bytes == ARC_EVICT_ALL);
|
|
|
|
num_sublists = multilist_get_num_sublists(ml);
|
|
|
|
/*
|
|
* If we've tried to evict from each sublist, made some
|
|
* progress, but still have not hit the target number of bytes
|
|
* to evict, we want to keep trying. The markers allow us to
|
|
* pick up where we left off for each individual sublist, rather
|
|
* than starting from the tail each time.
|
|
*/
|
|
markers = kmem_zalloc(sizeof (*markers) * num_sublists, KM_SLEEP);
|
|
for (i = 0; i < num_sublists; i++) {
|
|
multilist_sublist_t *mls;
|
|
|
|
markers[i] = kmem_cache_alloc(hdr_full_cache, KM_SLEEP);
|
|
|
|
/*
|
|
* A b_spa of 0 is used to indicate that this header is
|
|
* a marker. This fact is used in arc_adjust_type() and
|
|
* arc_evict_state_impl().
|
|
*/
|
|
markers[i]->b_spa = 0;
|
|
|
|
mls = multilist_sublist_lock(ml, i);
|
|
multilist_sublist_insert_tail(mls, markers[i]);
|
|
multilist_sublist_unlock(mls);
|
|
}
|
|
|
|
/*
|
|
* While we haven't hit our target number of bytes to evict, or
|
|
* we're evicting all available buffers.
|
|
*/
|
|
while (total_evicted < bytes || bytes == ARC_EVICT_ALL) {
|
|
int sublist_idx = multilist_get_random_index(ml);
|
|
uint64_t scan_evicted = 0;
|
|
|
|
/*
|
|
* Try to reduce pinned dnodes with a floor of arc_dnode_limit.
|
|
* Request that 10% of the LRUs be scanned by the superblock
|
|
* shrinker.
|
|
*/
|
|
if (type == ARC_BUFC_DATA && arc_dnode_size > arc_dnode_limit)
|
|
arc_prune_async((arc_dnode_size - arc_dnode_limit) /
|
|
sizeof (dnode_t) / zfs_arc_dnode_reduce_percent);
|
|
|
|
/*
|
|
* Start eviction using a randomly selected sublist,
|
|
* this is to try and evenly balance eviction across all
|
|
* sublists. Always starting at the same sublist
|
|
* (e.g. index 0) would cause evictions to favor certain
|
|
* sublists over others.
|
|
*/
|
|
for (i = 0; i < num_sublists; i++) {
|
|
uint64_t bytes_remaining;
|
|
uint64_t bytes_evicted;
|
|
|
|
if (bytes == ARC_EVICT_ALL)
|
|
bytes_remaining = ARC_EVICT_ALL;
|
|
else if (total_evicted < bytes)
|
|
bytes_remaining = bytes - total_evicted;
|
|
else
|
|
break;
|
|
|
|
bytes_evicted = arc_evict_state_impl(ml, sublist_idx,
|
|
markers[sublist_idx], spa, bytes_remaining);
|
|
|
|
scan_evicted += bytes_evicted;
|
|
total_evicted += bytes_evicted;
|
|
|
|
/* we've reached the end, wrap to the beginning */
|
|
if (++sublist_idx >= num_sublists)
|
|
sublist_idx = 0;
|
|
}
|
|
|
|
/*
|
|
* If we didn't evict anything during this scan, we have
|
|
* no reason to believe we'll evict more during another
|
|
* scan, so break the loop.
|
|
*/
|
|
if (scan_evicted == 0) {
|
|
/* This isn't possible, let's make that obvious */
|
|
ASSERT3S(bytes, !=, 0);
|
|
|
|
/*
|
|
* When bytes is ARC_EVICT_ALL, the only way to
|
|
* break the loop is when scan_evicted is zero.
|
|
* In that case, we actually have evicted enough,
|
|
* so we don't want to increment the kstat.
|
|
*/
|
|
if (bytes != ARC_EVICT_ALL) {
|
|
ASSERT3S(total_evicted, <, bytes);
|
|
ARCSTAT_BUMP(arcstat_evict_not_enough);
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < num_sublists; i++) {
|
|
multilist_sublist_t *mls = multilist_sublist_lock(ml, i);
|
|
multilist_sublist_remove(mls, markers[i]);
|
|
multilist_sublist_unlock(mls);
|
|
|
|
kmem_cache_free(hdr_full_cache, markers[i]);
|
|
}
|
|
kmem_free(markers, sizeof (*markers) * num_sublists);
|
|
|
|
return (total_evicted);
|
|
}
|
|
|
|
/*
|
|
* Flush all "evictable" data of the given type from the arc state
|
|
* specified. This will not evict any "active" buffers (i.e. referenced).
|
|
*
|
|
* When 'retry' is set to B_FALSE, the function will make a single pass
|
|
* over the state and evict any buffers that it can. Since it doesn't
|
|
* continually retry the eviction, it might end up leaving some buffers
|
|
* in the ARC due to lock misses.
|
|
*
|
|
* When 'retry' is set to B_TRUE, the function will continually retry the
|
|
* eviction until *all* evictable buffers have been removed from the
|
|
* state. As a result, if concurrent insertions into the state are
|
|
* allowed (e.g. if the ARC isn't shutting down), this function might
|
|
* wind up in an infinite loop, continually trying to evict buffers.
|
|
*/
|
|
static uint64_t
|
|
arc_flush_state(arc_state_t *state, uint64_t spa, arc_buf_contents_t type,
|
|
boolean_t retry)
|
|
{
|
|
uint64_t evicted = 0;
|
|
|
|
while (refcount_count(&state->arcs_esize[type]) != 0) {
|
|
evicted += arc_evict_state(state, spa, ARC_EVICT_ALL, type);
|
|
|
|
if (!retry)
|
|
break;
|
|
}
|
|
|
|
return (evicted);
|
|
}
|
|
|
|
/*
|
|
* Helper function for arc_prune_async() it is responsible for safely
|
|
* handling the execution of a registered arc_prune_func_t.
|
|
*/
|
|
static void
|
|
arc_prune_task(void *ptr)
|
|
{
|
|
arc_prune_t *ap = (arc_prune_t *)ptr;
|
|
arc_prune_func_t *func = ap->p_pfunc;
|
|
|
|
if (func != NULL)
|
|
func(ap->p_adjust, ap->p_private);
|
|
|
|
refcount_remove(&ap->p_refcnt, func);
|
|
}
|
|
|
|
/*
|
|
* Notify registered consumers they must drop holds on a portion of the ARC
|
|
* buffered they reference. This provides a mechanism to ensure the ARC can
|
|
* honor the arc_meta_limit and reclaim otherwise pinned ARC buffers. This
|
|
* is analogous to dnlc_reduce_cache() but more generic.
|
|
*
|
|
* This operation is performed asynchronously so it may be safely called
|
|
* in the context of the arc_reclaim_thread(). A reference is taken here
|
|
* for each registered arc_prune_t and the arc_prune_task() is responsible
|
|
* for releasing it once the registered arc_prune_func_t has completed.
|
|
*/
|
|
static void
|
|
arc_prune_async(int64_t adjust)
|
|
{
|
|
arc_prune_t *ap;
|
|
|
|
mutex_enter(&arc_prune_mtx);
|
|
for (ap = list_head(&arc_prune_list); ap != NULL;
|
|
ap = list_next(&arc_prune_list, ap)) {
|
|
|
|
if (refcount_count(&ap->p_refcnt) >= 2)
|
|
continue;
|
|
|
|
refcount_add(&ap->p_refcnt, ap->p_pfunc);
|
|
ap->p_adjust = adjust;
|
|
if (taskq_dispatch(arc_prune_taskq, arc_prune_task,
|
|
ap, TQ_SLEEP) == TASKQID_INVALID) {
|
|
refcount_remove(&ap->p_refcnt, ap->p_pfunc);
|
|
continue;
|
|
}
|
|
ARCSTAT_BUMP(arcstat_prune);
|
|
}
|
|
mutex_exit(&arc_prune_mtx);
|
|
}
|
|
|
|
/*
|
|
* Evict the specified number of bytes from the state specified,
|
|
* restricting eviction to the spa and type given. This function
|
|
* prevents us from trying to evict more from a state's list than
|
|
* is "evictable", and to skip evicting altogether when passed a
|
|
* negative value for "bytes". In contrast, arc_evict_state() will
|
|
* evict everything it can, when passed a negative value for "bytes".
|
|
*/
|
|
static uint64_t
|
|
arc_adjust_impl(arc_state_t *state, uint64_t spa, int64_t bytes,
|
|
arc_buf_contents_t type)
|
|
{
|
|
int64_t delta;
|
|
|
|
if (bytes > 0 && refcount_count(&state->arcs_esize[type]) > 0) {
|
|
delta = MIN(refcount_count(&state->arcs_esize[type]), bytes);
|
|
return (arc_evict_state(state, spa, delta, type));
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The goal of this function is to evict enough meta data buffers from the
|
|
* ARC in order to enforce the arc_meta_limit. Achieving this is slightly
|
|
* more complicated than it appears because it is common for data buffers
|
|
* to have holds on meta data buffers. In addition, dnode meta data buffers
|
|
* will be held by the dnodes in the block preventing them from being freed.
|
|
* This means we can't simply traverse the ARC and expect to always find
|
|
* enough unheld meta data buffer to release.
|
|
*
|
|
* Therefore, this function has been updated to make alternating passes
|
|
* over the ARC releasing data buffers and then newly unheld meta data
|
|
* buffers. This ensures forward progress is maintained and arc_meta_used
|
|
* will decrease. Normally this is sufficient, but if required the ARC
|
|
* will call the registered prune callbacks causing dentry and inodes to
|
|
* be dropped from the VFS cache. This will make dnode meta data buffers
|
|
* available for reclaim.
|
|
*/
|
|
static uint64_t
|
|
arc_adjust_meta_balanced(void)
|
|
{
|
|
int64_t delta, prune = 0, adjustmnt;
|
|
uint64_t total_evicted = 0;
|
|
arc_buf_contents_t type = ARC_BUFC_DATA;
|
|
int restarts = MAX(zfs_arc_meta_adjust_restarts, 0);
|
|
|
|
restart:
|
|
/*
|
|
* This slightly differs than the way we evict from the mru in
|
|
* arc_adjust because we don't have a "target" value (i.e. no
|
|
* "meta" arc_p). As a result, I think we can completely
|
|
* cannibalize the metadata in the MRU before we evict the
|
|
* metadata from the MFU. I think we probably need to implement a
|
|
* "metadata arc_p" value to do this properly.
|
|
*/
|
|
adjustmnt = arc_meta_used - arc_meta_limit;
|
|
|
|
if (adjustmnt > 0 && refcount_count(&arc_mru->arcs_esize[type]) > 0) {
|
|
delta = MIN(refcount_count(&arc_mru->arcs_esize[type]),
|
|
adjustmnt);
|
|
total_evicted += arc_adjust_impl(arc_mru, 0, delta, type);
|
|
adjustmnt -= delta;
|
|
}
|
|
|
|
/*
|
|
* We can't afford to recalculate adjustmnt here. If we do,
|
|
* new metadata buffers can sneak into the MRU or ANON lists,
|
|
* thus penalize the MFU metadata. Although the fudge factor is
|
|
* small, it has been empirically shown to be significant for
|
|
* certain workloads (e.g. creating many empty directories). As
|
|
* such, we use the original calculation for adjustmnt, and
|
|
* simply decrement the amount of data evicted from the MRU.
|
|
*/
|
|
|
|
if (adjustmnt > 0 && refcount_count(&arc_mfu->arcs_esize[type]) > 0) {
|
|
delta = MIN(refcount_count(&arc_mfu->arcs_esize[type]),
|
|
adjustmnt);
|
|
total_evicted += arc_adjust_impl(arc_mfu, 0, delta, type);
|
|
}
|
|
|
|
adjustmnt = arc_meta_used - arc_meta_limit;
|
|
|
|
if (adjustmnt > 0 &&
|
|
refcount_count(&arc_mru_ghost->arcs_esize[type]) > 0) {
|
|
delta = MIN(adjustmnt,
|
|
refcount_count(&arc_mru_ghost->arcs_esize[type]));
|
|
total_evicted += arc_adjust_impl(arc_mru_ghost, 0, delta, type);
|
|
adjustmnt -= delta;
|
|
}
|
|
|
|
if (adjustmnt > 0 &&
|
|
refcount_count(&arc_mfu_ghost->arcs_esize[type]) > 0) {
|
|
delta = MIN(adjustmnt,
|
|
refcount_count(&arc_mfu_ghost->arcs_esize[type]));
|
|
total_evicted += arc_adjust_impl(arc_mfu_ghost, 0, delta, type);
|
|
}
|
|
|
|
/*
|
|
* If after attempting to make the requested adjustment to the ARC
|
|
* the meta limit is still being exceeded then request that the
|
|
* higher layers drop some cached objects which have holds on ARC
|
|
* meta buffers. Requests to the upper layers will be made with
|
|
* increasingly large scan sizes until the ARC is below the limit.
|
|
*/
|
|
if (arc_meta_used > arc_meta_limit) {
|
|
if (type == ARC_BUFC_DATA) {
|
|
type = ARC_BUFC_METADATA;
|
|
} else {
|
|
type = ARC_BUFC_DATA;
|
|
|
|
if (zfs_arc_meta_prune) {
|
|
prune += zfs_arc_meta_prune;
|
|
arc_prune_async(prune);
|
|
}
|
|
}
|
|
|
|
if (restarts > 0) {
|
|
restarts--;
|
|
goto restart;
|
|
}
|
|
}
|
|
return (total_evicted);
|
|
}
|
|
|
|
/*
|
|
* Evict metadata buffers from the cache, such that arc_meta_used is
|
|
* capped by the arc_meta_limit tunable.
|
|
*/
|
|
static uint64_t
|
|
arc_adjust_meta_only(void)
|
|
{
|
|
uint64_t total_evicted = 0;
|
|
int64_t target;
|
|
|
|
/*
|
|
* If we're over the meta limit, we want to evict enough
|
|
* metadata to get back under the meta limit. We don't want to
|
|
* evict so much that we drop the MRU below arc_p, though. If
|
|
* we're over the meta limit more than we're over arc_p, we
|
|
* evict some from the MRU here, and some from the MFU below.
|
|
*/
|
|
target = MIN((int64_t)(arc_meta_used - arc_meta_limit),
|
|
(int64_t)(refcount_count(&arc_anon->arcs_size) +
|
|
refcount_count(&arc_mru->arcs_size) - arc_p));
|
|
|
|
total_evicted += arc_adjust_impl(arc_mru, 0, target, ARC_BUFC_METADATA);
|
|
|
|
/*
|
|
* Similar to the above, we want to evict enough bytes to get us
|
|
* below the meta limit, but not so much as to drop us below the
|
|
* space allotted to the MFU (which is defined as arc_c - arc_p).
|
|
*/
|
|
target = MIN((int64_t)(arc_meta_used - arc_meta_limit),
|
|
(int64_t)(refcount_count(&arc_mfu->arcs_size) - (arc_c - arc_p)));
|
|
|
|
total_evicted += arc_adjust_impl(arc_mfu, 0, target, ARC_BUFC_METADATA);
|
|
|
|
return (total_evicted);
|
|
}
|
|
|
|
static uint64_t
|
|
arc_adjust_meta(void)
|
|
{
|
|
if (zfs_arc_meta_strategy == ARC_STRATEGY_META_ONLY)
|
|
return (arc_adjust_meta_only());
|
|
else
|
|
return (arc_adjust_meta_balanced());
|
|
}
|
|
|
|
/*
|
|
* Return the type of the oldest buffer in the given arc state
|
|
*
|
|
* This function will select a random sublist of type ARC_BUFC_DATA and
|
|
* a random sublist of type ARC_BUFC_METADATA. The tail of each sublist
|
|
* is compared, and the type which contains the "older" buffer will be
|
|
* returned.
|
|
*/
|
|
static arc_buf_contents_t
|
|
arc_adjust_type(arc_state_t *state)
|
|
{
|
|
multilist_t *data_ml = state->arcs_list[ARC_BUFC_DATA];
|
|
multilist_t *meta_ml = state->arcs_list[ARC_BUFC_METADATA];
|
|
int data_idx = multilist_get_random_index(data_ml);
|
|
int meta_idx = multilist_get_random_index(meta_ml);
|
|
multilist_sublist_t *data_mls;
|
|
multilist_sublist_t *meta_mls;
|
|
arc_buf_contents_t type;
|
|
arc_buf_hdr_t *data_hdr;
|
|
arc_buf_hdr_t *meta_hdr;
|
|
|
|
/*
|
|
* We keep the sublist lock until we're finished, to prevent
|
|
* the headers from being destroyed via arc_evict_state().
|
|
*/
|
|
data_mls = multilist_sublist_lock(data_ml, data_idx);
|
|
meta_mls = multilist_sublist_lock(meta_ml, meta_idx);
|
|
|
|
/*
|
|
* These two loops are to ensure we skip any markers that
|
|
* might be at the tail of the lists due to arc_evict_state().
|
|
*/
|
|
|
|
for (data_hdr = multilist_sublist_tail(data_mls); data_hdr != NULL;
|
|
data_hdr = multilist_sublist_prev(data_mls, data_hdr)) {
|
|
if (data_hdr->b_spa != 0)
|
|
break;
|
|
}
|
|
|
|
for (meta_hdr = multilist_sublist_tail(meta_mls); meta_hdr != NULL;
|
|
meta_hdr = multilist_sublist_prev(meta_mls, meta_hdr)) {
|
|
if (meta_hdr->b_spa != 0)
|
|
break;
|
|
}
|
|
|
|
if (data_hdr == NULL && meta_hdr == NULL) {
|
|
type = ARC_BUFC_DATA;
|
|
} else if (data_hdr == NULL) {
|
|
ASSERT3P(meta_hdr, !=, NULL);
|
|
type = ARC_BUFC_METADATA;
|
|
} else if (meta_hdr == NULL) {
|
|
ASSERT3P(data_hdr, !=, NULL);
|
|
type = ARC_BUFC_DATA;
|
|
} else {
|
|
ASSERT3P(data_hdr, !=, NULL);
|
|
ASSERT3P(meta_hdr, !=, NULL);
|
|
|
|
/* The headers can't be on the sublist without an L1 header */
|
|
ASSERT(HDR_HAS_L1HDR(data_hdr));
|
|
ASSERT(HDR_HAS_L1HDR(meta_hdr));
|
|
|
|
if (data_hdr->b_l1hdr.b_arc_access <
|
|
meta_hdr->b_l1hdr.b_arc_access) {
|
|
type = ARC_BUFC_DATA;
|
|
} else {
|
|
type = ARC_BUFC_METADATA;
|
|
}
|
|
}
|
|
|
|
multilist_sublist_unlock(meta_mls);
|
|
multilist_sublist_unlock(data_mls);
|
|
|
|
return (type);
|
|
}
|
|
|
|
/*
|
|
* Evict buffers from the cache, such that arc_size is capped by arc_c.
|
|
*/
|
|
static uint64_t
|
|
arc_adjust(void)
|
|
{
|
|
uint64_t total_evicted = 0;
|
|
uint64_t bytes;
|
|
int64_t target;
|
|
|
|
/*
|
|
* If we're over arc_meta_limit, we want to correct that before
|
|
* potentially evicting data buffers below.
|
|
*/
|
|
total_evicted += arc_adjust_meta();
|
|
|
|
/*
|
|
* Adjust MRU size
|
|
*
|
|
* If we're over the target cache size, we want to evict enough
|
|
* from the list to get back to our target size. We don't want
|
|
* to evict too much from the MRU, such that it drops below
|
|
* arc_p. So, if we're over our target cache size more than
|
|
* the MRU is over arc_p, we'll evict enough to get back to
|
|
* arc_p here, and then evict more from the MFU below.
|
|
*/
|
|
target = MIN((int64_t)(arc_size - arc_c),
|
|
(int64_t)(refcount_count(&arc_anon->arcs_size) +
|
|
refcount_count(&arc_mru->arcs_size) + arc_meta_used - arc_p));
|
|
|
|
/*
|
|
* If we're below arc_meta_min, always prefer to evict data.
|
|
* Otherwise, try to satisfy the requested number of bytes to
|
|
* evict from the type which contains older buffers; in an
|
|
* effort to keep newer buffers in the cache regardless of their
|
|
* type. If we cannot satisfy the number of bytes from this
|
|
* type, spill over into the next type.
|
|
*/
|
|
if (arc_adjust_type(arc_mru) == ARC_BUFC_METADATA &&
|
|
arc_meta_used > arc_meta_min) {
|
|
bytes = arc_adjust_impl(arc_mru, 0, target, ARC_BUFC_METADATA);
|
|
total_evicted += bytes;
|
|
|
|
/*
|
|
* If we couldn't evict our target number of bytes from
|
|
* metadata, we try to get the rest from data.
|
|
*/
|
|
target -= bytes;
|
|
|
|
total_evicted +=
|
|
arc_adjust_impl(arc_mru, 0, target, ARC_BUFC_DATA);
|
|
} else {
|
|
bytes = arc_adjust_impl(arc_mru, 0, target, ARC_BUFC_DATA);
|
|
total_evicted += bytes;
|
|
|
|
/*
|
|
* If we couldn't evict our target number of bytes from
|
|
* data, we try to get the rest from metadata.
|
|
*/
|
|
target -= bytes;
|
|
|
|
total_evicted +=
|
|
arc_adjust_impl(arc_mru, 0, target, ARC_BUFC_METADATA);
|
|
}
|
|
|
|
/*
|
|
* Adjust MFU size
|
|
*
|
|
* Now that we've tried to evict enough from the MRU to get its
|
|
* size back to arc_p, if we're still above the target cache
|
|
* size, we evict the rest from the MFU.
|
|
*/
|
|
target = arc_size - arc_c;
|
|
|
|
if (arc_adjust_type(arc_mfu) == ARC_BUFC_METADATA &&
|
|
arc_meta_used > arc_meta_min) {
|
|
bytes = arc_adjust_impl(arc_mfu, 0, target, ARC_BUFC_METADATA);
|
|
total_evicted += bytes;
|
|
|
|
/*
|
|
* If we couldn't evict our target number of bytes from
|
|
* metadata, we try to get the rest from data.
|
|
*/
|
|
target -= bytes;
|
|
|
|
total_evicted +=
|
|
arc_adjust_impl(arc_mfu, 0, target, ARC_BUFC_DATA);
|
|
} else {
|
|
bytes = arc_adjust_impl(arc_mfu, 0, target, ARC_BUFC_DATA);
|
|
total_evicted += bytes;
|
|
|
|
/*
|
|
* If we couldn't evict our target number of bytes from
|
|
* data, we try to get the rest from data.
|
|
*/
|
|
target -= bytes;
|
|
|
|
total_evicted +=
|
|
arc_adjust_impl(arc_mfu, 0, target, ARC_BUFC_METADATA);
|
|
}
|
|
|
|
/*
|
|
* Adjust ghost lists
|
|
*
|
|
* In addition to the above, the ARC also defines target values
|
|
* for the ghost lists. The sum of the mru list and mru ghost
|
|
* list should never exceed the target size of the cache, and
|
|
* the sum of the mru list, mfu list, mru ghost list, and mfu
|
|
* ghost list should never exceed twice the target size of the
|
|
* cache. The following logic enforces these limits on the ghost
|
|
* caches, and evicts from them as needed.
|
|
*/
|
|
target = refcount_count(&arc_mru->arcs_size) +
|
|
refcount_count(&arc_mru_ghost->arcs_size) - arc_c;
|
|
|
|
bytes = arc_adjust_impl(arc_mru_ghost, 0, target, ARC_BUFC_DATA);
|
|
total_evicted += bytes;
|
|
|
|
target -= bytes;
|
|
|
|
total_evicted +=
|
|
arc_adjust_impl(arc_mru_ghost, 0, target, ARC_BUFC_METADATA);
|
|
|
|
/*
|
|
* We assume the sum of the mru list and mfu list is less than
|
|
* or equal to arc_c (we enforced this above), which means we
|
|
* can use the simpler of the two equations below:
|
|
*
|
|
* mru + mfu + mru ghost + mfu ghost <= 2 * arc_c
|
|
* mru ghost + mfu ghost <= arc_c
|
|
*/
|
|
target = refcount_count(&arc_mru_ghost->arcs_size) +
|
|
refcount_count(&arc_mfu_ghost->arcs_size) - arc_c;
|
|
|
|
bytes = arc_adjust_impl(arc_mfu_ghost, 0, target, ARC_BUFC_DATA);
|
|
total_evicted += bytes;
|
|
|
|
target -= bytes;
|
|
|
|
total_evicted +=
|
|
arc_adjust_impl(arc_mfu_ghost, 0, target, ARC_BUFC_METADATA);
|
|
|
|
return (total_evicted);
|
|
}
|
|
|
|
void
|
|
arc_flush(spa_t *spa, boolean_t retry)
|
|
{
|
|
uint64_t guid = 0;
|
|
|
|
/*
|
|
* If retry is B_TRUE, a spa must not be specified since we have
|
|
* no good way to determine if all of a spa's buffers have been
|
|
* evicted from an arc state.
|
|
*/
|
|
ASSERT(!retry || spa == 0);
|
|
|
|
if (spa != NULL)
|
|
guid = spa_load_guid(spa);
|
|
|
|
(void) arc_flush_state(arc_mru, guid, ARC_BUFC_DATA, retry);
|
|
(void) arc_flush_state(arc_mru, guid, ARC_BUFC_METADATA, retry);
|
|
|
|
(void) arc_flush_state(arc_mfu, guid, ARC_BUFC_DATA, retry);
|
|
(void) arc_flush_state(arc_mfu, guid, ARC_BUFC_METADATA, retry);
|
|
|
|
(void) arc_flush_state(arc_mru_ghost, guid, ARC_BUFC_DATA, retry);
|
|
(void) arc_flush_state(arc_mru_ghost, guid, ARC_BUFC_METADATA, retry);
|
|
|
|
(void) arc_flush_state(arc_mfu_ghost, guid, ARC_BUFC_DATA, retry);
|
|
(void) arc_flush_state(arc_mfu_ghost, guid, ARC_BUFC_METADATA, retry);
|
|
}
|
|
|
|
void
|
|
arc_shrink(int64_t to_free)
|
|
{
|
|
uint64_t c = arc_c;
|
|
|
|
if (c > to_free && c - to_free > arc_c_min) {
|
|
arc_c = c - to_free;
|
|
atomic_add_64(&arc_p, -(arc_p >> arc_shrink_shift));
|
|
if (arc_c > arc_size)
|
|
arc_c = MAX(arc_size, arc_c_min);
|
|
if (arc_p > arc_c)
|
|
arc_p = (arc_c >> 1);
|
|
ASSERT(arc_c >= arc_c_min);
|
|
ASSERT((int64_t)arc_p >= 0);
|
|
} else {
|
|
arc_c = arc_c_min;
|
|
}
|
|
|
|
if (arc_size > arc_c)
|
|
(void) arc_adjust();
|
|
}
|
|
|
|
/*
|
|
* Return maximum amount of memory that we could possibly use. Reduced
|
|
* to half of all memory in user space which is primarily used for testing.
|
|
*/
|
|
static uint64_t
|
|
arc_all_memory(void)
|
|
{
|
|
#ifdef _KERNEL
|
|
return (MIN(ptob(physmem),
|
|
vmem_size(heap_arena, VMEM_FREE | VMEM_ALLOC)));
|
|
#else
|
|
return (ptob(physmem) / 2);
|
|
#endif
|
|
}
|
|
|
|
typedef enum free_memory_reason_t {
|
|
FMR_UNKNOWN,
|
|
FMR_NEEDFREE,
|
|
FMR_LOTSFREE,
|
|
FMR_SWAPFS_MINFREE,
|
|
FMR_PAGES_PP_MAXIMUM,
|
|
FMR_HEAP_ARENA,
|
|
FMR_ZIO_ARENA,
|
|
} free_memory_reason_t;
|
|
|
|
int64_t last_free_memory;
|
|
free_memory_reason_t last_free_reason;
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Additional reserve of pages for pp_reserve.
|
|
*/
|
|
int64_t arc_pages_pp_reserve = 64;
|
|
|
|
/*
|
|
* Additional reserve of pages for swapfs.
|
|
*/
|
|
int64_t arc_swapfs_reserve = 64;
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* Return the amount of memory that can be consumed before reclaim will be
|
|
* needed. Positive if there is sufficient free memory, negative indicates
|
|
* the amount of memory that needs to be freed up.
|
|
*/
|
|
static int64_t
|
|
arc_available_memory(void)
|
|
{
|
|
int64_t lowest = INT64_MAX;
|
|
free_memory_reason_t r = FMR_UNKNOWN;
|
|
#ifdef _KERNEL
|
|
uint64_t available_memory = ptob(freemem);
|
|
int64_t n;
|
|
#ifdef __linux__
|
|
pgcnt_t needfree = btop(arc_need_free);
|
|
pgcnt_t lotsfree = btop(arc_sys_free);
|
|
pgcnt_t desfree = 0;
|
|
#endif
|
|
|
|
#if defined(__i386)
|
|
available_memory =
|
|
MIN(available_memory, vmem_size(heap_arena, VMEM_FREE));
|
|
#endif
|
|
|
|
if (needfree > 0) {
|
|
n = PAGESIZE * (-needfree);
|
|
if (n < lowest) {
|
|
lowest = n;
|
|
r = FMR_NEEDFREE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* check that we're out of range of the pageout scanner. It starts to
|
|
* schedule paging if freemem is less than lotsfree and needfree.
|
|
* lotsfree is the high-water mark for pageout, and needfree is the
|
|
* number of needed free pages. We add extra pages here to make sure
|
|
* the scanner doesn't start up while we're freeing memory.
|
|
*/
|
|
n = PAGESIZE * (btop(available_memory) - lotsfree - needfree - desfree);
|
|
if (n < lowest) {
|
|
lowest = n;
|
|
r = FMR_LOTSFREE;
|
|
}
|
|
|
|
#ifndef __linux__
|
|
/*
|
|
* check to make sure that swapfs has enough space so that anon
|
|
* reservations can still succeed. anon_resvmem() checks that the
|
|
* availrmem is greater than swapfs_minfree, and the number of reserved
|
|
* swap pages. We also add a bit of extra here just to prevent
|
|
* circumstances from getting really dire.
|
|
*/
|
|
n = PAGESIZE * (availrmem - swapfs_minfree - swapfs_reserve -
|
|
desfree - arc_swapfs_reserve);
|
|
if (n < lowest) {
|
|
lowest = n;
|
|
r = FMR_SWAPFS_MINFREE;
|
|
}
|
|
|
|
|
|
/*
|
|
* Check that we have enough availrmem that memory locking (e.g., via
|
|
* mlock(3C) or memcntl(2)) can still succeed. (pages_pp_maximum
|
|
* stores the number of pages that cannot be locked; when availrmem
|
|
* drops below pages_pp_maximum, page locking mechanisms such as
|
|
* page_pp_lock() will fail.)
|
|
*/
|
|
n = PAGESIZE * (availrmem - pages_pp_maximum -
|
|
arc_pages_pp_reserve);
|
|
if (n < lowest) {
|
|
lowest = n;
|
|
r = FMR_PAGES_PP_MAXIMUM;
|
|
}
|
|
#endif
|
|
|
|
#if defined(__i386)
|
|
/*
|
|
* If we're on an i386 platform, it's possible that we'll exhaust the
|
|
* kernel heap space before we ever run out of available physical
|
|
* memory. Most checks of the size of the heap_area compare against
|
|
* tune.t_minarmem, which is the minimum available real memory that we
|
|
* can have in the system. However, this is generally fixed at 25 pages
|
|
* which is so low that it's useless. In this comparison, we seek to
|
|
* calculate the total heap-size, and reclaim if more than 3/4ths of the
|
|
* heap is allocated. (Or, in the calculation, if less than 1/4th is
|
|
* free)
|
|
*/
|
|
n = vmem_size(heap_arena, VMEM_FREE) -
|
|
(vmem_size(heap_arena, VMEM_FREE | VMEM_ALLOC) >> 2);
|
|
if (n < lowest) {
|
|
lowest = n;
|
|
r = FMR_HEAP_ARENA;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If zio data pages are being allocated out of a separate heap segment,
|
|
* then enforce that the size of available vmem for this arena remains
|
|
* above about 1/4th (1/(2^arc_zio_arena_free_shift)) free.
|
|
*
|
|
* Note that reducing the arc_zio_arena_free_shift keeps more virtual
|
|
* memory (in the zio_arena) free, which can avoid memory
|
|
* fragmentation issues.
|
|
*/
|
|
if (zio_arena != NULL) {
|
|
n = (int64_t)vmem_size(zio_arena, VMEM_FREE) -
|
|
(vmem_size(zio_arena, VMEM_ALLOC) >>
|
|
arc_zio_arena_free_shift);
|
|
if (n < lowest) {
|
|
lowest = n;
|
|
r = FMR_ZIO_ARENA;
|
|
}
|
|
}
|
|
#else /* _KERNEL */
|
|
/* Every 100 calls, free a small amount */
|
|
if (spa_get_random(100) == 0)
|
|
lowest = -1024;
|
|
#endif /* _KERNEL */
|
|
|
|
last_free_memory = lowest;
|
|
last_free_reason = r;
|
|
|
|
return (lowest);
|
|
}
|
|
|
|
/*
|
|
* Determine if the system is under memory pressure and is asking
|
|
* to reclaim memory. A return value of B_TRUE indicates that the system
|
|
* is under memory pressure and that the arc should adjust accordingly.
|
|
*/
|
|
static boolean_t
|
|
arc_reclaim_needed(void)
|
|
{
|
|
return (arc_available_memory() < 0);
|
|
}
|
|
|
|
static void
|
|
arc_kmem_reap_now(void)
|
|
{
|
|
size_t i;
|
|
kmem_cache_t *prev_cache = NULL;
|
|
kmem_cache_t *prev_data_cache = NULL;
|
|
extern kmem_cache_t *zio_buf_cache[];
|
|
extern kmem_cache_t *zio_data_buf_cache[];
|
|
extern kmem_cache_t *range_seg_cache;
|
|
|
|
if ((arc_meta_used >= arc_meta_limit) && zfs_arc_meta_prune) {
|
|
/*
|
|
* We are exceeding our meta-data cache limit.
|
|
* Prune some entries to release holds on meta-data.
|
|
*/
|
|
arc_prune_async(zfs_arc_meta_prune);
|
|
}
|
|
|
|
for (i = 0; i < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; i++) {
|
|
#ifdef _ILP32
|
|
/* reach upper limit of cache size on 32-bit */
|
|
if (zio_buf_cache[i] == NULL)
|
|
break;
|
|
#endif
|
|
if (zio_buf_cache[i] != prev_cache) {
|
|
prev_cache = zio_buf_cache[i];
|
|
kmem_cache_reap_now(zio_buf_cache[i]);
|
|
}
|
|
if (zio_data_buf_cache[i] != prev_data_cache) {
|
|
prev_data_cache = zio_data_buf_cache[i];
|
|
kmem_cache_reap_now(zio_data_buf_cache[i]);
|
|
}
|
|
}
|
|
kmem_cache_reap_now(buf_cache);
|
|
kmem_cache_reap_now(hdr_full_cache);
|
|
kmem_cache_reap_now(hdr_l2only_cache);
|
|
kmem_cache_reap_now(range_seg_cache);
|
|
|
|
if (zio_arena != NULL) {
|
|
/*
|
|
* Ask the vmem arena to reclaim unused memory from its
|
|
* quantum caches.
|
|
*/
|
|
vmem_qcache_reap(zio_arena);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Threads can block in arc_get_data_impl() waiting for this thread to evict
|
|
* enough data and signal them to proceed. When this happens, the threads in
|
|
* arc_get_data_impl() are sleeping while holding the hash lock for their
|
|
* particular arc header. Thus, we must be careful to never sleep on a
|
|
* hash lock in this thread. This is to prevent the following deadlock:
|
|
*
|
|
* - Thread A sleeps on CV in arc_get_data_impl() holding hash lock "L",
|
|
* waiting for the reclaim thread to signal it.
|
|
*
|
|
* - arc_reclaim_thread() tries to acquire hash lock "L" using mutex_enter,
|
|
* fails, and goes to sleep forever.
|
|
*
|
|
* This possible deadlock is avoided by always acquiring a hash lock
|
|
* using mutex_tryenter() from arc_reclaim_thread().
|
|
*/
|
|
static void
|
|
arc_reclaim_thread(void)
|
|
{
|
|
fstrans_cookie_t cookie = spl_fstrans_mark();
|
|
hrtime_t growtime = 0;
|
|
callb_cpr_t cpr;
|
|
|
|
CALLB_CPR_INIT(&cpr, &arc_reclaim_lock, callb_generic_cpr, FTAG);
|
|
|
|
mutex_enter(&arc_reclaim_lock);
|
|
while (!arc_reclaim_thread_exit) {
|
|
int64_t to_free;
|
|
uint64_t evicted = 0;
|
|
uint64_t need_free = arc_need_free;
|
|
arc_tuning_update();
|
|
|
|
/*
|
|
* This is necessary in order for the mdb ::arc dcmd to
|
|
* show up to date information. Since the ::arc command
|
|
* does not call the kstat's update function, without
|
|
* this call, the command may show stale stats for the
|
|
* anon, mru, mru_ghost, mfu, and mfu_ghost lists. Even
|
|
* with this change, the data might be up to 1 second
|
|
* out of date; but that should suffice. The arc_state_t
|
|
* structures can be queried directly if more accurate
|
|
* information is needed.
|
|
*/
|
|
#ifndef __linux__
|
|
if (arc_ksp != NULL)
|
|
arc_ksp->ks_update(arc_ksp, KSTAT_READ);
|
|
#endif
|
|
mutex_exit(&arc_reclaim_lock);
|
|
|
|
/*
|
|
* We call arc_adjust() before (possibly) calling
|
|
* arc_kmem_reap_now(), so that we can wake up
|
|
* arc_get_data_buf() sooner.
|
|
*/
|
|
evicted = arc_adjust();
|
|
|
|
int64_t free_memory = arc_available_memory();
|
|
if (free_memory < 0) {
|
|
|
|
arc_no_grow = B_TRUE;
|
|
arc_warm = B_TRUE;
|
|
|
|
/*
|
|
* Wait at least zfs_grow_retry (default 5) seconds
|
|
* before considering growing.
|
|
*/
|
|
growtime = gethrtime() + SEC2NSEC(arc_grow_retry);
|
|
|
|
arc_kmem_reap_now();
|
|
|
|
/*
|
|
* If we are still low on memory, shrink the ARC
|
|
* so that we have arc_shrink_min free space.
|
|
*/
|
|
free_memory = arc_available_memory();
|
|
|
|
to_free = (arc_c >> arc_shrink_shift) - free_memory;
|
|
if (to_free > 0) {
|
|
#ifdef _KERNEL
|
|
to_free = MAX(to_free, need_free);
|
|
#endif
|
|
arc_shrink(to_free);
|
|
}
|
|
} else if (free_memory < arc_c >> arc_no_grow_shift) {
|
|
arc_no_grow = B_TRUE;
|
|
} else if (gethrtime() >= growtime) {
|
|
arc_no_grow = B_FALSE;
|
|
}
|
|
|
|
mutex_enter(&arc_reclaim_lock);
|
|
|
|
/*
|
|
* If evicted is zero, we couldn't evict anything via
|
|
* arc_adjust(). This could be due to hash lock
|
|
* collisions, but more likely due to the majority of
|
|
* arc buffers being unevictable. Therefore, even if
|
|
* arc_size is above arc_c, another pass is unlikely to
|
|
* be helpful and could potentially cause us to enter an
|
|
* infinite loop.
|
|
*/
|
|
if (arc_size <= arc_c || evicted == 0) {
|
|
/*
|
|
* We're either no longer overflowing, or we
|
|
* can't evict anything more, so we should wake
|
|
* up any threads before we go to sleep and remove
|
|
* the bytes we were working on from arc_need_free
|
|
* since nothing more will be done here.
|
|
*/
|
|
cv_broadcast(&arc_reclaim_waiters_cv);
|
|
ARCSTAT_INCR(arcstat_need_free, -need_free);
|
|
|
|
/*
|
|
* Block until signaled, or after one second (we
|
|
* might need to perform arc_kmem_reap_now()
|
|
* even if we aren't being signalled)
|
|
*/
|
|
CALLB_CPR_SAFE_BEGIN(&cpr);
|
|
(void) cv_timedwait_sig_hires(&arc_reclaim_thread_cv,
|
|
&arc_reclaim_lock, SEC2NSEC(1), MSEC2NSEC(1), 0);
|
|
CALLB_CPR_SAFE_END(&cpr, &arc_reclaim_lock);
|
|
}
|
|
}
|
|
|
|
arc_reclaim_thread_exit = B_FALSE;
|
|
cv_broadcast(&arc_reclaim_thread_cv);
|
|
CALLB_CPR_EXIT(&cpr); /* drops arc_reclaim_lock */
|
|
spl_fstrans_unmark(cookie);
|
|
thread_exit();
|
|
}
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Determine the amount of memory eligible for eviction contained in the
|
|
* ARC. All clean data reported by the ghost lists can always be safely
|
|
* evicted. Due to arc_c_min, the same does not hold for all clean data
|
|
* contained by the regular mru and mfu lists.
|
|
*
|
|
* In the case of the regular mru and mfu lists, we need to report as
|
|
* much clean data as possible, such that evicting that same reported
|
|
* data will not bring arc_size below arc_c_min. Thus, in certain
|
|
* circumstances, the total amount of clean data in the mru and mfu
|
|
* lists might not actually be evictable.
|
|
*
|
|
* The following two distinct cases are accounted for:
|
|
*
|
|
* 1. The sum of the amount of dirty data contained by both the mru and
|
|
* mfu lists, plus the ARC's other accounting (e.g. the anon list),
|
|
* is greater than or equal to arc_c_min.
|
|
* (i.e. amount of dirty data >= arc_c_min)
|
|
*
|
|
* This is the easy case; all clean data contained by the mru and mfu
|
|
* lists is evictable. Evicting all clean data can only drop arc_size
|
|
* to the amount of dirty data, which is greater than arc_c_min.
|
|
*
|
|
* 2. The sum of the amount of dirty data contained by both the mru and
|
|
* mfu lists, plus the ARC's other accounting (e.g. the anon list),
|
|
* is less than arc_c_min.
|
|
* (i.e. arc_c_min > amount of dirty data)
|
|
*
|
|
* 2.1. arc_size is greater than or equal arc_c_min.
|
|
* (i.e. arc_size >= arc_c_min > amount of dirty data)
|
|
*
|
|
* In this case, not all clean data from the regular mru and mfu
|
|
* lists is actually evictable; we must leave enough clean data
|
|
* to keep arc_size above arc_c_min. Thus, the maximum amount of
|
|
* evictable data from the two lists combined, is exactly the
|
|
* difference between arc_size and arc_c_min.
|
|
*
|
|
* 2.2. arc_size is less than arc_c_min
|
|
* (i.e. arc_c_min > arc_size > amount of dirty data)
|
|
*
|
|
* In this case, none of the data contained in the mru and mfu
|
|
* lists is evictable, even if it's clean. Since arc_size is
|
|
* already below arc_c_min, evicting any more would only
|
|
* increase this negative difference.
|
|
*/
|
|
static uint64_t
|
|
arc_evictable_memory(void)
|
|
{
|
|
uint64_t arc_clean =
|
|
refcount_count(&arc_mru->arcs_esize[ARC_BUFC_DATA]) +
|
|
refcount_count(&arc_mru->arcs_esize[ARC_BUFC_METADATA]) +
|
|
refcount_count(&arc_mfu->arcs_esize[ARC_BUFC_DATA]) +
|
|
refcount_count(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
|
|
uint64_t arc_dirty = MAX((int64_t)arc_size - (int64_t)arc_clean, 0);
|
|
|
|
/*
|
|
* Scale reported evictable memory in proportion to page cache, cap
|
|
* at specified min/max.
|
|
*/
|
|
uint64_t min = (ptob(global_page_state(NR_FILE_PAGES)) / 100) *
|
|
zfs_arc_pc_percent;
|
|
min = MAX(arc_c_min, MIN(arc_c_max, min));
|
|
|
|
if (arc_dirty >= min)
|
|
return (arc_clean);
|
|
|
|
return (MAX((int64_t)arc_size - (int64_t)min, 0));
|
|
}
|
|
|
|
/*
|
|
* If sc->nr_to_scan is zero, the caller is requesting a query of the
|
|
* number of objects which can potentially be freed. If it is nonzero,
|
|
* the request is to free that many objects.
|
|
*
|
|
* Linux kernels >= 3.12 have the count_objects and scan_objects callbacks
|
|
* in struct shrinker and also require the shrinker to return the number
|
|
* of objects freed.
|
|
*
|
|
* Older kernels require the shrinker to return the number of freeable
|
|
* objects following the freeing of nr_to_free.
|
|
*/
|
|
static spl_shrinker_t
|
|
__arc_shrinker_func(struct shrinker *shrink, struct shrink_control *sc)
|
|
{
|
|
int64_t pages;
|
|
|
|
/* The arc is considered warm once reclaim has occurred */
|
|
if (unlikely(arc_warm == B_FALSE))
|
|
arc_warm = B_TRUE;
|
|
|
|
/* Return the potential number of reclaimable pages */
|
|
pages = btop((int64_t)arc_evictable_memory());
|
|
if (sc->nr_to_scan == 0)
|
|
return (pages);
|
|
|
|
/* Not allowed to perform filesystem reclaim */
|
|
if (!(sc->gfp_mask & __GFP_FS))
|
|
return (SHRINK_STOP);
|
|
|
|
/* Reclaim in progress */
|
|
if (mutex_tryenter(&arc_reclaim_lock) == 0) {
|
|
ARCSTAT_INCR(arcstat_need_free, ptob(sc->nr_to_scan));
|
|
return (0);
|
|
}
|
|
|
|
mutex_exit(&arc_reclaim_lock);
|
|
|
|
/*
|
|
* Evict the requested number of pages by shrinking arc_c the
|
|
* requested amount.
|
|
*/
|
|
if (pages > 0) {
|
|
arc_shrink(ptob(sc->nr_to_scan));
|
|
if (current_is_kswapd())
|
|
arc_kmem_reap_now();
|
|
#ifdef HAVE_SPLIT_SHRINKER_CALLBACK
|
|
pages = MAX((int64_t)pages -
|
|
(int64_t)btop(arc_evictable_memory()), 0);
|
|
#else
|
|
pages = btop(arc_evictable_memory());
|
|
#endif
|
|
/*
|
|
* We've shrunk what we can, wake up threads.
|
|
*/
|
|
cv_broadcast(&arc_reclaim_waiters_cv);
|
|
} else
|
|
pages = SHRINK_STOP;
|
|
|
|
/*
|
|
* When direct reclaim is observed it usually indicates a rapid
|
|
* increase in memory pressure. This occurs because the kswapd
|
|
* threads were unable to asynchronously keep enough free memory
|
|
* available. In this case set arc_no_grow to briefly pause arc
|
|
* growth to avoid compounding the memory pressure.
|
|
*/
|
|
if (current_is_kswapd()) {
|
|
ARCSTAT_BUMP(arcstat_memory_indirect_count);
|
|
} else {
|
|
arc_no_grow = B_TRUE;
|
|
arc_kmem_reap_now();
|
|
ARCSTAT_BUMP(arcstat_memory_direct_count);
|
|
}
|
|
|
|
return (pages);
|
|
}
|
|
SPL_SHRINKER_CALLBACK_WRAPPER(arc_shrinker_func);
|
|
|
|
SPL_SHRINKER_DECLARE(arc_shrinker, arc_shrinker_func, DEFAULT_SEEKS);
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* Adapt arc info given the number of bytes we are trying to add and
|
|
* the state that we are coming from. This function is only called
|
|
* when we are adding new content to the cache.
|
|
*/
|
|
static void
|
|
arc_adapt(int bytes, arc_state_t *state)
|
|
{
|
|
int mult;
|
|
uint64_t arc_p_min = (arc_c >> arc_p_min_shift);
|
|
int64_t mrug_size = refcount_count(&arc_mru_ghost->arcs_size);
|
|
int64_t mfug_size = refcount_count(&arc_mfu_ghost->arcs_size);
|
|
|
|
if (state == arc_l2c_only)
|
|
return;
|
|
|
|
ASSERT(bytes > 0);
|
|
/*
|
|
* Adapt the target size of the MRU list:
|
|
* - if we just hit in the MRU ghost list, then increase
|
|
* the target size of the MRU list.
|
|
* - if we just hit in the MFU ghost list, then increase
|
|
* the target size of the MFU list by decreasing the
|
|
* target size of the MRU list.
|
|
*/
|
|
if (state == arc_mru_ghost) {
|
|
mult = (mrug_size >= mfug_size) ? 1 : (mfug_size / mrug_size);
|
|
if (!zfs_arc_p_dampener_disable)
|
|
mult = MIN(mult, 10); /* avoid wild arc_p adjustment */
|
|
|
|
arc_p = MIN(arc_c - arc_p_min, arc_p + bytes * mult);
|
|
} else if (state == arc_mfu_ghost) {
|
|
uint64_t delta;
|
|
|
|
mult = (mfug_size >= mrug_size) ? 1 : (mrug_size / mfug_size);
|
|
if (!zfs_arc_p_dampener_disable)
|
|
mult = MIN(mult, 10);
|
|
|
|
delta = MIN(bytes * mult, arc_p);
|
|
arc_p = MAX(arc_p_min, arc_p - delta);
|
|
}
|
|
ASSERT((int64_t)arc_p >= 0);
|
|
|
|
if (arc_reclaim_needed()) {
|
|
cv_signal(&arc_reclaim_thread_cv);
|
|
return;
|
|
}
|
|
|
|
if (arc_no_grow)
|
|
return;
|
|
|
|
if (arc_c >= arc_c_max)
|
|
return;
|
|
|
|
/*
|
|
* If we're within (2 * maxblocksize) bytes of the target
|
|
* cache size, increment the target cache size
|
|
*/
|
|
ASSERT3U(arc_c, >=, 2ULL << SPA_MAXBLOCKSHIFT);
|
|
if (arc_size >= arc_c - (2ULL << SPA_MAXBLOCKSHIFT)) {
|
|
atomic_add_64(&arc_c, (int64_t)bytes);
|
|
if (arc_c > arc_c_max)
|
|
arc_c = arc_c_max;
|
|
else if (state == arc_anon)
|
|
atomic_add_64(&arc_p, (int64_t)bytes);
|
|
if (arc_p > arc_c)
|
|
arc_p = arc_c;
|
|
}
|
|
ASSERT((int64_t)arc_p >= 0);
|
|
}
|
|
|
|
/*
|
|
* Check if arc_size has grown past our upper threshold, determined by
|
|
* zfs_arc_overflow_shift.
|
|
*/
|
|
static boolean_t
|
|
arc_is_overflowing(void)
|
|
{
|
|
/* Always allow at least one block of overflow */
|
|
uint64_t overflow = MAX(SPA_MAXBLOCKSIZE,
|
|
arc_c >> zfs_arc_overflow_shift);
|
|
|
|
return (arc_size >= arc_c + overflow);
|
|
}
|
|
|
|
static abd_t *
|
|
arc_get_data_abd(arc_buf_hdr_t *hdr, uint64_t size, void *tag)
|
|
{
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
|
|
arc_get_data_impl(hdr, size, tag);
|
|
if (type == ARC_BUFC_METADATA) {
|
|
return (abd_alloc(size, B_TRUE));
|
|
} else {
|
|
ASSERT(type == ARC_BUFC_DATA);
|
|
return (abd_alloc(size, B_FALSE));
|
|
}
|
|
}
|
|
|
|
static void *
|
|
arc_get_data_buf(arc_buf_hdr_t *hdr, uint64_t size, void *tag)
|
|
{
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
|
|
arc_get_data_impl(hdr, size, tag);
|
|
if (type == ARC_BUFC_METADATA) {
|
|
return (zio_buf_alloc(size));
|
|
} else {
|
|
ASSERT(type == ARC_BUFC_DATA);
|
|
return (zio_data_buf_alloc(size));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocate a block and return it to the caller. If we are hitting the
|
|
* hard limit for the cache size, we must sleep, waiting for the eviction
|
|
* thread to catch up. If we're past the target size but below the hard
|
|
* limit, we'll only signal the reclaim thread and continue on.
|
|
*/
|
|
static void
|
|
arc_get_data_impl(arc_buf_hdr_t *hdr, uint64_t size, void *tag)
|
|
{
|
|
arc_state_t *state = hdr->b_l1hdr.b_state;
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
|
|
arc_adapt(size, state);
|
|
|
|
/*
|
|
* If arc_size is currently overflowing, and has grown past our
|
|
* upper limit, we must be adding data faster than the evict
|
|
* thread can evict. Thus, to ensure we don't compound the
|
|
* problem by adding more data and forcing arc_size to grow even
|
|
* further past it's target size, we halt and wait for the
|
|
* eviction thread to catch up.
|
|
*
|
|
* It's also possible that the reclaim thread is unable to evict
|
|
* enough buffers to get arc_size below the overflow limit (e.g.
|
|
* due to buffers being un-evictable, or hash lock collisions).
|
|
* In this case, we want to proceed regardless if we're
|
|
* overflowing; thus we don't use a while loop here.
|
|
*/
|
|
if (arc_is_overflowing()) {
|
|
mutex_enter(&arc_reclaim_lock);
|
|
|
|
/*
|
|
* Now that we've acquired the lock, we may no longer be
|
|
* over the overflow limit, lets check.
|
|
*
|
|
* We're ignoring the case of spurious wake ups. If that
|
|
* were to happen, it'd let this thread consume an ARC
|
|
* buffer before it should have (i.e. before we're under
|
|
* the overflow limit and were signalled by the reclaim
|
|
* thread). As long as that is a rare occurrence, it
|
|
* shouldn't cause any harm.
|
|
*/
|
|
if (arc_is_overflowing()) {
|
|
cv_signal(&arc_reclaim_thread_cv);
|
|
cv_wait(&arc_reclaim_waiters_cv, &arc_reclaim_lock);
|
|
}
|
|
|
|
mutex_exit(&arc_reclaim_lock);
|
|
}
|
|
|
|
VERIFY3U(hdr->b_type, ==, type);
|
|
if (type == ARC_BUFC_METADATA) {
|
|
arc_space_consume(size, ARC_SPACE_META);
|
|
} else {
|
|
arc_space_consume(size, ARC_SPACE_DATA);
|
|
}
|
|
|
|
/*
|
|
* Update the state size. Note that ghost states have a
|
|
* "ghost size" and so don't need to be updated.
|
|
*/
|
|
if (!GHOST_STATE(state)) {
|
|
|
|
(void) refcount_add_many(&state->arcs_size, size, tag);
|
|
|
|
/*
|
|
* If this is reached via arc_read, the link is
|
|
* protected by the hash lock. If reached via
|
|
* arc_buf_alloc, the header should not be accessed by
|
|
* any other thread. And, if reached via arc_read_done,
|
|
* the hash lock will protect it if it's found in the
|
|
* hash table; otherwise no other thread should be
|
|
* trying to [add|remove]_reference it.
|
|
*/
|
|
if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
(void) refcount_add_many(&state->arcs_esize[type],
|
|
size, tag);
|
|
}
|
|
|
|
/*
|
|
* If we are growing the cache, and we are adding anonymous
|
|
* data, and we have outgrown arc_p, update arc_p
|
|
*/
|
|
if (arc_size < arc_c && hdr->b_l1hdr.b_state == arc_anon &&
|
|
(refcount_count(&arc_anon->arcs_size) +
|
|
refcount_count(&arc_mru->arcs_size) > arc_p))
|
|
arc_p = MIN(arc_c, arc_p + size);
|
|
}
|
|
}
|
|
|
|
static void
|
|
arc_free_data_abd(arc_buf_hdr_t *hdr, abd_t *abd, uint64_t size, void *tag)
|
|
{
|
|
arc_free_data_impl(hdr, size, tag);
|
|
abd_free(abd);
|
|
}
|
|
|
|
static void
|
|
arc_free_data_buf(arc_buf_hdr_t *hdr, void *buf, uint64_t size, void *tag)
|
|
{
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
|
|
arc_free_data_impl(hdr, size, tag);
|
|
if (type == ARC_BUFC_METADATA) {
|
|
zio_buf_free(buf, size);
|
|
} else {
|
|
ASSERT(type == ARC_BUFC_DATA);
|
|
zio_data_buf_free(buf, size);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free the arc data buffer.
|
|
*/
|
|
static void
|
|
arc_free_data_impl(arc_buf_hdr_t *hdr, uint64_t size, void *tag)
|
|
{
|
|
arc_state_t *state = hdr->b_l1hdr.b_state;
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
|
|
/* protected by hash lock, if in the hash table */
|
|
if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
ASSERT(state != arc_anon && state != arc_l2c_only);
|
|
|
|
(void) refcount_remove_many(&state->arcs_esize[type],
|
|
size, tag);
|
|
}
|
|
(void) refcount_remove_many(&state->arcs_size, size, tag);
|
|
|
|
VERIFY3U(hdr->b_type, ==, type);
|
|
if (type == ARC_BUFC_METADATA) {
|
|
arc_space_return(size, ARC_SPACE_META);
|
|
} else {
|
|
ASSERT(type == ARC_BUFC_DATA);
|
|
arc_space_return(size, ARC_SPACE_DATA);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This routine is called whenever a buffer is accessed.
|
|
* NOTE: the hash lock is dropped in this function.
|
|
*/
|
|
static void
|
|
arc_access(arc_buf_hdr_t *hdr, kmutex_t *hash_lock)
|
|
{
|
|
clock_t now;
|
|
|
|
ASSERT(MUTEX_HELD(hash_lock));
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
if (hdr->b_l1hdr.b_state == arc_anon) {
|
|
/*
|
|
* This buffer is not in the cache, and does not
|
|
* appear in our "ghost" list. Add the new buffer
|
|
* to the MRU state.
|
|
*/
|
|
|
|
ASSERT0(hdr->b_l1hdr.b_arc_access);
|
|
hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
|
|
DTRACE_PROBE1(new_state__mru, arc_buf_hdr_t *, hdr);
|
|
arc_change_state(arc_mru, hdr, hash_lock);
|
|
|
|
} else if (hdr->b_l1hdr.b_state == arc_mru) {
|
|
now = ddi_get_lbolt();
|
|
|
|
/*
|
|
* If this buffer is here because of a prefetch, then either:
|
|
* - clear the flag if this is a "referencing" read
|
|
* (any subsequent access will bump this into the MFU state).
|
|
* or
|
|
* - move the buffer to the head of the list if this is
|
|
* another prefetch (to make it less likely to be evicted).
|
|
*/
|
|
if (HDR_PREFETCH(hdr)) {
|
|
if (refcount_count(&hdr->b_l1hdr.b_refcnt) == 0) {
|
|
/* link protected by hash lock */
|
|
ASSERT(multilist_link_active(
|
|
&hdr->b_l1hdr.b_arc_node));
|
|
} else {
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_PREFETCH);
|
|
atomic_inc_32(&hdr->b_l1hdr.b_mru_hits);
|
|
ARCSTAT_BUMP(arcstat_mru_hits);
|
|
}
|
|
hdr->b_l1hdr.b_arc_access = now;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* This buffer has been "accessed" only once so far,
|
|
* but it is still in the cache. Move it to the MFU
|
|
* state.
|
|
*/
|
|
if (ddi_time_after(now, hdr->b_l1hdr.b_arc_access +
|
|
ARC_MINTIME)) {
|
|
/*
|
|
* More than 125ms have passed since we
|
|
* instantiated this buffer. Move it to the
|
|
* most frequently used state.
|
|
*/
|
|
hdr->b_l1hdr.b_arc_access = now;
|
|
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, hdr);
|
|
arc_change_state(arc_mfu, hdr, hash_lock);
|
|
}
|
|
atomic_inc_32(&hdr->b_l1hdr.b_mru_hits);
|
|
ARCSTAT_BUMP(arcstat_mru_hits);
|
|
} else if (hdr->b_l1hdr.b_state == arc_mru_ghost) {
|
|
arc_state_t *new_state;
|
|
/*
|
|
* This buffer has been "accessed" recently, but
|
|
* was evicted from the cache. Move it to the
|
|
* MFU state.
|
|
*/
|
|
|
|
if (HDR_PREFETCH(hdr)) {
|
|
new_state = arc_mru;
|
|
if (refcount_count(&hdr->b_l1hdr.b_refcnt) > 0)
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_PREFETCH);
|
|
DTRACE_PROBE1(new_state__mru, arc_buf_hdr_t *, hdr);
|
|
} else {
|
|
new_state = arc_mfu;
|
|
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, hdr);
|
|
}
|
|
|
|
hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
|
|
arc_change_state(new_state, hdr, hash_lock);
|
|
|
|
atomic_inc_32(&hdr->b_l1hdr.b_mru_ghost_hits);
|
|
ARCSTAT_BUMP(arcstat_mru_ghost_hits);
|
|
} else if (hdr->b_l1hdr.b_state == arc_mfu) {
|
|
/*
|
|
* This buffer has been accessed more than once and is
|
|
* still in the cache. Keep it in the MFU state.
|
|
*
|
|
* NOTE: an add_reference() that occurred when we did
|
|
* the arc_read() will have kicked this off the list.
|
|
* If it was a prefetch, we will explicitly move it to
|
|
* the head of the list now.
|
|
*/
|
|
if ((HDR_PREFETCH(hdr)) != 0) {
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
/* link protected by hash_lock */
|
|
ASSERT(multilist_link_active(&hdr->b_l1hdr.b_arc_node));
|
|
}
|
|
atomic_inc_32(&hdr->b_l1hdr.b_mfu_hits);
|
|
ARCSTAT_BUMP(arcstat_mfu_hits);
|
|
hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
|
|
} else if (hdr->b_l1hdr.b_state == arc_mfu_ghost) {
|
|
arc_state_t *new_state = arc_mfu;
|
|
/*
|
|
* This buffer has been accessed more than once but has
|
|
* been evicted from the cache. Move it back to the
|
|
* MFU state.
|
|
*/
|
|
|
|
if (HDR_PREFETCH(hdr)) {
|
|
/*
|
|
* This is a prefetch access...
|
|
* move this block back to the MRU state.
|
|
*/
|
|
ASSERT0(refcount_count(&hdr->b_l1hdr.b_refcnt));
|
|
new_state = arc_mru;
|
|
}
|
|
|
|
hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
|
|
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, hdr);
|
|
arc_change_state(new_state, hdr, hash_lock);
|
|
|
|
atomic_inc_32(&hdr->b_l1hdr.b_mfu_ghost_hits);
|
|
ARCSTAT_BUMP(arcstat_mfu_ghost_hits);
|
|
} else if (hdr->b_l1hdr.b_state == arc_l2c_only) {
|
|
/*
|
|
* This buffer is on the 2nd Level ARC.
|
|
*/
|
|
|
|
hdr->b_l1hdr.b_arc_access = ddi_get_lbolt();
|
|
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, hdr);
|
|
arc_change_state(arc_mfu, hdr, hash_lock);
|
|
} else {
|
|
cmn_err(CE_PANIC, "invalid arc state 0x%p",
|
|
hdr->b_l1hdr.b_state);
|
|
}
|
|
}
|
|
|
|
/* a generic arc_done_func_t which you can use */
|
|
/* ARGSUSED */
|
|
void
|
|
arc_bcopy_func(zio_t *zio, arc_buf_t *buf, void *arg)
|
|
{
|
|
if (zio == NULL || zio->io_error == 0)
|
|
bcopy(buf->b_data, arg, arc_buf_size(buf));
|
|
arc_buf_destroy(buf, arg);
|
|
}
|
|
|
|
/* a generic arc_done_func_t */
|
|
void
|
|
arc_getbuf_func(zio_t *zio, arc_buf_t *buf, void *arg)
|
|
{
|
|
arc_buf_t **bufp = arg;
|
|
if (zio && zio->io_error) {
|
|
arc_buf_destroy(buf, arg);
|
|
*bufp = NULL;
|
|
} else {
|
|
*bufp = buf;
|
|
ASSERT(buf->b_data);
|
|
}
|
|
}
|
|
|
|
static void
|
|
arc_hdr_verify(arc_buf_hdr_t *hdr, blkptr_t *bp)
|
|
{
|
|
if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) {
|
|
ASSERT3U(HDR_GET_PSIZE(hdr), ==, 0);
|
|
ASSERT3U(HDR_GET_COMPRESS(hdr), ==, ZIO_COMPRESS_OFF);
|
|
} else {
|
|
if (HDR_COMPRESSION_ENABLED(hdr)) {
|
|
ASSERT3U(HDR_GET_COMPRESS(hdr), ==,
|
|
BP_GET_COMPRESS(bp));
|
|
}
|
|
ASSERT3U(HDR_GET_LSIZE(hdr), ==, BP_GET_LSIZE(bp));
|
|
ASSERT3U(HDR_GET_PSIZE(hdr), ==, BP_GET_PSIZE(bp));
|
|
}
|
|
}
|
|
|
|
static void
|
|
arc_read_done(zio_t *zio)
|
|
{
|
|
arc_buf_hdr_t *hdr = zio->io_private;
|
|
kmutex_t *hash_lock = NULL;
|
|
arc_callback_t *callback_list;
|
|
arc_callback_t *acb;
|
|
boolean_t freeable = B_FALSE;
|
|
boolean_t no_zio_error = (zio->io_error == 0);
|
|
|
|
/*
|
|
* The hdr was inserted into hash-table and removed from lists
|
|
* prior to starting I/O. We should find this header, since
|
|
* it's in the hash table, and it should be legit since it's
|
|
* not possible to evict it during the I/O. The only possible
|
|
* reason for it not to be found is if we were freed during the
|
|
* read.
|
|
*/
|
|
if (HDR_IN_HASH_TABLE(hdr)) {
|
|
arc_buf_hdr_t *found;
|
|
|
|
ASSERT3U(hdr->b_birth, ==, BP_PHYSICAL_BIRTH(zio->io_bp));
|
|
ASSERT3U(hdr->b_dva.dva_word[0], ==,
|
|
BP_IDENTITY(zio->io_bp)->dva_word[0]);
|
|
ASSERT3U(hdr->b_dva.dva_word[1], ==,
|
|
BP_IDENTITY(zio->io_bp)->dva_word[1]);
|
|
|
|
found = buf_hash_find(hdr->b_spa, zio->io_bp, &hash_lock);
|
|
|
|
ASSERT((found == hdr &&
|
|
DVA_EQUAL(&hdr->b_dva, BP_IDENTITY(zio->io_bp))) ||
|
|
(found == hdr && HDR_L2_READING(hdr)));
|
|
ASSERT3P(hash_lock, !=, NULL);
|
|
}
|
|
|
|
if (no_zio_error) {
|
|
/* byteswap if necessary */
|
|
if (BP_SHOULD_BYTESWAP(zio->io_bp)) {
|
|
if (BP_GET_LEVEL(zio->io_bp) > 0) {
|
|
hdr->b_l1hdr.b_byteswap = DMU_BSWAP_UINT64;
|
|
} else {
|
|
hdr->b_l1hdr.b_byteswap =
|
|
DMU_OT_BYTESWAP(BP_GET_TYPE(zio->io_bp));
|
|
}
|
|
} else {
|
|
hdr->b_l1hdr.b_byteswap = DMU_BSWAP_NUMFUNCS;
|
|
}
|
|
}
|
|
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_L2_EVICTED);
|
|
if (l2arc_noprefetch && HDR_PREFETCH(hdr))
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_L2CACHE);
|
|
|
|
callback_list = hdr->b_l1hdr.b_acb;
|
|
ASSERT3P(callback_list, !=, NULL);
|
|
|
|
if (hash_lock && no_zio_error && hdr->b_l1hdr.b_state == arc_anon) {
|
|
/*
|
|
* Only call arc_access on anonymous buffers. This is because
|
|
* if we've issued an I/O for an evicted buffer, we've already
|
|
* called arc_access (to prevent any simultaneous readers from
|
|
* getting confused).
|
|
*/
|
|
arc_access(hdr, hash_lock);
|
|
}
|
|
|
|
/*
|
|
* If a read request has a callback (i.e. acb_done is not NULL), then we
|
|
* make a buf containing the data according to the parameters which were
|
|
* passed in. The implementation of arc_buf_alloc_impl() ensures that we
|
|
* aren't needlessly decompressing the data multiple times.
|
|
*/
|
|
int callback_cnt = 0;
|
|
for (acb = callback_list; acb != NULL; acb = acb->acb_next) {
|
|
if (!acb->acb_done)
|
|
continue;
|
|
|
|
/* This is a demand read since prefetches don't use callbacks */
|
|
callback_cnt++;
|
|
|
|
int error = arc_buf_alloc_impl(hdr, acb->acb_private,
|
|
acb->acb_compressed, no_zio_error, &acb->acb_buf);
|
|
if (no_zio_error) {
|
|
zio->io_error = error;
|
|
}
|
|
}
|
|
hdr->b_l1hdr.b_acb = NULL;
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
|
|
if (callback_cnt == 0) {
|
|
ASSERT(HDR_PREFETCH(hdr));
|
|
ASSERT0(hdr->b_l1hdr.b_bufcnt);
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
}
|
|
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt) ||
|
|
callback_list != NULL);
|
|
|
|
if (no_zio_error) {
|
|
arc_hdr_verify(hdr, zio->io_bp);
|
|
} else {
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_IO_ERROR);
|
|
if (hdr->b_l1hdr.b_state != arc_anon)
|
|
arc_change_state(arc_anon, hdr, hash_lock);
|
|
if (HDR_IN_HASH_TABLE(hdr))
|
|
buf_hash_remove(hdr);
|
|
freeable = refcount_is_zero(&hdr->b_l1hdr.b_refcnt);
|
|
}
|
|
|
|
/*
|
|
* Broadcast before we drop the hash_lock to avoid the possibility
|
|
* that the hdr (and hence the cv) might be freed before we get to
|
|
* the cv_broadcast().
|
|
*/
|
|
cv_broadcast(&hdr->b_l1hdr.b_cv);
|
|
|
|
if (hash_lock != NULL) {
|
|
mutex_exit(hash_lock);
|
|
} else {
|
|
/*
|
|
* This block was freed while we waited for the read to
|
|
* complete. It has been removed from the hash table and
|
|
* moved to the anonymous state (so that it won't show up
|
|
* in the cache).
|
|
*/
|
|
ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
|
|
freeable = refcount_is_zero(&hdr->b_l1hdr.b_refcnt);
|
|
}
|
|
|
|
/* execute each callback and free its structure */
|
|
while ((acb = callback_list) != NULL) {
|
|
if (acb->acb_done)
|
|
acb->acb_done(zio, acb->acb_buf, acb->acb_private);
|
|
|
|
if (acb->acb_zio_dummy != NULL) {
|
|
acb->acb_zio_dummy->io_error = zio->io_error;
|
|
zio_nowait(acb->acb_zio_dummy);
|
|
}
|
|
|
|
callback_list = acb->acb_next;
|
|
kmem_free(acb, sizeof (arc_callback_t));
|
|
}
|
|
|
|
if (freeable)
|
|
arc_hdr_destroy(hdr);
|
|
}
|
|
|
|
/*
|
|
* "Read" the block at the specified DVA (in bp) via the
|
|
* cache. If the block is found in the cache, invoke the provided
|
|
* callback immediately and return. Note that the `zio' parameter
|
|
* in the callback will be NULL in this case, since no IO was
|
|
* required. If the block is not in the cache pass the read request
|
|
* on to the spa with a substitute callback function, so that the
|
|
* requested block will be added to the cache.
|
|
*
|
|
* If a read request arrives for a block that has a read in-progress,
|
|
* either wait for the in-progress read to complete (and return the
|
|
* results); or, if this is a read with a "done" func, add a record
|
|
* to the read to invoke the "done" func when the read completes,
|
|
* and return; or just return.
|
|
*
|
|
* arc_read_done() will invoke all the requested "done" functions
|
|
* for readers of this block.
|
|
*/
|
|
int
|
|
arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, arc_done_func_t *done,
|
|
void *private, zio_priority_t priority, int zio_flags,
|
|
arc_flags_t *arc_flags, const zbookmark_phys_t *zb)
|
|
{
|
|
arc_buf_hdr_t *hdr = NULL;
|
|
kmutex_t *hash_lock = NULL;
|
|
zio_t *rzio;
|
|
uint64_t guid = spa_load_guid(spa);
|
|
boolean_t compressed_read = (zio_flags & ZIO_FLAG_RAW) != 0;
|
|
int rc = 0;
|
|
|
|
ASSERT(!BP_IS_EMBEDDED(bp) ||
|
|
BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA);
|
|
|
|
top:
|
|
if (!BP_IS_EMBEDDED(bp)) {
|
|
/*
|
|
* Embedded BP's have no DVA and require no I/O to "read".
|
|
* Create an anonymous arc buf to back it.
|
|
*/
|
|
hdr = buf_hash_find(guid, bp, &hash_lock);
|
|
}
|
|
|
|
if (hdr != NULL && HDR_HAS_L1HDR(hdr) && hdr->b_l1hdr.b_pabd != NULL) {
|
|
arc_buf_t *buf = NULL;
|
|
*arc_flags |= ARC_FLAG_CACHED;
|
|
|
|
if (HDR_IO_IN_PROGRESS(hdr)) {
|
|
|
|
if ((hdr->b_flags & ARC_FLAG_PRIO_ASYNC_READ) &&
|
|
priority == ZIO_PRIORITY_SYNC_READ) {
|
|
/*
|
|
* This sync read must wait for an
|
|
* in-progress async read (e.g. a predictive
|
|
* prefetch). Async reads are queued
|
|
* separately at the vdev_queue layer, so
|
|
* this is a form of priority inversion.
|
|
* Ideally, we would "inherit" the demand
|
|
* i/o's priority by moving the i/o from
|
|
* the async queue to the synchronous queue,
|
|
* but there is currently no mechanism to do
|
|
* so. Track this so that we can evaluate
|
|
* the magnitude of this potential performance
|
|
* problem.
|
|
*
|
|
* Note that if the prefetch i/o is already
|
|
* active (has been issued to the device),
|
|
* the prefetch improved performance, because
|
|
* we issued it sooner than we would have
|
|
* without the prefetch.
|
|
*/
|
|
DTRACE_PROBE1(arc__sync__wait__for__async,
|
|
arc_buf_hdr_t *, hdr);
|
|
ARCSTAT_BUMP(arcstat_sync_wait_for_async);
|
|
}
|
|
if (hdr->b_flags & ARC_FLAG_PREDICTIVE_PREFETCH) {
|
|
arc_hdr_clear_flags(hdr,
|
|
ARC_FLAG_PREDICTIVE_PREFETCH);
|
|
}
|
|
|
|
if (*arc_flags & ARC_FLAG_WAIT) {
|
|
cv_wait(&hdr->b_l1hdr.b_cv, hash_lock);
|
|
mutex_exit(hash_lock);
|
|
goto top;
|
|
}
|
|
ASSERT(*arc_flags & ARC_FLAG_NOWAIT);
|
|
|
|
if (done) {
|
|
arc_callback_t *acb = NULL;
|
|
|
|
acb = kmem_zalloc(sizeof (arc_callback_t),
|
|
KM_SLEEP);
|
|
acb->acb_done = done;
|
|
acb->acb_private = private;
|
|
acb->acb_compressed = compressed_read;
|
|
if (pio != NULL)
|
|
acb->acb_zio_dummy = zio_null(pio,
|
|
spa, NULL, NULL, NULL, zio_flags);
|
|
|
|
ASSERT3P(acb->acb_done, !=, NULL);
|
|
acb->acb_next = hdr->b_l1hdr.b_acb;
|
|
hdr->b_l1hdr.b_acb = acb;
|
|
mutex_exit(hash_lock);
|
|
goto out;
|
|
}
|
|
mutex_exit(hash_lock);
|
|
goto out;
|
|
}
|
|
|
|
ASSERT(hdr->b_l1hdr.b_state == arc_mru ||
|
|
hdr->b_l1hdr.b_state == arc_mfu);
|
|
|
|
if (done) {
|
|
if (hdr->b_flags & ARC_FLAG_PREDICTIVE_PREFETCH) {
|
|
/*
|
|
* This is a demand read which does not have to
|
|
* wait for i/o because we did a predictive
|
|
* prefetch i/o for it, which has completed.
|
|
*/
|
|
DTRACE_PROBE1(
|
|
arc__demand__hit__predictive__prefetch,
|
|
arc_buf_hdr_t *, hdr);
|
|
ARCSTAT_BUMP(
|
|
arcstat_demand_hit_predictive_prefetch);
|
|
arc_hdr_clear_flags(hdr,
|
|
ARC_FLAG_PREDICTIVE_PREFETCH);
|
|
}
|
|
ASSERT(!BP_IS_EMBEDDED(bp) || !BP_IS_HOLE(bp));
|
|
|
|
/* Get a buf with the desired data in it. */
|
|
VERIFY0(arc_buf_alloc_impl(hdr, private,
|
|
compressed_read, B_TRUE, &buf));
|
|
} else if (*arc_flags & ARC_FLAG_PREFETCH &&
|
|
refcount_count(&hdr->b_l1hdr.b_refcnt) == 0) {
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_PREFETCH);
|
|
}
|
|
DTRACE_PROBE1(arc__hit, arc_buf_hdr_t *, hdr);
|
|
arc_access(hdr, hash_lock);
|
|
if (*arc_flags & ARC_FLAG_L2CACHE)
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_L2CACHE);
|
|
mutex_exit(hash_lock);
|
|
ARCSTAT_BUMP(arcstat_hits);
|
|
ARCSTAT_CONDSTAT(!HDR_PREFETCH(hdr),
|
|
demand, prefetch, !HDR_ISTYPE_METADATA(hdr),
|
|
data, metadata, hits);
|
|
|
|
if (done)
|
|
done(NULL, buf, private);
|
|
} else {
|
|
uint64_t lsize = BP_GET_LSIZE(bp);
|
|
uint64_t psize = BP_GET_PSIZE(bp);
|
|
arc_callback_t *acb;
|
|
vdev_t *vd = NULL;
|
|
uint64_t addr = 0;
|
|
boolean_t devw = B_FALSE;
|
|
uint64_t size;
|
|
|
|
/*
|
|
* Gracefully handle a damaged logical block size as a
|
|
* checksum error.
|
|
*/
|
|
if (lsize > spa_maxblocksize(spa)) {
|
|
rc = SET_ERROR(ECKSUM);
|
|
goto out;
|
|
}
|
|
|
|
if (hdr == NULL) {
|
|
/* this block is not in the cache */
|
|
arc_buf_hdr_t *exists = NULL;
|
|
arc_buf_contents_t type = BP_GET_BUFC_TYPE(bp);
|
|
hdr = arc_hdr_alloc(spa_load_guid(spa), psize, lsize,
|
|
BP_GET_COMPRESS(bp), type);
|
|
|
|
if (!BP_IS_EMBEDDED(bp)) {
|
|
hdr->b_dva = *BP_IDENTITY(bp);
|
|
hdr->b_birth = BP_PHYSICAL_BIRTH(bp);
|
|
exists = buf_hash_insert(hdr, &hash_lock);
|
|
}
|
|
if (exists != NULL) {
|
|
/* somebody beat us to the hash insert */
|
|
mutex_exit(hash_lock);
|
|
buf_discard_identity(hdr);
|
|
arc_hdr_destroy(hdr);
|
|
goto top; /* restart the IO request */
|
|
}
|
|
} else {
|
|
/*
|
|
* This block is in the ghost cache. If it was L2-only
|
|
* (and thus didn't have an L1 hdr), we realloc the
|
|
* header to add an L1 hdr.
|
|
*/
|
|
if (!HDR_HAS_L1HDR(hdr)) {
|
|
hdr = arc_hdr_realloc(hdr, hdr_l2only_cache,
|
|
hdr_full_cache);
|
|
}
|
|
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
ASSERT(GHOST_STATE(hdr->b_l1hdr.b_state));
|
|
ASSERT(!HDR_IO_IN_PROGRESS(hdr));
|
|
ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
|
|
ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);
|
|
|
|
/*
|
|
* This is a delicate dance that we play here.
|
|
* This hdr is in the ghost list so we access it
|
|
* to move it out of the ghost list before we
|
|
* initiate the read. If it's a prefetch then
|
|
* it won't have a callback so we'll remove the
|
|
* reference that arc_buf_alloc_impl() created. We
|
|
* do this after we've called arc_access() to
|
|
* avoid hitting an assert in remove_reference().
|
|
*/
|
|
arc_access(hdr, hash_lock);
|
|
arc_hdr_alloc_pabd(hdr);
|
|
}
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
size = arc_hdr_size(hdr);
|
|
|
|
/*
|
|
* If compression is enabled on the hdr, then will do
|
|
* RAW I/O and will store the compressed data in the hdr's
|
|
* data block. Otherwise, the hdr's data block will contain
|
|
* the uncompressed data.
|
|
*/
|
|
if (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF) {
|
|
zio_flags |= ZIO_FLAG_RAW;
|
|
}
|
|
|
|
if (*arc_flags & ARC_FLAG_PREFETCH)
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_PREFETCH);
|
|
if (*arc_flags & ARC_FLAG_L2CACHE)
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_L2CACHE);
|
|
if (BP_GET_LEVEL(bp) > 0)
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_INDIRECT);
|
|
if (*arc_flags & ARC_FLAG_PREDICTIVE_PREFETCH)
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_PREDICTIVE_PREFETCH);
|
|
ASSERT(!GHOST_STATE(hdr->b_l1hdr.b_state));
|
|
|
|
acb = kmem_zalloc(sizeof (arc_callback_t), KM_SLEEP);
|
|
acb->acb_done = done;
|
|
acb->acb_private = private;
|
|
acb->acb_compressed = compressed_read;
|
|
|
|
ASSERT3P(hdr->b_l1hdr.b_acb, ==, NULL);
|
|
hdr->b_l1hdr.b_acb = acb;
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
|
|
|
|
if (HDR_HAS_L2HDR(hdr) &&
|
|
(vd = hdr->b_l2hdr.b_dev->l2ad_vdev) != NULL) {
|
|
devw = hdr->b_l2hdr.b_dev->l2ad_writing;
|
|
addr = hdr->b_l2hdr.b_daddr;
|
|
/*
|
|
* Lock out device removal.
|
|
*/
|
|
if (vdev_is_dead(vd) ||
|
|
!spa_config_tryenter(spa, SCL_L2ARC, vd, RW_READER))
|
|
vd = NULL;
|
|
}
|
|
|
|
if (priority == ZIO_PRIORITY_ASYNC_READ)
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_PRIO_ASYNC_READ);
|
|
else
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_PRIO_ASYNC_READ);
|
|
|
|
if (hash_lock != NULL)
|
|
mutex_exit(hash_lock);
|
|
|
|
/*
|
|
* At this point, we have a level 1 cache miss. Try again in
|
|
* L2ARC if possible.
|
|
*/
|
|
ASSERT3U(HDR_GET_LSIZE(hdr), ==, lsize);
|
|
|
|
DTRACE_PROBE4(arc__miss, arc_buf_hdr_t *, hdr, blkptr_t *, bp,
|
|
uint64_t, lsize, zbookmark_phys_t *, zb);
|
|
ARCSTAT_BUMP(arcstat_misses);
|
|
ARCSTAT_CONDSTAT(!HDR_PREFETCH(hdr),
|
|
demand, prefetch, !HDR_ISTYPE_METADATA(hdr),
|
|
data, metadata, misses);
|
|
|
|
if (vd != NULL && l2arc_ndev != 0 && !(l2arc_norw && devw)) {
|
|
/*
|
|
* Read from the L2ARC if the following are true:
|
|
* 1. The L2ARC vdev was previously cached.
|
|
* 2. This buffer still has L2ARC metadata.
|
|
* 3. This buffer isn't currently writing to the L2ARC.
|
|
* 4. The L2ARC entry wasn't evicted, which may
|
|
* also have invalidated the vdev.
|
|
* 5. This isn't prefetch and l2arc_noprefetch is set.
|
|
*/
|
|
if (HDR_HAS_L2HDR(hdr) &&
|
|
!HDR_L2_WRITING(hdr) && !HDR_L2_EVICTED(hdr) &&
|
|
!(l2arc_noprefetch && HDR_PREFETCH(hdr))) {
|
|
l2arc_read_callback_t *cb;
|
|
abd_t *abd;
|
|
uint64_t asize;
|
|
|
|
DTRACE_PROBE1(l2arc__hit, arc_buf_hdr_t *, hdr);
|
|
ARCSTAT_BUMP(arcstat_l2_hits);
|
|
atomic_inc_32(&hdr->b_l2hdr.b_hits);
|
|
|
|
cb = kmem_zalloc(sizeof (l2arc_read_callback_t),
|
|
KM_SLEEP);
|
|
cb->l2rcb_hdr = hdr;
|
|
cb->l2rcb_bp = *bp;
|
|
cb->l2rcb_zb = *zb;
|
|
cb->l2rcb_flags = zio_flags;
|
|
|
|
asize = vdev_psize_to_asize(vd, size);
|
|
if (asize != size) {
|
|
abd = abd_alloc_for_io(asize,
|
|
HDR_ISTYPE_METADATA(hdr));
|
|
cb->l2rcb_abd = abd;
|
|
} else {
|
|
abd = hdr->b_l1hdr.b_pabd;
|
|
}
|
|
|
|
ASSERT(addr >= VDEV_LABEL_START_SIZE &&
|
|
addr + asize <= vd->vdev_psize -
|
|
VDEV_LABEL_END_SIZE);
|
|
|
|
/*
|
|
* l2arc read. The SCL_L2ARC lock will be
|
|
* released by l2arc_read_done().
|
|
* Issue a null zio if the underlying buffer
|
|
* was squashed to zero size by compression.
|
|
*/
|
|
ASSERT3U(HDR_GET_COMPRESS(hdr), !=,
|
|
ZIO_COMPRESS_EMPTY);
|
|
rzio = zio_read_phys(pio, vd, addr,
|
|
asize, abd,
|
|
ZIO_CHECKSUM_OFF,
|
|
l2arc_read_done, cb, priority,
|
|
zio_flags | ZIO_FLAG_DONT_CACHE |
|
|
ZIO_FLAG_CANFAIL |
|
|
ZIO_FLAG_DONT_PROPAGATE |
|
|
ZIO_FLAG_DONT_RETRY, B_FALSE);
|
|
|
|
DTRACE_PROBE2(l2arc__read, vdev_t *, vd,
|
|
zio_t *, rzio);
|
|
ARCSTAT_INCR(arcstat_l2_read_bytes, size);
|
|
|
|
if (*arc_flags & ARC_FLAG_NOWAIT) {
|
|
zio_nowait(rzio);
|
|
goto out;
|
|
}
|
|
|
|
ASSERT(*arc_flags & ARC_FLAG_WAIT);
|
|
if (zio_wait(rzio) == 0)
|
|
goto out;
|
|
|
|
/* l2arc read error; goto zio_read() */
|
|
} else {
|
|
DTRACE_PROBE1(l2arc__miss,
|
|
arc_buf_hdr_t *, hdr);
|
|
ARCSTAT_BUMP(arcstat_l2_misses);
|
|
if (HDR_L2_WRITING(hdr))
|
|
ARCSTAT_BUMP(arcstat_l2_rw_clash);
|
|
spa_config_exit(spa, SCL_L2ARC, vd);
|
|
}
|
|
} else {
|
|
if (vd != NULL)
|
|
spa_config_exit(spa, SCL_L2ARC, vd);
|
|
if (l2arc_ndev != 0) {
|
|
DTRACE_PROBE1(l2arc__miss,
|
|
arc_buf_hdr_t *, hdr);
|
|
ARCSTAT_BUMP(arcstat_l2_misses);
|
|
}
|
|
}
|
|
|
|
rzio = zio_read(pio, spa, bp, hdr->b_l1hdr.b_pabd, size,
|
|
arc_read_done, hdr, priority, zio_flags, zb);
|
|
|
|
if (*arc_flags & ARC_FLAG_WAIT) {
|
|
rc = zio_wait(rzio);
|
|
goto out;
|
|
}
|
|
|
|
ASSERT(*arc_flags & ARC_FLAG_NOWAIT);
|
|
zio_nowait(rzio);
|
|
}
|
|
|
|
out:
|
|
spa_read_history_add(spa, zb, *arc_flags);
|
|
return (rc);
|
|
}
|
|
|
|
arc_prune_t *
|
|
arc_add_prune_callback(arc_prune_func_t *func, void *private)
|
|
{
|
|
arc_prune_t *p;
|
|
|
|
p = kmem_alloc(sizeof (*p), KM_SLEEP);
|
|
p->p_pfunc = func;
|
|
p->p_private = private;
|
|
list_link_init(&p->p_node);
|
|
refcount_create(&p->p_refcnt);
|
|
|
|
mutex_enter(&arc_prune_mtx);
|
|
refcount_add(&p->p_refcnt, &arc_prune_list);
|
|
list_insert_head(&arc_prune_list, p);
|
|
mutex_exit(&arc_prune_mtx);
|
|
|
|
return (p);
|
|
}
|
|
|
|
void
|
|
arc_remove_prune_callback(arc_prune_t *p)
|
|
{
|
|
boolean_t wait = B_FALSE;
|
|
mutex_enter(&arc_prune_mtx);
|
|
list_remove(&arc_prune_list, p);
|
|
if (refcount_remove(&p->p_refcnt, &arc_prune_list) > 0)
|
|
wait = B_TRUE;
|
|
mutex_exit(&arc_prune_mtx);
|
|
|
|
/* wait for arc_prune_task to finish */
|
|
if (wait)
|
|
taskq_wait_outstanding(arc_prune_taskq, 0);
|
|
ASSERT0(refcount_count(&p->p_refcnt));
|
|
refcount_destroy(&p->p_refcnt);
|
|
kmem_free(p, sizeof (*p));
|
|
}
|
|
|
|
/*
|
|
* Notify the arc that a block was freed, and thus will never be used again.
|
|
*/
|
|
void
|
|
arc_freed(spa_t *spa, const blkptr_t *bp)
|
|
{
|
|
arc_buf_hdr_t *hdr;
|
|
kmutex_t *hash_lock;
|
|
uint64_t guid = spa_load_guid(spa);
|
|
|
|
ASSERT(!BP_IS_EMBEDDED(bp));
|
|
|
|
hdr = buf_hash_find(guid, bp, &hash_lock);
|
|
if (hdr == NULL)
|
|
return;
|
|
|
|
/*
|
|
* We might be trying to free a block that is still doing I/O
|
|
* (i.e. prefetch) or has a reference (i.e. a dedup-ed,
|
|
* dmu_sync-ed block). If this block is being prefetched, then it
|
|
* would still have the ARC_FLAG_IO_IN_PROGRESS flag set on the hdr
|
|
* until the I/O completes. A block may also have a reference if it is
|
|
* part of a dedup-ed, dmu_synced write. The dmu_sync() function would
|
|
* have written the new block to its final resting place on disk but
|
|
* without the dedup flag set. This would have left the hdr in the MRU
|
|
* state and discoverable. When the txg finally syncs it detects that
|
|
* the block was overridden in open context and issues an override I/O.
|
|
* Since this is a dedup block, the override I/O will determine if the
|
|
* block is already in the DDT. If so, then it will replace the io_bp
|
|
* with the bp from the DDT and allow the I/O to finish. When the I/O
|
|
* reaches the done callback, dbuf_write_override_done, it will
|
|
* check to see if the io_bp and io_bp_override are identical.
|
|
* If they are not, then it indicates that the bp was replaced with
|
|
* the bp in the DDT and the override bp is freed. This allows
|
|
* us to arrive here with a reference on a block that is being
|
|
* freed. So if we have an I/O in progress, or a reference to
|
|
* this hdr, then we don't destroy the hdr.
|
|
*/
|
|
if (!HDR_HAS_L1HDR(hdr) || (!HDR_IO_IN_PROGRESS(hdr) &&
|
|
refcount_is_zero(&hdr->b_l1hdr.b_refcnt))) {
|
|
arc_change_state(arc_anon, hdr, hash_lock);
|
|
arc_hdr_destroy(hdr);
|
|
mutex_exit(hash_lock);
|
|
} else {
|
|
mutex_exit(hash_lock);
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Release this buffer from the cache, making it an anonymous buffer. This
|
|
* must be done after a read and prior to modifying the buffer contents.
|
|
* If the buffer has more than one reference, we must make
|
|
* a new hdr for the buffer.
|
|
*/
|
|
void
|
|
arc_release(arc_buf_t *buf, void *tag)
|
|
{
|
|
kmutex_t *hash_lock;
|
|
arc_state_t *state;
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
|
|
/*
|
|
* It would be nice to assert that if its DMU metadata (level >
|
|
* 0 || it's the dnode file), then it must be syncing context.
|
|
* But we don't know that information at this level.
|
|
*/
|
|
|
|
mutex_enter(&buf->b_evict_lock);
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
/*
|
|
* We don't grab the hash lock prior to this check, because if
|
|
* the buffer's header is in the arc_anon state, it won't be
|
|
* linked into the hash table.
|
|
*/
|
|
if (hdr->b_l1hdr.b_state == arc_anon) {
|
|
mutex_exit(&buf->b_evict_lock);
|
|
ASSERT(!HDR_IO_IN_PROGRESS(hdr));
|
|
ASSERT(!HDR_IN_HASH_TABLE(hdr));
|
|
ASSERT(!HDR_HAS_L2HDR(hdr));
|
|
ASSERT(HDR_EMPTY(hdr));
|
|
|
|
ASSERT3U(hdr->b_l1hdr.b_bufcnt, ==, 1);
|
|
ASSERT3S(refcount_count(&hdr->b_l1hdr.b_refcnt), ==, 1);
|
|
ASSERT(!list_link_active(&hdr->b_l1hdr.b_arc_node));
|
|
|
|
hdr->b_l1hdr.b_arc_access = 0;
|
|
|
|
/*
|
|
* If the buf is being overridden then it may already
|
|
* have a hdr that is not empty.
|
|
*/
|
|
buf_discard_identity(hdr);
|
|
arc_buf_thaw(buf);
|
|
|
|
return;
|
|
}
|
|
|
|
hash_lock = HDR_LOCK(hdr);
|
|
mutex_enter(hash_lock);
|
|
|
|
/*
|
|
* This assignment is only valid as long as the hash_lock is
|
|
* held, we must be careful not to reference state or the
|
|
* b_state field after dropping the lock.
|
|
*/
|
|
state = hdr->b_l1hdr.b_state;
|
|
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr));
|
|
ASSERT3P(state, !=, arc_anon);
|
|
|
|
/* this buffer is not on any list */
|
|
ASSERT3S(refcount_count(&hdr->b_l1hdr.b_refcnt), >, 0);
|
|
|
|
if (HDR_HAS_L2HDR(hdr)) {
|
|
mutex_enter(&hdr->b_l2hdr.b_dev->l2ad_mtx);
|
|
|
|
/*
|
|
* We have to recheck this conditional again now that
|
|
* we're holding the l2ad_mtx to prevent a race with
|
|
* another thread which might be concurrently calling
|
|
* l2arc_evict(). In that case, l2arc_evict() might have
|
|
* destroyed the header's L2 portion as we were waiting
|
|
* to acquire the l2ad_mtx.
|
|
*/
|
|
if (HDR_HAS_L2HDR(hdr))
|
|
arc_hdr_l2hdr_destroy(hdr);
|
|
|
|
mutex_exit(&hdr->b_l2hdr.b_dev->l2ad_mtx);
|
|
}
|
|
|
|
/*
|
|
* Do we have more than one buf?
|
|
*/
|
|
if (hdr->b_l1hdr.b_bufcnt > 1) {
|
|
arc_buf_hdr_t *nhdr;
|
|
uint64_t spa = hdr->b_spa;
|
|
uint64_t psize = HDR_GET_PSIZE(hdr);
|
|
uint64_t lsize = HDR_GET_LSIZE(hdr);
|
|
enum zio_compress compress = HDR_GET_COMPRESS(hdr);
|
|
arc_buf_contents_t type = arc_buf_type(hdr);
|
|
VERIFY3U(hdr->b_type, ==, type);
|
|
|
|
ASSERT(hdr->b_l1hdr.b_buf != buf || buf->b_next != NULL);
|
|
(void) remove_reference(hdr, hash_lock, tag);
|
|
|
|
if (arc_buf_is_shared(buf) && !ARC_BUF_COMPRESSED(buf)) {
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, !=, buf);
|
|
ASSERT(ARC_BUF_LAST(buf));
|
|
}
|
|
|
|
/*
|
|
* Pull the data off of this hdr and attach it to
|
|
* a new anonymous hdr. Also find the last buffer
|
|
* in the hdr's buffer list.
|
|
*/
|
|
arc_buf_t *lastbuf = arc_buf_remove(hdr, buf);
|
|
ASSERT3P(lastbuf, !=, NULL);
|
|
|
|
/*
|
|
* If the current arc_buf_t and the hdr are sharing their data
|
|
* buffer, then we must stop sharing that block.
|
|
*/
|
|
if (arc_buf_is_shared(buf)) {
|
|
ASSERT3P(hdr->b_l1hdr.b_buf, !=, buf);
|
|
VERIFY(!arc_buf_is_shared(lastbuf));
|
|
|
|
/*
|
|
* First, sever the block sharing relationship between
|
|
* buf and the arc_buf_hdr_t.
|
|
*/
|
|
arc_unshare_buf(hdr, buf);
|
|
|
|
/*
|
|
* Now we need to recreate the hdr's b_pabd. Since we
|
|
* have lastbuf handy, we try to share with it, but if
|
|
* we can't then we allocate a new b_pabd and copy the
|
|
* data from buf into it.
|
|
*/
|
|
if (arc_can_share(hdr, lastbuf)) {
|
|
arc_share_buf(hdr, lastbuf);
|
|
} else {
|
|
arc_hdr_alloc_pabd(hdr);
|
|
abd_copy_from_buf(hdr->b_l1hdr.b_pabd,
|
|
buf->b_data, psize);
|
|
}
|
|
VERIFY3P(lastbuf->b_data, !=, NULL);
|
|
} else if (HDR_SHARED_DATA(hdr)) {
|
|
/*
|
|
* Uncompressed shared buffers are always at the end
|
|
* of the list. Compressed buffers don't have the
|
|
* same requirements. This makes it hard to
|
|
* simply assert that the lastbuf is shared so
|
|
* we rely on the hdr's compression flags to determine
|
|
* if we have a compressed, shared buffer.
|
|
*/
|
|
ASSERT(arc_buf_is_shared(lastbuf) ||
|
|
HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF);
|
|
ASSERT(!ARC_BUF_SHARED(buf));
|
|
}
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
ASSERT3P(state, !=, arc_l2c_only);
|
|
|
|
(void) refcount_remove_many(&state->arcs_size,
|
|
arc_buf_size(buf), buf);
|
|
|
|
if (refcount_is_zero(&hdr->b_l1hdr.b_refcnt)) {
|
|
ASSERT3P(state, !=, arc_l2c_only);
|
|
(void) refcount_remove_many(&state->arcs_esize[type],
|
|
arc_buf_size(buf), buf);
|
|
}
|
|
|
|
hdr->b_l1hdr.b_bufcnt -= 1;
|
|
arc_cksum_verify(buf);
|
|
arc_buf_unwatch(buf);
|
|
|
|
/* if this is the last uncompressed buf free the checksum */
|
|
if (!arc_hdr_has_uncompressed_buf(hdr))
|
|
arc_cksum_free(hdr);
|
|
|
|
mutex_exit(hash_lock);
|
|
|
|
/*
|
|
* Allocate a new hdr. The new hdr will contain a b_pabd
|
|
* buffer which will be freed in arc_write().
|
|
*/
|
|
nhdr = arc_hdr_alloc(spa, psize, lsize, compress, type);
|
|
ASSERT3P(nhdr->b_l1hdr.b_buf, ==, NULL);
|
|
ASSERT0(nhdr->b_l1hdr.b_bufcnt);
|
|
ASSERT0(refcount_count(&nhdr->b_l1hdr.b_refcnt));
|
|
VERIFY3U(nhdr->b_type, ==, type);
|
|
ASSERT(!HDR_SHARED_DATA(nhdr));
|
|
|
|
nhdr->b_l1hdr.b_buf = buf;
|
|
nhdr->b_l1hdr.b_bufcnt = 1;
|
|
nhdr->b_l1hdr.b_mru_hits = 0;
|
|
nhdr->b_l1hdr.b_mru_ghost_hits = 0;
|
|
nhdr->b_l1hdr.b_mfu_hits = 0;
|
|
nhdr->b_l1hdr.b_mfu_ghost_hits = 0;
|
|
nhdr->b_l1hdr.b_l2_hits = 0;
|
|
(void) refcount_add(&nhdr->b_l1hdr.b_refcnt, tag);
|
|
buf->b_hdr = nhdr;
|
|
|
|
mutex_exit(&buf->b_evict_lock);
|
|
(void) refcount_add_many(&arc_anon->arcs_size,
|
|
HDR_GET_LSIZE(nhdr), buf);
|
|
} else {
|
|
mutex_exit(&buf->b_evict_lock);
|
|
ASSERT(refcount_count(&hdr->b_l1hdr.b_refcnt) == 1);
|
|
/* protected by hash lock, or hdr is on arc_anon */
|
|
ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
|
|
ASSERT(!HDR_IO_IN_PROGRESS(hdr));
|
|
hdr->b_l1hdr.b_mru_hits = 0;
|
|
hdr->b_l1hdr.b_mru_ghost_hits = 0;
|
|
hdr->b_l1hdr.b_mfu_hits = 0;
|
|
hdr->b_l1hdr.b_mfu_ghost_hits = 0;
|
|
hdr->b_l1hdr.b_l2_hits = 0;
|
|
arc_change_state(arc_anon, hdr, hash_lock);
|
|
hdr->b_l1hdr.b_arc_access = 0;
|
|
mutex_exit(hash_lock);
|
|
|
|
buf_discard_identity(hdr);
|
|
arc_buf_thaw(buf);
|
|
}
|
|
}
|
|
|
|
int
|
|
arc_released(arc_buf_t *buf)
|
|
{
|
|
int released;
|
|
|
|
mutex_enter(&buf->b_evict_lock);
|
|
released = (buf->b_data != NULL &&
|
|
buf->b_hdr->b_l1hdr.b_state == arc_anon);
|
|
mutex_exit(&buf->b_evict_lock);
|
|
return (released);
|
|
}
|
|
|
|
#ifdef ZFS_DEBUG
|
|
int
|
|
arc_referenced(arc_buf_t *buf)
|
|
{
|
|
int referenced;
|
|
|
|
mutex_enter(&buf->b_evict_lock);
|
|
referenced = (refcount_count(&buf->b_hdr->b_l1hdr.b_refcnt));
|
|
mutex_exit(&buf->b_evict_lock);
|
|
return (referenced);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
arc_write_ready(zio_t *zio)
|
|
{
|
|
arc_write_callback_t *callback = zio->io_private;
|
|
arc_buf_t *buf = callback->awcb_buf;
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
uint64_t psize = BP_IS_HOLE(zio->io_bp) ? 0 : BP_GET_PSIZE(zio->io_bp);
|
|
enum zio_compress compress;
|
|
fstrans_cookie_t cookie = spl_fstrans_mark();
|
|
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
ASSERT(!refcount_is_zero(&buf->b_hdr->b_l1hdr.b_refcnt));
|
|
ASSERT(hdr->b_l1hdr.b_bufcnt > 0);
|
|
|
|
/*
|
|
* If we're reexecuting this zio because the pool suspended, then
|
|
* cleanup any state that was previously set the first time the
|
|
* callback was invoked.
|
|
*/
|
|
if (zio->io_flags & ZIO_FLAG_REEXECUTED) {
|
|
arc_cksum_free(hdr);
|
|
arc_buf_unwatch(buf);
|
|
if (hdr->b_l1hdr.b_pabd != NULL) {
|
|
if (arc_buf_is_shared(buf)) {
|
|
arc_unshare_buf(hdr, buf);
|
|
} else {
|
|
arc_hdr_free_pabd(hdr);
|
|
}
|
|
}
|
|
}
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
ASSERT(!HDR_SHARED_DATA(hdr));
|
|
ASSERT(!arc_buf_is_shared(buf));
|
|
|
|
callback->awcb_ready(zio, buf, callback->awcb_private);
|
|
|
|
if (HDR_IO_IN_PROGRESS(hdr))
|
|
ASSERT(zio->io_flags & ZIO_FLAG_REEXECUTED);
|
|
|
|
arc_cksum_compute(buf);
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
|
|
|
|
if (BP_IS_HOLE(zio->io_bp) || BP_IS_EMBEDDED(zio->io_bp)) {
|
|
compress = ZIO_COMPRESS_OFF;
|
|
} else {
|
|
ASSERT3U(HDR_GET_LSIZE(hdr), ==, BP_GET_LSIZE(zio->io_bp));
|
|
compress = BP_GET_COMPRESS(zio->io_bp);
|
|
}
|
|
HDR_SET_PSIZE(hdr, psize);
|
|
arc_hdr_set_compress(hdr, compress);
|
|
|
|
/*
|
|
* Fill the hdr with data. If the hdr is compressed, the data we want
|
|
* is available from the zio, otherwise we can take it from the buf.
|
|
*
|
|
* We might be able to share the buf's data with the hdr here. However,
|
|
* doing so would cause the ARC to be full of linear ABDs if we write a
|
|
* lot of shareable data. As a compromise, we check whether scattered
|
|
* ABDs are allowed, and assume that if they are then the user wants
|
|
* the ARC to be primarily filled with them regardless of the data being
|
|
* written. Therefore, if they're allowed then we allocate one and copy
|
|
* the data into it; otherwise, we share the data directly if we can.
|
|
*/
|
|
if (zfs_abd_scatter_enabled || !arc_can_share(hdr, buf)) {
|
|
arc_hdr_alloc_pabd(hdr);
|
|
|
|
/*
|
|
* Ideally, we would always copy the io_abd into b_pabd, but the
|
|
* user may have disabled compressed ARC, thus we must check the
|
|
* hdr's compression setting rather than the io_bp's.
|
|
*/
|
|
if (HDR_GET_COMPRESS(hdr) != ZIO_COMPRESS_OFF) {
|
|
ASSERT3U(BP_GET_COMPRESS(zio->io_bp), !=,
|
|
ZIO_COMPRESS_OFF);
|
|
ASSERT3U(psize, >, 0);
|
|
|
|
abd_copy(hdr->b_l1hdr.b_pabd, zio->io_abd, psize);
|
|
} else {
|
|
ASSERT3U(zio->io_orig_size, ==, arc_hdr_size(hdr));
|
|
|
|
abd_copy_from_buf(hdr->b_l1hdr.b_pabd, buf->b_data,
|
|
arc_buf_size(buf));
|
|
}
|
|
} else {
|
|
ASSERT3P(buf->b_data, ==, abd_to_buf(zio->io_orig_abd));
|
|
ASSERT3U(zio->io_orig_size, ==, arc_buf_size(buf));
|
|
ASSERT3U(hdr->b_l1hdr.b_bufcnt, ==, 1);
|
|
|
|
arc_share_buf(hdr, buf);
|
|
}
|
|
|
|
arc_hdr_verify(hdr, zio->io_bp);
|
|
spl_fstrans_unmark(cookie);
|
|
}
|
|
|
|
static void
|
|
arc_write_children_ready(zio_t *zio)
|
|
{
|
|
arc_write_callback_t *callback = zio->io_private;
|
|
arc_buf_t *buf = callback->awcb_buf;
|
|
|
|
callback->awcb_children_ready(zio, buf, callback->awcb_private);
|
|
}
|
|
|
|
/*
|
|
* The SPA calls this callback for each physical write that happens on behalf
|
|
* of a logical write. See the comment in dbuf_write_physdone() for details.
|
|
*/
|
|
static void
|
|
arc_write_physdone(zio_t *zio)
|
|
{
|
|
arc_write_callback_t *cb = zio->io_private;
|
|
if (cb->awcb_physdone != NULL)
|
|
cb->awcb_physdone(zio, cb->awcb_buf, cb->awcb_private);
|
|
}
|
|
|
|
static void
|
|
arc_write_done(zio_t *zio)
|
|
{
|
|
arc_write_callback_t *callback = zio->io_private;
|
|
arc_buf_t *buf = callback->awcb_buf;
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
|
|
ASSERT3P(hdr->b_l1hdr.b_acb, ==, NULL);
|
|
|
|
if (zio->io_error == 0) {
|
|
arc_hdr_verify(hdr, zio->io_bp);
|
|
|
|
if (BP_IS_HOLE(zio->io_bp) || BP_IS_EMBEDDED(zio->io_bp)) {
|
|
buf_discard_identity(hdr);
|
|
} else {
|
|
hdr->b_dva = *BP_IDENTITY(zio->io_bp);
|
|
hdr->b_birth = BP_PHYSICAL_BIRTH(zio->io_bp);
|
|
}
|
|
} else {
|
|
ASSERT(HDR_EMPTY(hdr));
|
|
}
|
|
|
|
/*
|
|
* If the block to be written was all-zero or compressed enough to be
|
|
* embedded in the BP, no write was performed so there will be no
|
|
* dva/birth/checksum. The buffer must therefore remain anonymous
|
|
* (and uncached).
|
|
*/
|
|
if (!HDR_EMPTY(hdr)) {
|
|
arc_buf_hdr_t *exists;
|
|
kmutex_t *hash_lock;
|
|
|
|
ASSERT3U(zio->io_error, ==, 0);
|
|
|
|
arc_cksum_verify(buf);
|
|
|
|
exists = buf_hash_insert(hdr, &hash_lock);
|
|
if (exists != NULL) {
|
|
/*
|
|
* This can only happen if we overwrite for
|
|
* sync-to-convergence, because we remove
|
|
* buffers from the hash table when we arc_free().
|
|
*/
|
|
if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
|
|
if (!BP_EQUAL(&zio->io_bp_orig, zio->io_bp))
|
|
panic("bad overwrite, hdr=%p exists=%p",
|
|
(void *)hdr, (void *)exists);
|
|
ASSERT(refcount_is_zero(
|
|
&exists->b_l1hdr.b_refcnt));
|
|
arc_change_state(arc_anon, exists, hash_lock);
|
|
mutex_exit(hash_lock);
|
|
arc_hdr_destroy(exists);
|
|
exists = buf_hash_insert(hdr, &hash_lock);
|
|
ASSERT3P(exists, ==, NULL);
|
|
} else if (zio->io_flags & ZIO_FLAG_NOPWRITE) {
|
|
/* nopwrite */
|
|
ASSERT(zio->io_prop.zp_nopwrite);
|
|
if (!BP_EQUAL(&zio->io_bp_orig, zio->io_bp))
|
|
panic("bad nopwrite, hdr=%p exists=%p",
|
|
(void *)hdr, (void *)exists);
|
|
} else {
|
|
/* Dedup */
|
|
ASSERT(hdr->b_l1hdr.b_bufcnt == 1);
|
|
ASSERT(hdr->b_l1hdr.b_state == arc_anon);
|
|
ASSERT(BP_GET_DEDUP(zio->io_bp));
|
|
ASSERT(BP_GET_LEVEL(zio->io_bp) == 0);
|
|
}
|
|
}
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
|
|
/* if it's not anon, we are doing a scrub */
|
|
if (exists == NULL && hdr->b_l1hdr.b_state == arc_anon)
|
|
arc_access(hdr, hash_lock);
|
|
mutex_exit(hash_lock);
|
|
} else {
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
|
|
}
|
|
|
|
ASSERT(!refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
|
|
callback->awcb_done(zio, buf, callback->awcb_private);
|
|
|
|
abd_put(zio->io_abd);
|
|
kmem_free(callback, sizeof (arc_write_callback_t));
|
|
}
|
|
|
|
zio_t *
|
|
arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
|
|
blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc,
|
|
const zio_prop_t *zp, arc_done_func_t *ready,
|
|
arc_done_func_t *children_ready, arc_done_func_t *physdone,
|
|
arc_done_func_t *done, void *private, zio_priority_t priority,
|
|
int zio_flags, const zbookmark_phys_t *zb)
|
|
{
|
|
arc_buf_hdr_t *hdr = buf->b_hdr;
|
|
arc_write_callback_t *callback;
|
|
zio_t *zio;
|
|
zio_prop_t localprop = *zp;
|
|
|
|
ASSERT3P(ready, !=, NULL);
|
|
ASSERT3P(done, !=, NULL);
|
|
ASSERT(!HDR_IO_ERROR(hdr));
|
|
ASSERT(!HDR_IO_IN_PROGRESS(hdr));
|
|
ASSERT3P(hdr->b_l1hdr.b_acb, ==, NULL);
|
|
ASSERT3U(hdr->b_l1hdr.b_bufcnt, >, 0);
|
|
if (l2arc)
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_L2CACHE);
|
|
if (ARC_BUF_COMPRESSED(buf)) {
|
|
/*
|
|
* We're writing a pre-compressed buffer. Make the
|
|
* compression algorithm requested by the zio_prop_t match
|
|
* the pre-compressed buffer's compression algorithm.
|
|
*/
|
|
localprop.zp_compress = HDR_GET_COMPRESS(hdr);
|
|
|
|
ASSERT3U(HDR_GET_LSIZE(hdr), !=, arc_buf_size(buf));
|
|
zio_flags |= ZIO_FLAG_RAW;
|
|
}
|
|
callback = kmem_zalloc(sizeof (arc_write_callback_t), KM_SLEEP);
|
|
callback->awcb_ready = ready;
|
|
callback->awcb_children_ready = children_ready;
|
|
callback->awcb_physdone = physdone;
|
|
callback->awcb_done = done;
|
|
callback->awcb_private = private;
|
|
callback->awcb_buf = buf;
|
|
|
|
/*
|
|
* The hdr's b_pabd is now stale, free it now. A new data block
|
|
* will be allocated when the zio pipeline calls arc_write_ready().
|
|
*/
|
|
if (hdr->b_l1hdr.b_pabd != NULL) {
|
|
/*
|
|
* If the buf is currently sharing the data block with
|
|
* the hdr then we need to break that relationship here.
|
|
* The hdr will remain with a NULL data pointer and the
|
|
* buf will take sole ownership of the block.
|
|
*/
|
|
if (arc_buf_is_shared(buf)) {
|
|
arc_unshare_buf(hdr, buf);
|
|
} else {
|
|
arc_hdr_free_pabd(hdr);
|
|
}
|
|
VERIFY3P(buf->b_data, !=, NULL);
|
|
arc_hdr_set_compress(hdr, ZIO_COMPRESS_OFF);
|
|
}
|
|
ASSERT(!arc_buf_is_shared(buf));
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
|
|
|
|
zio = zio_write(pio, spa, txg, bp,
|
|
abd_get_from_buf(buf->b_data, HDR_GET_LSIZE(hdr)),
|
|
HDR_GET_LSIZE(hdr), arc_buf_size(buf), &localprop, arc_write_ready,
|
|
(children_ready != NULL) ? arc_write_children_ready : NULL,
|
|
arc_write_physdone, arc_write_done, callback,
|
|
priority, zio_flags, zb);
|
|
|
|
return (zio);
|
|
}
|
|
|
|
static int
|
|
arc_memory_throttle(uint64_t reserve, uint64_t txg)
|
|
{
|
|
#ifdef _KERNEL
|
|
uint64_t available_memory = ptob(freemem);
|
|
static uint64_t page_load = 0;
|
|
static uint64_t last_txg = 0;
|
|
#ifdef __linux__
|
|
pgcnt_t minfree = btop(arc_sys_free / 4);
|
|
#endif
|
|
|
|
#if defined(__i386)
|
|
available_memory =
|
|
MIN(available_memory, vmem_size(heap_arena, VMEM_FREE));
|
|
#endif
|
|
|
|
if (available_memory > arc_all_memory() * arc_lotsfree_percent / 100)
|
|
return (0);
|
|
|
|
if (txg > last_txg) {
|
|
last_txg = txg;
|
|
page_load = 0;
|
|
}
|
|
/*
|
|
* If we are in pageout, we know that memory is already tight,
|
|
* the arc is already going to be evicting, so we just want to
|
|
* continue to let page writes occur as quickly as possible.
|
|
*/
|
|
if (current_is_kswapd()) {
|
|
if (page_load > MAX(ptob(minfree), available_memory) / 4) {
|
|
DMU_TX_STAT_BUMP(dmu_tx_memory_reclaim);
|
|
return (SET_ERROR(ERESTART));
|
|
}
|
|
/* Note: reserve is inflated, so we deflate */
|
|
page_load += reserve / 8;
|
|
return (0);
|
|
} else if (page_load > 0 && arc_reclaim_needed()) {
|
|
/* memory is low, delay before restarting */
|
|
ARCSTAT_INCR(arcstat_memory_throttle_count, 1);
|
|
DMU_TX_STAT_BUMP(dmu_tx_memory_reclaim);
|
|
return (SET_ERROR(EAGAIN));
|
|
}
|
|
page_load = 0;
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
arc_tempreserve_clear(uint64_t reserve)
|
|
{
|
|
atomic_add_64(&arc_tempreserve, -reserve);
|
|
ASSERT((int64_t)arc_tempreserve >= 0);
|
|
}
|
|
|
|
int
|
|
arc_tempreserve_space(uint64_t reserve, uint64_t txg)
|
|
{
|
|
int error;
|
|
uint64_t anon_size;
|
|
|
|
if (!arc_no_grow &&
|
|
reserve > arc_c/4 &&
|
|
reserve * 4 > (2ULL << SPA_MAXBLOCKSHIFT))
|
|
arc_c = MIN(arc_c_max, reserve * 4);
|
|
|
|
/*
|
|
* Throttle when the calculated memory footprint for the TXG
|
|
* exceeds the target ARC size.
|
|
*/
|
|
if (reserve > arc_c) {
|
|
DMU_TX_STAT_BUMP(dmu_tx_memory_reserve);
|
|
return (SET_ERROR(ERESTART));
|
|
}
|
|
|
|
/*
|
|
* Don't count loaned bufs as in flight dirty data to prevent long
|
|
* network delays from blocking transactions that are ready to be
|
|
* assigned to a txg.
|
|
*/
|
|
|
|
/* assert that it has not wrapped around */
|
|
ASSERT3S(atomic_add_64_nv(&arc_loaned_bytes, 0), >=, 0);
|
|
|
|
anon_size = MAX((int64_t)(refcount_count(&arc_anon->arcs_size) -
|
|
arc_loaned_bytes), 0);
|
|
|
|
/*
|
|
* Writes will, almost always, require additional memory allocations
|
|
* in order to compress/encrypt/etc the data. We therefore need to
|
|
* make sure that there is sufficient available memory for this.
|
|
*/
|
|
error = arc_memory_throttle(reserve, txg);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* Throttle writes when the amount of dirty data in the cache
|
|
* gets too large. We try to keep the cache less than half full
|
|
* of dirty blocks so that our sync times don't grow too large.
|
|
* Note: if two requests come in concurrently, we might let them
|
|
* both succeed, when one of them should fail. Not a huge deal.
|
|
*/
|
|
|
|
if (reserve + arc_tempreserve + anon_size > arc_c / 2 &&
|
|
anon_size > arc_c / 4) {
|
|
uint64_t meta_esize =
|
|
refcount_count(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
|
|
uint64_t data_esize =
|
|
refcount_count(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
|
|
dprintf("failing, arc_tempreserve=%lluK anon_meta=%lluK "
|
|
"anon_data=%lluK tempreserve=%lluK arc_c=%lluK\n",
|
|
arc_tempreserve >> 10, meta_esize >> 10,
|
|
data_esize >> 10, reserve >> 10, arc_c >> 10);
|
|
DMU_TX_STAT_BUMP(dmu_tx_dirty_throttle);
|
|
return (SET_ERROR(ERESTART));
|
|
}
|
|
atomic_add_64(&arc_tempreserve, reserve);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
arc_kstat_update_state(arc_state_t *state, kstat_named_t *size,
|
|
kstat_named_t *evict_data, kstat_named_t *evict_metadata)
|
|
{
|
|
size->value.ui64 = refcount_count(&state->arcs_size);
|
|
evict_data->value.ui64 =
|
|
refcount_count(&state->arcs_esize[ARC_BUFC_DATA]);
|
|
evict_metadata->value.ui64 =
|
|
refcount_count(&state->arcs_esize[ARC_BUFC_METADATA]);
|
|
}
|
|
|
|
static int
|
|
arc_kstat_update(kstat_t *ksp, int rw)
|
|
{
|
|
arc_stats_t *as = ksp->ks_data;
|
|
|
|
if (rw == KSTAT_WRITE) {
|
|
return (EACCES);
|
|
} else {
|
|
arc_kstat_update_state(arc_anon,
|
|
&as->arcstat_anon_size,
|
|
&as->arcstat_anon_evictable_data,
|
|
&as->arcstat_anon_evictable_metadata);
|
|
arc_kstat_update_state(arc_mru,
|
|
&as->arcstat_mru_size,
|
|
&as->arcstat_mru_evictable_data,
|
|
&as->arcstat_mru_evictable_metadata);
|
|
arc_kstat_update_state(arc_mru_ghost,
|
|
&as->arcstat_mru_ghost_size,
|
|
&as->arcstat_mru_ghost_evictable_data,
|
|
&as->arcstat_mru_ghost_evictable_metadata);
|
|
arc_kstat_update_state(arc_mfu,
|
|
&as->arcstat_mfu_size,
|
|
&as->arcstat_mfu_evictable_data,
|
|
&as->arcstat_mfu_evictable_metadata);
|
|
arc_kstat_update_state(arc_mfu_ghost,
|
|
&as->arcstat_mfu_ghost_size,
|
|
&as->arcstat_mfu_ghost_evictable_data,
|
|
&as->arcstat_mfu_ghost_evictable_metadata);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This function *must* return indices evenly distributed between all
|
|
* sublists of the multilist. This is needed due to how the ARC eviction
|
|
* code is laid out; arc_evict_state() assumes ARC buffers are evenly
|
|
* distributed between all sublists and uses this assumption when
|
|
* deciding which sublist to evict from and how much to evict from it.
|
|
*/
|
|
unsigned int
|
|
arc_state_multilist_index_func(multilist_t *ml, void *obj)
|
|
{
|
|
arc_buf_hdr_t *hdr = obj;
|
|
|
|
/*
|
|
* We rely on b_dva to generate evenly distributed index
|
|
* numbers using buf_hash below. So, as an added precaution,
|
|
* let's make sure we never add empty buffers to the arc lists.
|
|
*/
|
|
ASSERT(!HDR_EMPTY(hdr));
|
|
|
|
/*
|
|
* The assumption here, is the hash value for a given
|
|
* arc_buf_hdr_t will remain constant throughout its lifetime
|
|
* (i.e. its b_spa, b_dva, and b_birth fields don't change).
|
|
* Thus, we don't need to store the header's sublist index
|
|
* on insertion, as this index can be recalculated on removal.
|
|
*
|
|
* Also, the low order bits of the hash value are thought to be
|
|
* distributed evenly. Otherwise, in the case that the multilist
|
|
* has a power of two number of sublists, each sublists' usage
|
|
* would not be evenly distributed.
|
|
*/
|
|
return (buf_hash(hdr->b_spa, &hdr->b_dva, hdr->b_birth) %
|
|
multilist_get_num_sublists(ml));
|
|
}
|
|
|
|
/*
|
|
* Called during module initialization and periodically thereafter to
|
|
* apply reasonable changes to the exposed performance tunings. Non-zero
|
|
* zfs_* values which differ from the currently set values will be applied.
|
|
*/
|
|
static void
|
|
arc_tuning_update(void)
|
|
{
|
|
uint64_t percent, allmem = arc_all_memory();
|
|
|
|
/* Valid range: 64M - <all physical memory> */
|
|
if ((zfs_arc_max) && (zfs_arc_max != arc_c_max) &&
|
|
(zfs_arc_max > 64 << 20) && (zfs_arc_max < allmem) &&
|
|
(zfs_arc_max > arc_c_min)) {
|
|
arc_c_max = zfs_arc_max;
|
|
arc_c = arc_c_max;
|
|
arc_p = (arc_c >> 1);
|
|
/* Valid range of arc_meta_limit: arc_meta_min - arc_c_max */
|
|
percent = MIN(zfs_arc_meta_limit_percent, 100);
|
|
arc_meta_limit = MAX(arc_meta_min, (percent * arc_c_max) / 100);
|
|
percent = MIN(zfs_arc_dnode_limit_percent, 100);
|
|
arc_dnode_limit = (percent * arc_meta_limit) / 100;
|
|
}
|
|
|
|
/* Valid range: 32M - <arc_c_max> */
|
|
if ((zfs_arc_min) && (zfs_arc_min != arc_c_min) &&
|
|
(zfs_arc_min >= 2ULL << SPA_MAXBLOCKSHIFT) &&
|
|
(zfs_arc_min <= arc_c_max)) {
|
|
arc_c_min = zfs_arc_min;
|
|
arc_c = MAX(arc_c, arc_c_min);
|
|
}
|
|
|
|
/* Valid range: 16M - <arc_c_max> */
|
|
if ((zfs_arc_meta_min) && (zfs_arc_meta_min != arc_meta_min) &&
|
|
(zfs_arc_meta_min >= 1ULL << SPA_MAXBLOCKSHIFT) &&
|
|
(zfs_arc_meta_min <= arc_c_max)) {
|
|
arc_meta_min = zfs_arc_meta_min;
|
|
arc_meta_limit = MAX(arc_meta_limit, arc_meta_min);
|
|
arc_dnode_limit = arc_meta_limit / 10;
|
|
}
|
|
|
|
/* Valid range: <arc_meta_min> - <arc_c_max> */
|
|
if ((zfs_arc_meta_limit) && (zfs_arc_meta_limit != arc_meta_limit) &&
|
|
(zfs_arc_meta_limit >= zfs_arc_meta_min) &&
|
|
(zfs_arc_meta_limit <= arc_c_max))
|
|
arc_meta_limit = zfs_arc_meta_limit;
|
|
|
|
/* Valid range: <arc_meta_min> - <arc_c_max> */
|
|
if ((zfs_arc_dnode_limit) && (zfs_arc_dnode_limit != arc_dnode_limit) &&
|
|
(zfs_arc_dnode_limit >= zfs_arc_meta_min) &&
|
|
(zfs_arc_dnode_limit <= arc_c_max))
|
|
arc_dnode_limit = zfs_arc_dnode_limit;
|
|
|
|
/* Valid range: 1 - N */
|
|
if (zfs_arc_grow_retry)
|
|
arc_grow_retry = zfs_arc_grow_retry;
|
|
|
|
/* Valid range: 1 - N */
|
|
if (zfs_arc_shrink_shift) {
|
|
arc_shrink_shift = zfs_arc_shrink_shift;
|
|
arc_no_grow_shift = MIN(arc_no_grow_shift, arc_shrink_shift -1);
|
|
}
|
|
|
|
/* Valid range: 1 - N */
|
|
if (zfs_arc_p_min_shift)
|
|
arc_p_min_shift = zfs_arc_p_min_shift;
|
|
|
|
/* Valid range: 1 - N ticks */
|
|
if (zfs_arc_min_prefetch_lifespan)
|
|
arc_min_prefetch_lifespan = zfs_arc_min_prefetch_lifespan;
|
|
|
|
/* Valid range: 0 - 100 */
|
|
if ((zfs_arc_lotsfree_percent >= 0) &&
|
|
(zfs_arc_lotsfree_percent <= 100))
|
|
arc_lotsfree_percent = zfs_arc_lotsfree_percent;
|
|
|
|
/* Valid range: 0 - <all physical memory> */
|
|
if ((zfs_arc_sys_free) && (zfs_arc_sys_free != arc_sys_free))
|
|
arc_sys_free = MIN(MAX(zfs_arc_sys_free, 0), allmem);
|
|
|
|
}
|
|
|
|
static void
|
|
arc_state_init(void)
|
|
{
|
|
arc_anon = &ARC_anon;
|
|
arc_mru = &ARC_mru;
|
|
arc_mru_ghost = &ARC_mru_ghost;
|
|
arc_mfu = &ARC_mfu;
|
|
arc_mfu_ghost = &ARC_mfu_ghost;
|
|
arc_l2c_only = &ARC_l2c_only;
|
|
|
|
arc_mru->arcs_list[ARC_BUFC_METADATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_mru->arcs_list[ARC_BUFC_DATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_mru_ghost->arcs_list[ARC_BUFC_METADATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_mru_ghost->arcs_list[ARC_BUFC_DATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_mfu->arcs_list[ARC_BUFC_METADATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_mfu->arcs_list[ARC_BUFC_DATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_mfu_ghost->arcs_list[ARC_BUFC_METADATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_mfu_ghost->arcs_list[ARC_BUFC_DATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_l2c_only->arcs_list[ARC_BUFC_METADATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
arc_l2c_only->arcs_list[ARC_BUFC_DATA] =
|
|
multilist_create(sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
|
|
arc_state_multilist_index_func);
|
|
|
|
refcount_create(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_create(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_create(&arc_mru->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_create(&arc_mru->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_create(&arc_mru_ghost->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_create(&arc_mru_ghost->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_create(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_create(&arc_mfu->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_create(&arc_mfu_ghost->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_create(&arc_mfu_ghost->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_create(&arc_l2c_only->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_create(&arc_l2c_only->arcs_esize[ARC_BUFC_DATA]);
|
|
|
|
refcount_create(&arc_anon->arcs_size);
|
|
refcount_create(&arc_mru->arcs_size);
|
|
refcount_create(&arc_mru_ghost->arcs_size);
|
|
refcount_create(&arc_mfu->arcs_size);
|
|
refcount_create(&arc_mfu_ghost->arcs_size);
|
|
refcount_create(&arc_l2c_only->arcs_size);
|
|
|
|
arc_anon->arcs_state = ARC_STATE_ANON;
|
|
arc_mru->arcs_state = ARC_STATE_MRU;
|
|
arc_mru_ghost->arcs_state = ARC_STATE_MRU_GHOST;
|
|
arc_mfu->arcs_state = ARC_STATE_MFU;
|
|
arc_mfu_ghost->arcs_state = ARC_STATE_MFU_GHOST;
|
|
arc_l2c_only->arcs_state = ARC_STATE_L2C_ONLY;
|
|
}
|
|
|
|
static void
|
|
arc_state_fini(void)
|
|
{
|
|
refcount_destroy(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_destroy(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_destroy(&arc_mru->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_destroy(&arc_mru->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_destroy(&arc_mru_ghost->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_destroy(&arc_mru_ghost->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_destroy(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_destroy(&arc_mfu->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_destroy(&arc_mfu_ghost->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_destroy(&arc_mfu_ghost->arcs_esize[ARC_BUFC_DATA]);
|
|
refcount_destroy(&arc_l2c_only->arcs_esize[ARC_BUFC_METADATA]);
|
|
refcount_destroy(&arc_l2c_only->arcs_esize[ARC_BUFC_DATA]);
|
|
|
|
refcount_destroy(&arc_anon->arcs_size);
|
|
refcount_destroy(&arc_mru->arcs_size);
|
|
refcount_destroy(&arc_mru_ghost->arcs_size);
|
|
refcount_destroy(&arc_mfu->arcs_size);
|
|
refcount_destroy(&arc_mfu_ghost->arcs_size);
|
|
refcount_destroy(&arc_l2c_only->arcs_size);
|
|
|
|
multilist_destroy(arc_mru->arcs_list[ARC_BUFC_METADATA]);
|
|
multilist_destroy(arc_mru_ghost->arcs_list[ARC_BUFC_METADATA]);
|
|
multilist_destroy(arc_mfu->arcs_list[ARC_BUFC_METADATA]);
|
|
multilist_destroy(arc_mfu_ghost->arcs_list[ARC_BUFC_METADATA]);
|
|
multilist_destroy(arc_mru->arcs_list[ARC_BUFC_DATA]);
|
|
multilist_destroy(arc_mru_ghost->arcs_list[ARC_BUFC_DATA]);
|
|
multilist_destroy(arc_mfu->arcs_list[ARC_BUFC_DATA]);
|
|
multilist_destroy(arc_mfu_ghost->arcs_list[ARC_BUFC_DATA]);
|
|
multilist_destroy(arc_l2c_only->arcs_list[ARC_BUFC_METADATA]);
|
|
multilist_destroy(arc_l2c_only->arcs_list[ARC_BUFC_DATA]);
|
|
}
|
|
|
|
uint64_t
|
|
arc_max_bytes(void)
|
|
{
|
|
return (arc_c_max);
|
|
}
|
|
|
|
void
|
|
arc_init(void)
|
|
{
|
|
uint64_t percent, allmem = arc_all_memory();
|
|
|
|
mutex_init(&arc_reclaim_lock, NULL, MUTEX_DEFAULT, NULL);
|
|
cv_init(&arc_reclaim_thread_cv, NULL, CV_DEFAULT, NULL);
|
|
cv_init(&arc_reclaim_waiters_cv, NULL, CV_DEFAULT, NULL);
|
|
|
|
/* Convert seconds to clock ticks */
|
|
arc_min_prefetch_lifespan = 1 * hz;
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Register a shrinker to support synchronous (direct) memory
|
|
* reclaim from the arc. This is done to prevent kswapd from
|
|
* swapping out pages when it is preferable to shrink the arc.
|
|
*/
|
|
spl_register_shrinker(&arc_shrinker);
|
|
|
|
/* Set to 1/64 of all memory or a minimum of 512K */
|
|
arc_sys_free = MAX(allmem / 64, (512 * 1024));
|
|
arc_need_free = 0;
|
|
#endif
|
|
|
|
/* Set max to 1/2 of all memory */
|
|
arc_c_max = allmem / 2;
|
|
|
|
/*
|
|
* In userland, there's only the memory pressure that we artificially
|
|
* create (see arc_available_memory()). Don't let arc_c get too
|
|
* small, because it can cause transactions to be larger than
|
|
* arc_c, causing arc_tempreserve_space() to fail.
|
|
*/
|
|
#ifndef _KERNEL
|
|
arc_c_min = MAX(arc_c_max / 2, 2ULL << SPA_MAXBLOCKSHIFT);
|
|
#else
|
|
arc_c_min = 2ULL << SPA_MAXBLOCKSHIFT;
|
|
#endif
|
|
|
|
arc_c = arc_c_max;
|
|
arc_p = (arc_c >> 1);
|
|
arc_size = 0;
|
|
|
|
/* Set min to 1/2 of arc_c_min */
|
|
arc_meta_min = 1ULL << SPA_MAXBLOCKSHIFT;
|
|
/* Initialize maximum observed usage to zero */
|
|
arc_meta_max = 0;
|
|
/*
|
|
* Set arc_meta_limit to a percent of arc_c_max with a floor of
|
|
* arc_meta_min, and a ceiling of arc_c_max.
|
|
*/
|
|
percent = MIN(zfs_arc_meta_limit_percent, 100);
|
|
arc_meta_limit = MAX(arc_meta_min, (percent * arc_c_max) / 100);
|
|
percent = MIN(zfs_arc_dnode_limit_percent, 100);
|
|
arc_dnode_limit = (percent * arc_meta_limit) / 100;
|
|
|
|
/* Apply user specified tunings */
|
|
arc_tuning_update();
|
|
|
|
/* if kmem_flags are set, lets try to use less memory */
|
|
if (kmem_debugging())
|
|
arc_c = arc_c / 2;
|
|
if (arc_c < arc_c_min)
|
|
arc_c = arc_c_min;
|
|
|
|
arc_state_init();
|
|
buf_init();
|
|
|
|
list_create(&arc_prune_list, sizeof (arc_prune_t),
|
|
offsetof(arc_prune_t, p_node));
|
|
mutex_init(&arc_prune_mtx, NULL, MUTEX_DEFAULT, NULL);
|
|
|
|
arc_prune_taskq = taskq_create("arc_prune", max_ncpus, defclsyspri,
|
|
max_ncpus, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC);
|
|
|
|
arc_reclaim_thread_exit = B_FALSE;
|
|
|
|
arc_ksp = kstat_create("zfs", 0, "arcstats", "misc", KSTAT_TYPE_NAMED,
|
|
sizeof (arc_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);
|
|
|
|
if (arc_ksp != NULL) {
|
|
arc_ksp->ks_data = &arc_stats;
|
|
arc_ksp->ks_update = arc_kstat_update;
|
|
kstat_install(arc_ksp);
|
|
}
|
|
|
|
(void) thread_create(NULL, 0, arc_reclaim_thread, NULL, 0, &p0,
|
|
TS_RUN, defclsyspri);
|
|
|
|
arc_dead = B_FALSE;
|
|
arc_warm = B_FALSE;
|
|
|
|
/*
|
|
* Calculate maximum amount of dirty data per pool.
|
|
*
|
|
* If it has been set by a module parameter, take that.
|
|
* Otherwise, use a percentage of physical memory defined by
|
|
* zfs_dirty_data_max_percent (default 10%) with a cap at
|
|
* zfs_dirty_data_max_max (default 4G or 25% of physical memory).
|
|
*/
|
|
if (zfs_dirty_data_max_max == 0)
|
|
zfs_dirty_data_max_max = MIN(4ULL * 1024 * 1024 * 1024,
|
|
allmem * zfs_dirty_data_max_max_percent / 100);
|
|
|
|
if (zfs_dirty_data_max == 0) {
|
|
zfs_dirty_data_max = allmem *
|
|
zfs_dirty_data_max_percent / 100;
|
|
zfs_dirty_data_max = MIN(zfs_dirty_data_max,
|
|
zfs_dirty_data_max_max);
|
|
}
|
|
}
|
|
|
|
void
|
|
arc_fini(void)
|
|
{
|
|
arc_prune_t *p;
|
|
|
|
#ifdef _KERNEL
|
|
spl_unregister_shrinker(&arc_shrinker);
|
|
#endif /* _KERNEL */
|
|
|
|
mutex_enter(&arc_reclaim_lock);
|
|
arc_reclaim_thread_exit = B_TRUE;
|
|
/*
|
|
* The reclaim thread will set arc_reclaim_thread_exit back to
|
|
* B_FALSE when it is finished exiting; we're waiting for that.
|
|
*/
|
|
while (arc_reclaim_thread_exit) {
|
|
cv_signal(&arc_reclaim_thread_cv);
|
|
cv_wait(&arc_reclaim_thread_cv, &arc_reclaim_lock);
|
|
}
|
|
mutex_exit(&arc_reclaim_lock);
|
|
|
|
/* Use B_TRUE to ensure *all* buffers are evicted */
|
|
arc_flush(NULL, B_TRUE);
|
|
|
|
arc_dead = B_TRUE;
|
|
|
|
if (arc_ksp != NULL) {
|
|
kstat_delete(arc_ksp);
|
|
arc_ksp = NULL;
|
|
}
|
|
|
|
taskq_wait(arc_prune_taskq);
|
|
taskq_destroy(arc_prune_taskq);
|
|
|
|
mutex_enter(&arc_prune_mtx);
|
|
while ((p = list_head(&arc_prune_list)) != NULL) {
|
|
list_remove(&arc_prune_list, p);
|
|
refcount_remove(&p->p_refcnt, &arc_prune_list);
|
|
refcount_destroy(&p->p_refcnt);
|
|
kmem_free(p, sizeof (*p));
|
|
}
|
|
mutex_exit(&arc_prune_mtx);
|
|
|
|
list_destroy(&arc_prune_list);
|
|
mutex_destroy(&arc_prune_mtx);
|
|
mutex_destroy(&arc_reclaim_lock);
|
|
cv_destroy(&arc_reclaim_thread_cv);
|
|
cv_destroy(&arc_reclaim_waiters_cv);
|
|
|
|
arc_state_fini();
|
|
buf_fini();
|
|
|
|
ASSERT0(arc_loaned_bytes);
|
|
}
|
|
|
|
/*
|
|
* Level 2 ARC
|
|
*
|
|
* The level 2 ARC (L2ARC) is a cache layer in-between main memory and disk.
|
|
* It uses dedicated storage devices to hold cached data, which are populated
|
|
* using large infrequent writes. The main role of this cache is to boost
|
|
* the performance of random read workloads. The intended L2ARC devices
|
|
* include short-stroked disks, solid state disks, and other media with
|
|
* substantially faster read latency than disk.
|
|
*
|
|
* +-----------------------+
|
|
* | ARC |
|
|
* +-----------------------+
|
|
* | ^ ^
|
|
* | | |
|
|
* l2arc_feed_thread() arc_read()
|
|
* | | |
|
|
* | l2arc read |
|
|
* V | |
|
|
* +---------------+ |
|
|
* | L2ARC | |
|
|
* +---------------+ |
|
|
* | ^ |
|
|
* l2arc_write() | |
|
|
* | | |
|
|
* V | |
|
|
* +-------+ +-------+
|
|
* | vdev | | vdev |
|
|
* | cache | | cache |
|
|
* +-------+ +-------+
|
|
* +=========+ .-----.
|
|
* : L2ARC : |-_____-|
|
|
* : devices : | Disks |
|
|
* +=========+ `-_____-'
|
|
*
|
|
* Read requests are satisfied from the following sources, in order:
|
|
*
|
|
* 1) ARC
|
|
* 2) vdev cache of L2ARC devices
|
|
* 3) L2ARC devices
|
|
* 4) vdev cache of disks
|
|
* 5) disks
|
|
*
|
|
* Some L2ARC device types exhibit extremely slow write performance.
|
|
* To accommodate for this there are some significant differences between
|
|
* the L2ARC and traditional cache design:
|
|
*
|
|
* 1. There is no eviction path from the ARC to the L2ARC. Evictions from
|
|
* the ARC behave as usual, freeing buffers and placing headers on ghost
|
|
* lists. The ARC does not send buffers to the L2ARC during eviction as
|
|
* this would add inflated write latencies for all ARC memory pressure.
|
|
*
|
|
* 2. The L2ARC attempts to cache data from the ARC before it is evicted.
|
|
* It does this by periodically scanning buffers from the eviction-end of
|
|
* the MFU and MRU ARC lists, copying them to the L2ARC devices if they are
|
|
* not already there. It scans until a headroom of buffers is satisfied,
|
|
* which itself is a buffer for ARC eviction. If a compressible buffer is
|
|
* found during scanning and selected for writing to an L2ARC device, we
|
|
* temporarily boost scanning headroom during the next scan cycle to make
|
|
* sure we adapt to compression effects (which might significantly reduce
|
|
* the data volume we write to L2ARC). The thread that does this is
|
|
* l2arc_feed_thread(), illustrated below; example sizes are included to
|
|
* provide a better sense of ratio than this diagram:
|
|
*
|
|
* head --> tail
|
|
* +---------------------+----------+
|
|
* ARC_mfu |:::::#:::::::::::::::|o#o###o###|-->. # already on L2ARC
|
|
* +---------------------+----------+ | o L2ARC eligible
|
|
* ARC_mru |:#:::::::::::::::::::|#o#ooo####|-->| : ARC buffer
|
|
* +---------------------+----------+ |
|
|
* 15.9 Gbytes ^ 32 Mbytes |
|
|
* headroom |
|
|
* l2arc_feed_thread()
|
|
* |
|
|
* l2arc write hand <--[oooo]--'
|
|
* | 8 Mbyte
|
|
* | write max
|
|
* V
|
|
* +==============================+
|
|
* L2ARC dev |####|#|###|###| |####| ... |
|
|
* +==============================+
|
|
* 32 Gbytes
|
|
*
|
|
* 3. If an ARC buffer is copied to the L2ARC but then hit instead of
|
|
* evicted, then the L2ARC has cached a buffer much sooner than it probably
|
|
* needed to, potentially wasting L2ARC device bandwidth and storage. It is
|
|
* safe to say that this is an uncommon case, since buffers at the end of
|
|
* the ARC lists have moved there due to inactivity.
|
|
*
|
|
* 4. If the ARC evicts faster than the L2ARC can maintain a headroom,
|
|
* then the L2ARC simply misses copying some buffers. This serves as a
|
|
* pressure valve to prevent heavy read workloads from both stalling the ARC
|
|
* with waits and clogging the L2ARC with writes. This also helps prevent
|
|
* the potential for the L2ARC to churn if it attempts to cache content too
|
|
* quickly, such as during backups of the entire pool.
|
|
*
|
|
* 5. After system boot and before the ARC has filled main memory, there are
|
|
* no evictions from the ARC and so the tails of the ARC_mfu and ARC_mru
|
|
* lists can remain mostly static. Instead of searching from tail of these
|
|
* lists as pictured, the l2arc_feed_thread() will search from the list heads
|
|
* for eligible buffers, greatly increasing its chance of finding them.
|
|
*
|
|
* The L2ARC device write speed is also boosted during this time so that
|
|
* the L2ARC warms up faster. Since there have been no ARC evictions yet,
|
|
* there are no L2ARC reads, and no fear of degrading read performance
|
|
* through increased writes.
|
|
*
|
|
* 6. Writes to the L2ARC devices are grouped and sent in-sequence, so that
|
|
* the vdev queue can aggregate them into larger and fewer writes. Each
|
|
* device is written to in a rotor fashion, sweeping writes through
|
|
* available space then repeating.
|
|
*
|
|
* 7. The L2ARC does not store dirty content. It never needs to flush
|
|
* write buffers back to disk based storage.
|
|
*
|
|
* 8. If an ARC buffer is written (and dirtied) which also exists in the
|
|
* L2ARC, the now stale L2ARC buffer is immediately dropped.
|
|
*
|
|
* The performance of the L2ARC can be tweaked by a number of tunables, which
|
|
* may be necessary for different workloads:
|
|
*
|
|
* l2arc_write_max max write bytes per interval
|
|
* l2arc_write_boost extra write bytes during device warmup
|
|
* l2arc_noprefetch skip caching prefetched buffers
|
|
* l2arc_headroom number of max device writes to precache
|
|
* l2arc_headroom_boost when we find compressed buffers during ARC
|
|
* scanning, we multiply headroom by this
|
|
* percentage factor for the next scan cycle,
|
|
* since more compressed buffers are likely to
|
|
* be present
|
|
* l2arc_feed_secs seconds between L2ARC writing
|
|
*
|
|
* Tunables may be removed or added as future performance improvements are
|
|
* integrated, and also may become zpool properties.
|
|
*
|
|
* There are three key functions that control how the L2ARC warms up:
|
|
*
|
|
* l2arc_write_eligible() check if a buffer is eligible to cache
|
|
* l2arc_write_size() calculate how much to write
|
|
* l2arc_write_interval() calculate sleep delay between writes
|
|
*
|
|
* These three functions determine what to write, how much, and how quickly
|
|
* to send writes.
|
|
*/
|
|
|
|
static boolean_t
|
|
l2arc_write_eligible(uint64_t spa_guid, arc_buf_hdr_t *hdr)
|
|
{
|
|
/*
|
|
* A buffer is *not* eligible for the L2ARC if it:
|
|
* 1. belongs to a different spa.
|
|
* 2. is already cached on the L2ARC.
|
|
* 3. has an I/O in progress (it may be an incomplete read).
|
|
* 4. is flagged not eligible (zfs property).
|
|
*/
|
|
if (hdr->b_spa != spa_guid || HDR_HAS_L2HDR(hdr) ||
|
|
HDR_IO_IN_PROGRESS(hdr) || !HDR_L2CACHE(hdr))
|
|
return (B_FALSE);
|
|
|
|
return (B_TRUE);
|
|
}
|
|
|
|
static uint64_t
|
|
l2arc_write_size(void)
|
|
{
|
|
uint64_t size;
|
|
|
|
/*
|
|
* Make sure our globals have meaningful values in case the user
|
|
* altered them.
|
|
*/
|
|
size = l2arc_write_max;
|
|
if (size == 0) {
|
|
cmn_err(CE_NOTE, "Bad value for l2arc_write_max, value must "
|
|
"be greater than zero, resetting it to the default (%d)",
|
|
L2ARC_WRITE_SIZE);
|
|
size = l2arc_write_max = L2ARC_WRITE_SIZE;
|
|
}
|
|
|
|
if (arc_warm == B_FALSE)
|
|
size += l2arc_write_boost;
|
|
|
|
return (size);
|
|
|
|
}
|
|
|
|
static clock_t
|
|
l2arc_write_interval(clock_t began, uint64_t wanted, uint64_t wrote)
|
|
{
|
|
clock_t interval, next, now;
|
|
|
|
/*
|
|
* If the ARC lists are busy, increase our write rate; if the
|
|
* lists are stale, idle back. This is achieved by checking
|
|
* how much we previously wrote - if it was more than half of
|
|
* what we wanted, schedule the next write much sooner.
|
|
*/
|
|
if (l2arc_feed_again && wrote > (wanted / 2))
|
|
interval = (hz * l2arc_feed_min_ms) / 1000;
|
|
else
|
|
interval = hz * l2arc_feed_secs;
|
|
|
|
now = ddi_get_lbolt();
|
|
next = MAX(now, MIN(now + interval, began + interval));
|
|
|
|
return (next);
|
|
}
|
|
|
|
/*
|
|
* Cycle through L2ARC devices. This is how L2ARC load balances.
|
|
* If a device is returned, this also returns holding the spa config lock.
|
|
*/
|
|
static l2arc_dev_t *
|
|
l2arc_dev_get_next(void)
|
|
{
|
|
l2arc_dev_t *first, *next = NULL;
|
|
|
|
/*
|
|
* Lock out the removal of spas (spa_namespace_lock), then removal
|
|
* of cache devices (l2arc_dev_mtx). Once a device has been selected,
|
|
* both locks will be dropped and a spa config lock held instead.
|
|
*/
|
|
mutex_enter(&spa_namespace_lock);
|
|
mutex_enter(&l2arc_dev_mtx);
|
|
|
|
/* if there are no vdevs, there is nothing to do */
|
|
if (l2arc_ndev == 0)
|
|
goto out;
|
|
|
|
first = NULL;
|
|
next = l2arc_dev_last;
|
|
do {
|
|
/* loop around the list looking for a non-faulted vdev */
|
|
if (next == NULL) {
|
|
next = list_head(l2arc_dev_list);
|
|
} else {
|
|
next = list_next(l2arc_dev_list, next);
|
|
if (next == NULL)
|
|
next = list_head(l2arc_dev_list);
|
|
}
|
|
|
|
/* if we have come back to the start, bail out */
|
|
if (first == NULL)
|
|
first = next;
|
|
else if (next == first)
|
|
break;
|
|
|
|
} while (vdev_is_dead(next->l2ad_vdev));
|
|
|
|
/* if we were unable to find any usable vdevs, return NULL */
|
|
if (vdev_is_dead(next->l2ad_vdev))
|
|
next = NULL;
|
|
|
|
l2arc_dev_last = next;
|
|
|
|
out:
|
|
mutex_exit(&l2arc_dev_mtx);
|
|
|
|
/*
|
|
* Grab the config lock to prevent the 'next' device from being
|
|
* removed while we are writing to it.
|
|
*/
|
|
if (next != NULL)
|
|
spa_config_enter(next->l2ad_spa, SCL_L2ARC, next, RW_READER);
|
|
mutex_exit(&spa_namespace_lock);
|
|
|
|
return (next);
|
|
}
|
|
|
|
/*
|
|
* Free buffers that were tagged for destruction.
|
|
*/
|
|
static void
|
|
l2arc_do_free_on_write(void)
|
|
{
|
|
list_t *buflist;
|
|
l2arc_data_free_t *df, *df_prev;
|
|
|
|
mutex_enter(&l2arc_free_on_write_mtx);
|
|
buflist = l2arc_free_on_write;
|
|
|
|
for (df = list_tail(buflist); df; df = df_prev) {
|
|
df_prev = list_prev(buflist, df);
|
|
ASSERT3P(df->l2df_abd, !=, NULL);
|
|
abd_free(df->l2df_abd);
|
|
list_remove(buflist, df);
|
|
kmem_free(df, sizeof (l2arc_data_free_t));
|
|
}
|
|
|
|
mutex_exit(&l2arc_free_on_write_mtx);
|
|
}
|
|
|
|
/*
|
|
* A write to a cache device has completed. Update all headers to allow
|
|
* reads from these buffers to begin.
|
|
*/
|
|
static void
|
|
l2arc_write_done(zio_t *zio)
|
|
{
|
|
l2arc_write_callback_t *cb;
|
|
l2arc_dev_t *dev;
|
|
list_t *buflist;
|
|
arc_buf_hdr_t *head, *hdr, *hdr_prev;
|
|
kmutex_t *hash_lock;
|
|
int64_t bytes_dropped = 0;
|
|
|
|
cb = zio->io_private;
|
|
ASSERT3P(cb, !=, NULL);
|
|
dev = cb->l2wcb_dev;
|
|
ASSERT3P(dev, !=, NULL);
|
|
head = cb->l2wcb_head;
|
|
ASSERT3P(head, !=, NULL);
|
|
buflist = &dev->l2ad_buflist;
|
|
ASSERT3P(buflist, !=, NULL);
|
|
DTRACE_PROBE2(l2arc__iodone, zio_t *, zio,
|
|
l2arc_write_callback_t *, cb);
|
|
|
|
if (zio->io_error != 0)
|
|
ARCSTAT_BUMP(arcstat_l2_writes_error);
|
|
|
|
/*
|
|
* All writes completed, or an error was hit.
|
|
*/
|
|
top:
|
|
mutex_enter(&dev->l2ad_mtx);
|
|
for (hdr = list_prev(buflist, head); hdr; hdr = hdr_prev) {
|
|
hdr_prev = list_prev(buflist, hdr);
|
|
|
|
hash_lock = HDR_LOCK(hdr);
|
|
|
|
/*
|
|
* We cannot use mutex_enter or else we can deadlock
|
|
* with l2arc_write_buffers (due to swapping the order
|
|
* the hash lock and l2ad_mtx are taken).
|
|
*/
|
|
if (!mutex_tryenter(hash_lock)) {
|
|
/*
|
|
* Missed the hash lock. We must retry so we
|
|
* don't leave the ARC_FLAG_L2_WRITING bit set.
|
|
*/
|
|
ARCSTAT_BUMP(arcstat_l2_writes_lock_retry);
|
|
|
|
/*
|
|
* We don't want to rescan the headers we've
|
|
* already marked as having been written out, so
|
|
* we reinsert the head node so we can pick up
|
|
* where we left off.
|
|
*/
|
|
list_remove(buflist, head);
|
|
list_insert_after(buflist, hdr, head);
|
|
|
|
mutex_exit(&dev->l2ad_mtx);
|
|
|
|
/*
|
|
* We wait for the hash lock to become available
|
|
* to try and prevent busy waiting, and increase
|
|
* the chance we'll be able to acquire the lock
|
|
* the next time around.
|
|
*/
|
|
mutex_enter(hash_lock);
|
|
mutex_exit(hash_lock);
|
|
goto top;
|
|
}
|
|
|
|
/*
|
|
* We could not have been moved into the arc_l2c_only
|
|
* state while in-flight due to our ARC_FLAG_L2_WRITING
|
|
* bit being set. Let's just ensure that's being enforced.
|
|
*/
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
/*
|
|
* Skipped - drop L2ARC entry and mark the header as no
|
|
* longer L2 eligibile.
|
|
*/
|
|
if (zio->io_error != 0) {
|
|
/*
|
|
* Error - drop L2ARC entry.
|
|
*/
|
|
list_remove(buflist, hdr);
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_HAS_L2HDR);
|
|
|
|
ARCSTAT_INCR(arcstat_l2_asize, -arc_hdr_size(hdr));
|
|
ARCSTAT_INCR(arcstat_l2_size, -HDR_GET_LSIZE(hdr));
|
|
|
|
bytes_dropped += arc_hdr_size(hdr);
|
|
(void) refcount_remove_many(&dev->l2ad_alloc,
|
|
arc_hdr_size(hdr), hdr);
|
|
}
|
|
|
|
/*
|
|
* Allow ARC to begin reads and ghost list evictions to
|
|
* this L2ARC entry.
|
|
*/
|
|
arc_hdr_clear_flags(hdr, ARC_FLAG_L2_WRITING);
|
|
|
|
mutex_exit(hash_lock);
|
|
}
|
|
|
|
atomic_inc_64(&l2arc_writes_done);
|
|
list_remove(buflist, head);
|
|
ASSERT(!HDR_HAS_L1HDR(head));
|
|
kmem_cache_free(hdr_l2only_cache, head);
|
|
mutex_exit(&dev->l2ad_mtx);
|
|
|
|
vdev_space_update(dev->l2ad_vdev, -bytes_dropped, 0, 0);
|
|
|
|
l2arc_do_free_on_write();
|
|
|
|
kmem_free(cb, sizeof (l2arc_write_callback_t));
|
|
}
|
|
|
|
/*
|
|
* A read to a cache device completed. Validate buffer contents before
|
|
* handing over to the regular ARC routines.
|
|
*/
|
|
static void
|
|
l2arc_read_done(zio_t *zio)
|
|
{
|
|
l2arc_read_callback_t *cb;
|
|
arc_buf_hdr_t *hdr;
|
|
kmutex_t *hash_lock;
|
|
boolean_t valid_cksum;
|
|
|
|
ASSERT3P(zio->io_vd, !=, NULL);
|
|
ASSERT(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE);
|
|
|
|
spa_config_exit(zio->io_spa, SCL_L2ARC, zio->io_vd);
|
|
|
|
cb = zio->io_private;
|
|
ASSERT3P(cb, !=, NULL);
|
|
hdr = cb->l2rcb_hdr;
|
|
ASSERT3P(hdr, !=, NULL);
|
|
|
|
hash_lock = HDR_LOCK(hdr);
|
|
mutex_enter(hash_lock);
|
|
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr));
|
|
|
|
/*
|
|
* If the data was read into a temporary buffer,
|
|
* move it and free the buffer.
|
|
*/
|
|
if (cb->l2rcb_abd != NULL) {
|
|
ASSERT3U(arc_hdr_size(hdr), <, zio->io_size);
|
|
if (zio->io_error == 0) {
|
|
abd_copy(hdr->b_l1hdr.b_pabd, cb->l2rcb_abd,
|
|
arc_hdr_size(hdr));
|
|
}
|
|
|
|
/*
|
|
* The following must be done regardless of whether
|
|
* there was an error:
|
|
* - free the temporary buffer
|
|
* - point zio to the real ARC buffer
|
|
* - set zio size accordingly
|
|
* These are required because zio is either re-used for
|
|
* an I/O of the block in the case of the error
|
|
* or the zio is passed to arc_read_done() and it
|
|
* needs real data.
|
|
*/
|
|
abd_free(cb->l2rcb_abd);
|
|
zio->io_size = zio->io_orig_size = arc_hdr_size(hdr);
|
|
zio->io_abd = zio->io_orig_abd = hdr->b_l1hdr.b_pabd;
|
|
}
|
|
|
|
ASSERT3P(zio->io_abd, !=, NULL);
|
|
|
|
/*
|
|
* Check this survived the L2ARC journey.
|
|
*/
|
|
ASSERT3P(zio->io_abd, ==, hdr->b_l1hdr.b_pabd);
|
|
zio->io_bp_copy = cb->l2rcb_bp; /* XXX fix in L2ARC 2.0 */
|
|
zio->io_bp = &zio->io_bp_copy; /* XXX fix in L2ARC 2.0 */
|
|
|
|
valid_cksum = arc_cksum_is_equal(hdr, zio);
|
|
if (valid_cksum && zio->io_error == 0 && !HDR_L2_EVICTED(hdr)) {
|
|
mutex_exit(hash_lock);
|
|
zio->io_private = hdr;
|
|
arc_read_done(zio);
|
|
} else {
|
|
mutex_exit(hash_lock);
|
|
/*
|
|
* Buffer didn't survive caching. Increment stats and
|
|
* reissue to the original storage device.
|
|
*/
|
|
if (zio->io_error != 0) {
|
|
ARCSTAT_BUMP(arcstat_l2_io_error);
|
|
} else {
|
|
zio->io_error = SET_ERROR(EIO);
|
|
}
|
|
if (!valid_cksum)
|
|
ARCSTAT_BUMP(arcstat_l2_cksum_bad);
|
|
|
|
/*
|
|
* If there's no waiter, issue an async i/o to the primary
|
|
* storage now. If there *is* a waiter, the caller must
|
|
* issue the i/o in a context where it's OK to block.
|
|
*/
|
|
if (zio->io_waiter == NULL) {
|
|
zio_t *pio = zio_unique_parent(zio);
|
|
|
|
ASSERT(!pio || pio->io_child_type == ZIO_CHILD_LOGICAL);
|
|
|
|
zio_nowait(zio_read(pio, zio->io_spa, zio->io_bp,
|
|
hdr->b_l1hdr.b_pabd, zio->io_size, arc_read_done,
|
|
hdr, zio->io_priority, cb->l2rcb_flags,
|
|
&cb->l2rcb_zb));
|
|
}
|
|
}
|
|
|
|
kmem_free(cb, sizeof (l2arc_read_callback_t));
|
|
}
|
|
|
|
/*
|
|
* This is the list priority from which the L2ARC will search for pages to
|
|
* cache. This is used within loops (0..3) to cycle through lists in the
|
|
* desired order. This order can have a significant effect on cache
|
|
* performance.
|
|
*
|
|
* Currently the metadata lists are hit first, MFU then MRU, followed by
|
|
* the data lists. This function returns a locked list, and also returns
|
|
* the lock pointer.
|
|
*/
|
|
static multilist_sublist_t *
|
|
l2arc_sublist_lock(int list_num)
|
|
{
|
|
multilist_t *ml = NULL;
|
|
unsigned int idx;
|
|
|
|
ASSERT(list_num >= 0 && list_num < L2ARC_FEED_TYPES);
|
|
|
|
switch (list_num) {
|
|
case 0:
|
|
ml = arc_mfu->arcs_list[ARC_BUFC_METADATA];
|
|
break;
|
|
case 1:
|
|
ml = arc_mru->arcs_list[ARC_BUFC_METADATA];
|
|
break;
|
|
case 2:
|
|
ml = arc_mfu->arcs_list[ARC_BUFC_DATA];
|
|
break;
|
|
case 3:
|
|
ml = arc_mru->arcs_list[ARC_BUFC_DATA];
|
|
break;
|
|
default:
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Return a randomly-selected sublist. This is acceptable
|
|
* because the caller feeds only a little bit of data for each
|
|
* call (8MB). Subsequent calls will result in different
|
|
* sublists being selected.
|
|
*/
|
|
idx = multilist_get_random_index(ml);
|
|
return (multilist_sublist_lock(ml, idx));
|
|
}
|
|
|
|
/*
|
|
* Evict buffers from the device write hand to the distance specified in
|
|
* bytes. This distance may span populated buffers, it may span nothing.
|
|
* This is clearing a region on the L2ARC device ready for writing.
|
|
* If the 'all' boolean is set, every buffer is evicted.
|
|
*/
|
|
static void
|
|
l2arc_evict(l2arc_dev_t *dev, uint64_t distance, boolean_t all)
|
|
{
|
|
list_t *buflist;
|
|
arc_buf_hdr_t *hdr, *hdr_prev;
|
|
kmutex_t *hash_lock;
|
|
uint64_t taddr;
|
|
|
|
buflist = &dev->l2ad_buflist;
|
|
|
|
if (!all && dev->l2ad_first) {
|
|
/*
|
|
* This is the first sweep through the device. There is
|
|
* nothing to evict.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if (dev->l2ad_hand >= (dev->l2ad_end - (2 * distance))) {
|
|
/*
|
|
* When nearing the end of the device, evict to the end
|
|
* before the device write hand jumps to the start.
|
|
*/
|
|
taddr = dev->l2ad_end;
|
|
} else {
|
|
taddr = dev->l2ad_hand + distance;
|
|
}
|
|
DTRACE_PROBE4(l2arc__evict, l2arc_dev_t *, dev, list_t *, buflist,
|
|
uint64_t, taddr, boolean_t, all);
|
|
|
|
top:
|
|
mutex_enter(&dev->l2ad_mtx);
|
|
for (hdr = list_tail(buflist); hdr; hdr = hdr_prev) {
|
|
hdr_prev = list_prev(buflist, hdr);
|
|
|
|
hash_lock = HDR_LOCK(hdr);
|
|
|
|
/*
|
|
* We cannot use mutex_enter or else we can deadlock
|
|
* with l2arc_write_buffers (due to swapping the order
|
|
* the hash lock and l2ad_mtx are taken).
|
|
*/
|
|
if (!mutex_tryenter(hash_lock)) {
|
|
/*
|
|
* Missed the hash lock. Retry.
|
|
*/
|
|
ARCSTAT_BUMP(arcstat_l2_evict_lock_retry);
|
|
mutex_exit(&dev->l2ad_mtx);
|
|
mutex_enter(hash_lock);
|
|
mutex_exit(hash_lock);
|
|
goto top;
|
|
}
|
|
|
|
if (HDR_L2_WRITE_HEAD(hdr)) {
|
|
/*
|
|
* We hit a write head node. Leave it for
|
|
* l2arc_write_done().
|
|
*/
|
|
list_remove(buflist, hdr);
|
|
mutex_exit(hash_lock);
|
|
continue;
|
|
}
|
|
|
|
if (!all && HDR_HAS_L2HDR(hdr) &&
|
|
(hdr->b_l2hdr.b_daddr > taddr ||
|
|
hdr->b_l2hdr.b_daddr < dev->l2ad_hand)) {
|
|
/*
|
|
* We've evicted to the target address,
|
|
* or the end of the device.
|
|
*/
|
|
mutex_exit(hash_lock);
|
|
break;
|
|
}
|
|
|
|
ASSERT(HDR_HAS_L2HDR(hdr));
|
|
if (!HDR_HAS_L1HDR(hdr)) {
|
|
ASSERT(!HDR_L2_READING(hdr));
|
|
/*
|
|
* This doesn't exist in the ARC. Destroy.
|
|
* arc_hdr_destroy() will call list_remove()
|
|
* and decrement arcstat_l2_size.
|
|
*/
|
|
arc_change_state(arc_anon, hdr, hash_lock);
|
|
arc_hdr_destroy(hdr);
|
|
} else {
|
|
ASSERT(hdr->b_l1hdr.b_state != arc_l2c_only);
|
|
ARCSTAT_BUMP(arcstat_l2_evict_l1cached);
|
|
/*
|
|
* Invalidate issued or about to be issued
|
|
* reads, since we may be about to write
|
|
* over this location.
|
|
*/
|
|
if (HDR_L2_READING(hdr)) {
|
|
ARCSTAT_BUMP(arcstat_l2_evict_reading);
|
|
arc_hdr_set_flags(hdr, ARC_FLAG_L2_EVICTED);
|
|
}
|
|
|
|
/* Ensure this header has finished being written */
|
|
ASSERT(!HDR_L2_WRITING(hdr));
|
|
|
|
arc_hdr_l2hdr_destroy(hdr);
|
|
}
|
|
mutex_exit(hash_lock);
|
|
}
|
|
mutex_exit(&dev->l2ad_mtx);
|
|
}
|
|
|
|
/*
|
|
* Find and write ARC buffers to the L2ARC device.
|
|
*
|
|
* An ARC_FLAG_L2_WRITING flag is set so that the L2ARC buffers are not valid
|
|
* for reading until they have completed writing.
|
|
* The headroom_boost is an in-out parameter used to maintain headroom boost
|
|
* state between calls to this function.
|
|
*
|
|
* Returns the number of bytes actually written (which may be smaller than
|
|
* the delta by which the device hand has changed due to alignment).
|
|
*/
|
|
static uint64_t
|
|
l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
|
|
{
|
|
arc_buf_hdr_t *hdr, *hdr_prev, *head;
|
|
uint64_t write_asize, write_psize, write_sz, headroom;
|
|
boolean_t full;
|
|
l2arc_write_callback_t *cb;
|
|
zio_t *pio, *wzio;
|
|
uint64_t guid = spa_load_guid(spa);
|
|
int try;
|
|
|
|
ASSERT3P(dev->l2ad_vdev, !=, NULL);
|
|
|
|
pio = NULL;
|
|
write_sz = write_asize = write_psize = 0;
|
|
full = B_FALSE;
|
|
head = kmem_cache_alloc(hdr_l2only_cache, KM_PUSHPAGE);
|
|
arc_hdr_set_flags(head, ARC_FLAG_L2_WRITE_HEAD | ARC_FLAG_HAS_L2HDR);
|
|
|
|
/*
|
|
* Copy buffers for L2ARC writing.
|
|
*/
|
|
for (try = 0; try < L2ARC_FEED_TYPES; try++) {
|
|
multilist_sublist_t *mls = l2arc_sublist_lock(try);
|
|
uint64_t passed_sz = 0;
|
|
|
|
VERIFY3P(mls, !=, NULL);
|
|
|
|
/*
|
|
* L2ARC fast warmup.
|
|
*
|
|
* Until the ARC is warm and starts to evict, read from the
|
|
* head of the ARC lists rather than the tail.
|
|
*/
|
|
if (arc_warm == B_FALSE)
|
|
hdr = multilist_sublist_head(mls);
|
|
else
|
|
hdr = multilist_sublist_tail(mls);
|
|
|
|
headroom = target_sz * l2arc_headroom;
|
|
if (zfs_compressed_arc_enabled)
|
|
headroom = (headroom * l2arc_headroom_boost) / 100;
|
|
|
|
for (; hdr; hdr = hdr_prev) {
|
|
kmutex_t *hash_lock;
|
|
uint64_t asize, size;
|
|
abd_t *to_write;
|
|
|
|
if (arc_warm == B_FALSE)
|
|
hdr_prev = multilist_sublist_next(mls, hdr);
|
|
else
|
|
hdr_prev = multilist_sublist_prev(mls, hdr);
|
|
|
|
hash_lock = HDR_LOCK(hdr);
|
|
if (!mutex_tryenter(hash_lock)) {
|
|
/*
|
|
* Skip this buffer rather than waiting.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
passed_sz += HDR_GET_LSIZE(hdr);
|
|
if (passed_sz > headroom) {
|
|
/*
|
|
* Searched too far.
|
|
*/
|
|
mutex_exit(hash_lock);
|
|
break;
|
|
}
|
|
|
|
if (!l2arc_write_eligible(guid, hdr)) {
|
|
mutex_exit(hash_lock);
|
|
continue;
|
|
}
|
|
|
|
if ((write_asize + HDR_GET_LSIZE(hdr)) > target_sz) {
|
|
full = B_TRUE;
|
|
mutex_exit(hash_lock);
|
|
break;
|
|
}
|
|
|
|
if (pio == NULL) {
|
|
/*
|
|
* Insert a dummy header on the buflist so
|
|
* l2arc_write_done() can find where the
|
|
* write buffers begin without searching.
|
|
*/
|
|
mutex_enter(&dev->l2ad_mtx);
|
|
list_insert_head(&dev->l2ad_buflist, head);
|
|
mutex_exit(&dev->l2ad_mtx);
|
|
|
|
cb = kmem_alloc(
|
|
sizeof (l2arc_write_callback_t), KM_SLEEP);
|
|
cb->l2wcb_dev = dev;
|
|
cb->l2wcb_head = head;
|
|
pio = zio_root(spa, l2arc_write_done, cb,
|
|
ZIO_FLAG_CANFAIL);
|
|
}
|
|
|
|
hdr->b_l2hdr.b_dev = dev;
|
|
hdr->b_l2hdr.b_hits = 0;
|
|
|
|
hdr->b_l2hdr.b_daddr = dev->l2ad_hand;
|
|
arc_hdr_set_flags(hdr,
|
|
ARC_FLAG_L2_WRITING | ARC_FLAG_HAS_L2HDR);
|
|
|
|
mutex_enter(&dev->l2ad_mtx);
|
|
list_insert_head(&dev->l2ad_buflist, hdr);
|
|
mutex_exit(&dev->l2ad_mtx);
|
|
|
|
/*
|
|
* We rely on the L1 portion of the header below, so
|
|
* it's invalid for this header to have been evicted out
|
|
* of the ghost cache, prior to being written out. The
|
|
* ARC_FLAG_L2_WRITING bit ensures this won't happen.
|
|
*/
|
|
ASSERT(HDR_HAS_L1HDR(hdr));
|
|
|
|
ASSERT3U(HDR_GET_PSIZE(hdr), >, 0);
|
|
ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
|
|
ASSERT3U(arc_hdr_size(hdr), >, 0);
|
|
size = arc_hdr_size(hdr);
|
|
|
|
(void) refcount_add_many(&dev->l2ad_alloc, size, hdr);
|
|
|
|
/*
|
|
* Normally the L2ARC can use the hdr's data, but if
|
|
* we're sharing data between the hdr and one of its
|
|
* bufs, L2ARC needs its own copy of the data so that
|
|
* the ZIO below can't race with the buf consumer.
|
|
* Another case where we need to create a copy of the
|
|
* data is when the buffer size is not device-aligned
|
|
* and we need to pad the block to make it such.
|
|
* That also keeps the clock hand suitably aligned.
|
|
*
|
|
* To ensure that the copy will be available for the
|
|
* lifetime of the ZIO and be cleaned up afterwards, we
|
|
* add it to the l2arc_free_on_write queue.
|
|
*/
|
|
asize = vdev_psize_to_asize(dev->l2ad_vdev, size);
|
|
if (!HDR_SHARED_DATA(hdr) && size == asize) {
|
|
to_write = hdr->b_l1hdr.b_pabd;
|
|
} else {
|
|
to_write = abd_alloc_for_io(asize,
|
|
HDR_ISTYPE_METADATA(hdr));
|
|
abd_copy(to_write, hdr->b_l1hdr.b_pabd, size);
|
|
if (asize != size) {
|
|
abd_zero_off(to_write, size,
|
|
asize - size);
|
|
}
|
|
l2arc_free_abd_on_write(to_write, size,
|
|
arc_buf_type(hdr));
|
|
}
|
|
wzio = zio_write_phys(pio, dev->l2ad_vdev,
|
|
hdr->b_l2hdr.b_daddr, asize, to_write,
|
|
ZIO_CHECKSUM_OFF, NULL, hdr,
|
|
ZIO_PRIORITY_ASYNC_WRITE,
|
|
ZIO_FLAG_CANFAIL, B_FALSE);
|
|
|
|
write_sz += HDR_GET_LSIZE(hdr);
|
|
DTRACE_PROBE2(l2arc__write, vdev_t *, dev->l2ad_vdev,
|
|
zio_t *, wzio);
|
|
|
|
write_asize += size;
|
|
write_psize += asize;
|
|
dev->l2ad_hand += asize;
|
|
|
|
mutex_exit(hash_lock);
|
|
|
|
(void) zio_nowait(wzio);
|
|
}
|
|
|
|
multilist_sublist_unlock(mls);
|
|
|
|
if (full == B_TRUE)
|
|
break;
|
|
}
|
|
|
|
/* No buffers selected for writing? */
|
|
if (pio == NULL) {
|
|
ASSERT0(write_sz);
|
|
ASSERT(!HDR_HAS_L1HDR(head));
|
|
kmem_cache_free(hdr_l2only_cache, head);
|
|
return (0);
|
|
}
|
|
|
|
ASSERT3U(write_asize, <=, target_sz);
|
|
ARCSTAT_BUMP(arcstat_l2_writes_sent);
|
|
ARCSTAT_INCR(arcstat_l2_write_bytes, write_asize);
|
|
ARCSTAT_INCR(arcstat_l2_size, write_sz);
|
|
ARCSTAT_INCR(arcstat_l2_asize, write_asize);
|
|
vdev_space_update(dev->l2ad_vdev, write_asize, 0, 0);
|
|
|
|
/*
|
|
* Bump device hand to the device start if it is approaching the end.
|
|
* l2arc_evict() will already have evicted ahead for this case.
|
|
*/
|
|
if (dev->l2ad_hand >= (dev->l2ad_end - target_sz)) {
|
|
dev->l2ad_hand = dev->l2ad_start;
|
|
dev->l2ad_first = B_FALSE;
|
|
}
|
|
|
|
dev->l2ad_writing = B_TRUE;
|
|
(void) zio_wait(pio);
|
|
dev->l2ad_writing = B_FALSE;
|
|
|
|
return (write_asize);
|
|
}
|
|
|
|
/*
|
|
* This thread feeds the L2ARC at regular intervals. This is the beating
|
|
* heart of the L2ARC.
|
|
*/
|
|
static void
|
|
l2arc_feed_thread(void)
|
|
{
|
|
callb_cpr_t cpr;
|
|
l2arc_dev_t *dev;
|
|
spa_t *spa;
|
|
uint64_t size, wrote;
|
|
clock_t begin, next = ddi_get_lbolt();
|
|
fstrans_cookie_t cookie;
|
|
|
|
CALLB_CPR_INIT(&cpr, &l2arc_feed_thr_lock, callb_generic_cpr, FTAG);
|
|
|
|
mutex_enter(&l2arc_feed_thr_lock);
|
|
|
|
cookie = spl_fstrans_mark();
|
|
while (l2arc_thread_exit == 0) {
|
|
CALLB_CPR_SAFE_BEGIN(&cpr);
|
|
(void) cv_timedwait_sig(&l2arc_feed_thr_cv,
|
|
&l2arc_feed_thr_lock, next);
|
|
CALLB_CPR_SAFE_END(&cpr, &l2arc_feed_thr_lock);
|
|
next = ddi_get_lbolt() + hz;
|
|
|
|
/*
|
|
* Quick check for L2ARC devices.
|
|
*/
|
|
mutex_enter(&l2arc_dev_mtx);
|
|
if (l2arc_ndev == 0) {
|
|
mutex_exit(&l2arc_dev_mtx);
|
|
continue;
|
|
}
|
|
mutex_exit(&l2arc_dev_mtx);
|
|
begin = ddi_get_lbolt();
|
|
|
|
/*
|
|
* This selects the next l2arc device to write to, and in
|
|
* doing so the next spa to feed from: dev->l2ad_spa. This
|
|
* will return NULL if there are now no l2arc devices or if
|
|
* they are all faulted.
|
|
*
|
|
* If a device is returned, its spa's config lock is also
|
|
* held to prevent device removal. l2arc_dev_get_next()
|
|
* will grab and release l2arc_dev_mtx.
|
|
*/
|
|
if ((dev = l2arc_dev_get_next()) == NULL)
|
|
continue;
|
|
|
|
spa = dev->l2ad_spa;
|
|
ASSERT3P(spa, !=, NULL);
|
|
|
|
/*
|
|
* If the pool is read-only then force the feed thread to
|
|
* sleep a little longer.
|
|
*/
|
|
if (!spa_writeable(spa)) {
|
|
next = ddi_get_lbolt() + 5 * l2arc_feed_secs * hz;
|
|
spa_config_exit(spa, SCL_L2ARC, dev);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Avoid contributing to memory pressure.
|
|
*/
|
|
if (arc_reclaim_needed()) {
|
|
ARCSTAT_BUMP(arcstat_l2_abort_lowmem);
|
|
spa_config_exit(spa, SCL_L2ARC, dev);
|
|
continue;
|
|
}
|
|
|
|
ARCSTAT_BUMP(arcstat_l2_feeds);
|
|
|
|
size = l2arc_write_size();
|
|
|
|
/*
|
|
* Evict L2ARC buffers that will be overwritten.
|
|
*/
|
|
l2arc_evict(dev, size, B_FALSE);
|
|
|
|
/*
|
|
* Write ARC buffers.
|
|
*/
|
|
wrote = l2arc_write_buffers(spa, dev, size);
|
|
|
|
/*
|
|
* Calculate interval between writes.
|
|
*/
|
|
next = l2arc_write_interval(begin, size, wrote);
|
|
spa_config_exit(spa, SCL_L2ARC, dev);
|
|
}
|
|
spl_fstrans_unmark(cookie);
|
|
|
|
l2arc_thread_exit = 0;
|
|
cv_broadcast(&l2arc_feed_thr_cv);
|
|
CALLB_CPR_EXIT(&cpr); /* drops l2arc_feed_thr_lock */
|
|
thread_exit();
|
|
}
|
|
|
|
boolean_t
|
|
l2arc_vdev_present(vdev_t *vd)
|
|
{
|
|
l2arc_dev_t *dev;
|
|
|
|
mutex_enter(&l2arc_dev_mtx);
|
|
for (dev = list_head(l2arc_dev_list); dev != NULL;
|
|
dev = list_next(l2arc_dev_list, dev)) {
|
|
if (dev->l2ad_vdev == vd)
|
|
break;
|
|
}
|
|
mutex_exit(&l2arc_dev_mtx);
|
|
|
|
return (dev != NULL);
|
|
}
|
|
|
|
/*
|
|
* Add a vdev for use by the L2ARC. By this point the spa has already
|
|
* validated the vdev and opened it.
|
|
*/
|
|
void
|
|
l2arc_add_vdev(spa_t *spa, vdev_t *vd)
|
|
{
|
|
l2arc_dev_t *adddev;
|
|
|
|
ASSERT(!l2arc_vdev_present(vd));
|
|
|
|
/*
|
|
* Create a new l2arc device entry.
|
|
*/
|
|
adddev = kmem_zalloc(sizeof (l2arc_dev_t), KM_SLEEP);
|
|
adddev->l2ad_spa = spa;
|
|
adddev->l2ad_vdev = vd;
|
|
adddev->l2ad_start = VDEV_LABEL_START_SIZE;
|
|
adddev->l2ad_end = VDEV_LABEL_START_SIZE + vdev_get_min_asize(vd);
|
|
adddev->l2ad_hand = adddev->l2ad_start;
|
|
adddev->l2ad_first = B_TRUE;
|
|
adddev->l2ad_writing = B_FALSE;
|
|
list_link_init(&adddev->l2ad_node);
|
|
|
|
mutex_init(&adddev->l2ad_mtx, NULL, MUTEX_DEFAULT, NULL);
|
|
/*
|
|
* This is a list of all ARC buffers that are still valid on the
|
|
* device.
|
|
*/
|
|
list_create(&adddev->l2ad_buflist, sizeof (arc_buf_hdr_t),
|
|
offsetof(arc_buf_hdr_t, b_l2hdr.b_l2node));
|
|
|
|
vdev_space_update(vd, 0, 0, adddev->l2ad_end - adddev->l2ad_hand);
|
|
refcount_create(&adddev->l2ad_alloc);
|
|
|
|
/*
|
|
* Add device to global list
|
|
*/
|
|
mutex_enter(&l2arc_dev_mtx);
|
|
list_insert_head(l2arc_dev_list, adddev);
|
|
atomic_inc_64(&l2arc_ndev);
|
|
mutex_exit(&l2arc_dev_mtx);
|
|
}
|
|
|
|
/*
|
|
* Remove a vdev from the L2ARC.
|
|
*/
|
|
void
|
|
l2arc_remove_vdev(vdev_t *vd)
|
|
{
|
|
l2arc_dev_t *dev, *nextdev, *remdev = NULL;
|
|
|
|
/*
|
|
* Find the device by vdev
|
|
*/
|
|
mutex_enter(&l2arc_dev_mtx);
|
|
for (dev = list_head(l2arc_dev_list); dev; dev = nextdev) {
|
|
nextdev = list_next(l2arc_dev_list, dev);
|
|
if (vd == dev->l2ad_vdev) {
|
|
remdev = dev;
|
|
break;
|
|
}
|
|
}
|
|
ASSERT3P(remdev, !=, NULL);
|
|
|
|
/*
|
|
* Remove device from global list
|
|
*/
|
|
list_remove(l2arc_dev_list, remdev);
|
|
l2arc_dev_last = NULL; /* may have been invalidated */
|
|
atomic_dec_64(&l2arc_ndev);
|
|
mutex_exit(&l2arc_dev_mtx);
|
|
|
|
/*
|
|
* Clear all buflists and ARC references. L2ARC device flush.
|
|
*/
|
|
l2arc_evict(remdev, 0, B_TRUE);
|
|
list_destroy(&remdev->l2ad_buflist);
|
|
mutex_destroy(&remdev->l2ad_mtx);
|
|
refcount_destroy(&remdev->l2ad_alloc);
|
|
kmem_free(remdev, sizeof (l2arc_dev_t));
|
|
}
|
|
|
|
void
|
|
l2arc_init(void)
|
|
{
|
|
l2arc_thread_exit = 0;
|
|
l2arc_ndev = 0;
|
|
l2arc_writes_sent = 0;
|
|
l2arc_writes_done = 0;
|
|
|
|
mutex_init(&l2arc_feed_thr_lock, NULL, MUTEX_DEFAULT, NULL);
|
|
cv_init(&l2arc_feed_thr_cv, NULL, CV_DEFAULT, NULL);
|
|
mutex_init(&l2arc_dev_mtx, NULL, MUTEX_DEFAULT, NULL);
|
|
mutex_init(&l2arc_free_on_write_mtx, NULL, MUTEX_DEFAULT, NULL);
|
|
|
|
l2arc_dev_list = &L2ARC_dev_list;
|
|
l2arc_free_on_write = &L2ARC_free_on_write;
|
|
list_create(l2arc_dev_list, sizeof (l2arc_dev_t),
|
|
offsetof(l2arc_dev_t, l2ad_node));
|
|
list_create(l2arc_free_on_write, sizeof (l2arc_data_free_t),
|
|
offsetof(l2arc_data_free_t, l2df_list_node));
|
|
}
|
|
|
|
void
|
|
l2arc_fini(void)
|
|
{
|
|
/*
|
|
* This is called from dmu_fini(), which is called from spa_fini();
|
|
* Because of this, we can assume that all l2arc devices have
|
|
* already been removed when the pools themselves were removed.
|
|
*/
|
|
|
|
l2arc_do_free_on_write();
|
|
|
|
mutex_destroy(&l2arc_feed_thr_lock);
|
|
cv_destroy(&l2arc_feed_thr_cv);
|
|
mutex_destroy(&l2arc_dev_mtx);
|
|
mutex_destroy(&l2arc_free_on_write_mtx);
|
|
|
|
list_destroy(l2arc_dev_list);
|
|
list_destroy(l2arc_free_on_write);
|
|
}
|
|
|
|
void
|
|
l2arc_start(void)
|
|
{
|
|
if (!(spa_mode_global & FWRITE))
|
|
return;
|
|
|
|
(void) thread_create(NULL, 0, l2arc_feed_thread, NULL, 0, &p0,
|
|
TS_RUN, defclsyspri);
|
|
}
|
|
|
|
void
|
|
l2arc_stop(void)
|
|
{
|
|
if (!(spa_mode_global & FWRITE))
|
|
return;
|
|
|
|
mutex_enter(&l2arc_feed_thr_lock);
|
|
cv_signal(&l2arc_feed_thr_cv); /* kick thread out of startup */
|
|
l2arc_thread_exit = 1;
|
|
while (l2arc_thread_exit != 0)
|
|
cv_wait(&l2arc_feed_thr_cv, &l2arc_feed_thr_lock);
|
|
mutex_exit(&l2arc_feed_thr_lock);
|
|
}
|
|
|
|
#if defined(_KERNEL) && defined(HAVE_SPL)
|
|
EXPORT_SYMBOL(arc_buf_size);
|
|
EXPORT_SYMBOL(arc_write);
|
|
EXPORT_SYMBOL(arc_read);
|
|
EXPORT_SYMBOL(arc_buf_info);
|
|
EXPORT_SYMBOL(arc_getbuf_func);
|
|
EXPORT_SYMBOL(arc_add_prune_callback);
|
|
EXPORT_SYMBOL(arc_remove_prune_callback);
|
|
|
|
/* BEGIN CSTYLED */
|
|
module_param(zfs_arc_min, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_min, "Min arc size");
|
|
|
|
module_param(zfs_arc_max, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_max, "Max arc size");
|
|
|
|
module_param(zfs_arc_meta_limit, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_meta_limit, "Meta limit for arc size");
|
|
|
|
module_param(zfs_arc_meta_limit_percent, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_meta_limit_percent,
|
|
"Percent of arc size for arc meta limit");
|
|
|
|
module_param(zfs_arc_meta_min, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_meta_min, "Min arc metadata");
|
|
|
|
module_param(zfs_arc_meta_prune, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_meta_prune, "Meta objects to scan for prune");
|
|
|
|
module_param(zfs_arc_meta_adjust_restarts, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_meta_adjust_restarts,
|
|
"Limit number of restarts in arc_adjust_meta");
|
|
|
|
module_param(zfs_arc_meta_strategy, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_meta_strategy, "Meta reclaim strategy");
|
|
|
|
module_param(zfs_arc_grow_retry, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_grow_retry, "Seconds before growing arc size");
|
|
|
|
module_param(zfs_arc_p_aggressive_disable, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_p_aggressive_disable, "disable aggressive arc_p grow");
|
|
|
|
module_param(zfs_arc_p_dampener_disable, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_p_dampener_disable, "disable arc_p adapt dampener");
|
|
|
|
module_param(zfs_arc_shrink_shift, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_shrink_shift, "log2(fraction of arc to reclaim)");
|
|
|
|
module_param(zfs_arc_pc_percent, uint, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_pc_percent,
|
|
"Percent of pagecache to reclaim arc to");
|
|
|
|
module_param(zfs_arc_p_min_shift, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_p_min_shift, "arc_c shift to calc min/max arc_p");
|
|
|
|
module_param(zfs_arc_average_blocksize, int, 0444);
|
|
MODULE_PARM_DESC(zfs_arc_average_blocksize, "Target average block size");
|
|
|
|
module_param(zfs_compressed_arc_enabled, int, 0644);
|
|
MODULE_PARM_DESC(zfs_compressed_arc_enabled, "Disable compressed arc buffers");
|
|
|
|
module_param(zfs_arc_min_prefetch_lifespan, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_min_prefetch_lifespan, "Min life of prefetch block");
|
|
|
|
module_param(l2arc_write_max, ulong, 0644);
|
|
MODULE_PARM_DESC(l2arc_write_max, "Max write bytes per interval");
|
|
|
|
module_param(l2arc_write_boost, ulong, 0644);
|
|
MODULE_PARM_DESC(l2arc_write_boost, "Extra write bytes during device warmup");
|
|
|
|
module_param(l2arc_headroom, ulong, 0644);
|
|
MODULE_PARM_DESC(l2arc_headroom, "Number of max device writes to precache");
|
|
|
|
module_param(l2arc_headroom_boost, ulong, 0644);
|
|
MODULE_PARM_DESC(l2arc_headroom_boost, "Compressed l2arc_headroom multiplier");
|
|
|
|
module_param(l2arc_feed_secs, ulong, 0644);
|
|
MODULE_PARM_DESC(l2arc_feed_secs, "Seconds between L2ARC writing");
|
|
|
|
module_param(l2arc_feed_min_ms, ulong, 0644);
|
|
MODULE_PARM_DESC(l2arc_feed_min_ms, "Min feed interval in milliseconds");
|
|
|
|
module_param(l2arc_noprefetch, int, 0644);
|
|
MODULE_PARM_DESC(l2arc_noprefetch, "Skip caching prefetched buffers");
|
|
|
|
module_param(l2arc_feed_again, int, 0644);
|
|
MODULE_PARM_DESC(l2arc_feed_again, "Turbo L2ARC warmup");
|
|
|
|
module_param(l2arc_norw, int, 0644);
|
|
MODULE_PARM_DESC(l2arc_norw, "No reads during writes");
|
|
|
|
module_param(zfs_arc_lotsfree_percent, int, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_lotsfree_percent,
|
|
"System free memory I/O throttle in bytes");
|
|
|
|
module_param(zfs_arc_sys_free, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_sys_free, "System free memory target size in bytes");
|
|
|
|
module_param(zfs_arc_dnode_limit, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_dnode_limit, "Minimum bytes of dnodes in arc");
|
|
|
|
module_param(zfs_arc_dnode_limit_percent, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_dnode_limit_percent,
|
|
"Percent of ARC meta buffers for dnodes");
|
|
|
|
module_param(zfs_arc_dnode_reduce_percent, ulong, 0644);
|
|
MODULE_PARM_DESC(zfs_arc_dnode_reduce_percent,
|
|
"Percentage of excess dnodes to try to unpin");
|
|
/* END CSTYLED */
|
|
#endif
|