69de34219a
Commit 49ddb31506 added the
zfs_arc_average_blocksize parameter to allow control over the size of
the arc hash table. The dbuf hash table's size should be determined
similarly.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3721
245 lines
7.4 KiB
C
245 lines
7.4 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, 2014 by Delphix. All rights reserved.
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* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
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*/
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#ifndef _SYS_ARC_H
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#define _SYS_ARC_H
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/zio.h>
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#include <sys/dmu.h>
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#include <sys/spa.h>
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#include <sys/refcount.h>
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/*
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* Used by arc_flush() to inform arc_evict_state() that it should evict
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* all available buffers from the arc state being passed in.
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*/
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#define ARC_EVICT_ALL -1ULL
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typedef struct arc_buf_hdr arc_buf_hdr_t;
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typedef struct arc_buf arc_buf_t;
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typedef struct arc_prune arc_prune_t;
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typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
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typedef void arc_prune_func_t(int64_t bytes, void *private);
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typedef int arc_evict_func_t(void *private);
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/* Shared module parameters */
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extern int zfs_arc_average_blocksize;
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/* generic arc_done_func_t's which you can use */
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arc_done_func_t arc_bcopy_func;
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arc_done_func_t arc_getbuf_func;
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/* generic arc_prune_func_t wrapper for callbacks */
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struct arc_prune {
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arc_prune_func_t *p_pfunc;
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void *p_private;
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uint64_t p_adjust;
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list_node_t p_node;
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refcount_t p_refcnt;
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};
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typedef enum arc_strategy {
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ARC_STRATEGY_META_ONLY = 0, /* Evict only meta data buffers */
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ARC_STRATEGY_META_BALANCED = 1, /* Evict data buffers if needed */
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} arc_strategy_t;
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typedef enum arc_flags
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{
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/*
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* Public flags that can be passed into the ARC by external consumers.
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*/
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ARC_FLAG_NONE = 1 << 0, /* No flags set */
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ARC_FLAG_WAIT = 1 << 1, /* perform sync I/O */
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ARC_FLAG_NOWAIT = 1 << 2, /* perform async I/O */
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ARC_FLAG_PREFETCH = 1 << 3, /* I/O is a prefetch */
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ARC_FLAG_CACHED = 1 << 4, /* I/O was in cache */
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ARC_FLAG_L2CACHE = 1 << 5, /* cache in L2ARC */
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ARC_FLAG_L2COMPRESS = 1 << 6, /* compress in L2ARC */
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/*
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* Private ARC flags. These flags are private ARC only flags that
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* will show up in b_flags in the arc_hdr_buf_t. These flags should
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* only be set by ARC code.
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*/
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ARC_FLAG_IN_HASH_TABLE = 1 << 7, /* buffer is hashed */
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ARC_FLAG_IO_IN_PROGRESS = 1 << 8, /* I/O in progress */
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ARC_FLAG_IO_ERROR = 1 << 9, /* I/O failed for buf */
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ARC_FLAG_FREED_IN_READ = 1 << 10, /* freed during read */
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ARC_FLAG_BUF_AVAILABLE = 1 << 11, /* block not in use */
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ARC_FLAG_INDIRECT = 1 << 12, /* indirect block */
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ARC_FLAG_L2_WRITING = 1 << 13, /* write in progress */
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ARC_FLAG_L2_EVICTED = 1 << 14, /* evicted during I/O */
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ARC_FLAG_L2_WRITE_HEAD = 1 << 15, /* head of write list */
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/* indicates that the buffer contains metadata (otherwise, data) */
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ARC_FLAG_BUFC_METADATA = 1 << 16,
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/* Flags specifying whether optional hdr struct fields are defined */
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ARC_FLAG_HAS_L1HDR = 1 << 17,
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ARC_FLAG_HAS_L2HDR = 1 << 18,
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/*
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* The arc buffer's compression mode is stored in the top 7 bits of the
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* flags field, so these dummy flags are included so that MDB can
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* interpret the enum properly.
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*/
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ARC_FLAG_COMPRESS_0 = 1 << 24,
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ARC_FLAG_COMPRESS_1 = 1 << 25,
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ARC_FLAG_COMPRESS_2 = 1 << 26,
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ARC_FLAG_COMPRESS_3 = 1 << 27,
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ARC_FLAG_COMPRESS_4 = 1 << 28,
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ARC_FLAG_COMPRESS_5 = 1 << 29,
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ARC_FLAG_COMPRESS_6 = 1 << 30
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} arc_flags_t;
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struct arc_buf {
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arc_buf_hdr_t *b_hdr;
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arc_buf_t *b_next;
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kmutex_t b_evict_lock;
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void *b_data;
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arc_evict_func_t *b_efunc;
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void *b_private;
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};
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typedef enum arc_buf_contents {
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ARC_BUFC_DATA, /* buffer contains data */
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ARC_BUFC_METADATA, /* buffer contains metadata */
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ARC_BUFC_NUMTYPES
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} arc_buf_contents_t;
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/*
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* The following breakdows of arc_size exist for kstat only.
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*/
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typedef enum arc_space_type {
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ARC_SPACE_DATA,
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ARC_SPACE_META,
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ARC_SPACE_HDRS,
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ARC_SPACE_L2HDRS,
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ARC_SPACE_OTHER,
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ARC_SPACE_NUMTYPES
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} arc_space_type_t;
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typedef enum arc_state_type {
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ARC_STATE_ANON,
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ARC_STATE_MRU,
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ARC_STATE_MRU_GHOST,
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ARC_STATE_MFU,
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ARC_STATE_MFU_GHOST,
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ARC_STATE_L2C_ONLY,
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ARC_STATE_NUMTYPES
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} arc_state_type_t;
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typedef struct arc_buf_info {
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arc_state_type_t abi_state_type;
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arc_buf_contents_t abi_state_contents;
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uint32_t abi_flags;
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uint32_t abi_datacnt;
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uint64_t abi_size;
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uint64_t abi_spa;
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uint64_t abi_access;
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uint32_t abi_mru_hits;
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uint32_t abi_mru_ghost_hits;
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uint32_t abi_mfu_hits;
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uint32_t abi_mfu_ghost_hits;
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uint32_t abi_l2arc_hits;
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uint32_t abi_holds;
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uint64_t abi_l2arc_dattr;
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uint64_t abi_l2arc_asize;
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enum zio_compress abi_l2arc_compress;
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} arc_buf_info_t;
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void arc_space_consume(uint64_t space, arc_space_type_t type);
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void arc_space_return(uint64_t space, arc_space_type_t type);
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arc_buf_t *arc_buf_alloc(spa_t *spa, uint64_t size, void *tag,
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arc_buf_contents_t type);
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arc_buf_t *arc_loan_buf(spa_t *spa, uint64_t size);
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void arc_return_buf(arc_buf_t *buf, void *tag);
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void arc_loan_inuse_buf(arc_buf_t *buf, void *tag);
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void arc_buf_add_ref(arc_buf_t *buf, void *tag);
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boolean_t arc_buf_remove_ref(arc_buf_t *buf, void *tag);
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void arc_buf_info(arc_buf_t *buf, arc_buf_info_t *abi, int state_index);
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uint64_t arc_buf_size(arc_buf_t *buf);
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void arc_release(arc_buf_t *buf, void *tag);
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int arc_released(arc_buf_t *buf);
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void arc_buf_sigsegv(int sig, siginfo_t *si, void *unused);
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void arc_buf_freeze(arc_buf_t *buf);
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void arc_buf_thaw(arc_buf_t *buf);
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boolean_t arc_buf_eviction_needed(arc_buf_t *buf);
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#ifdef ZFS_DEBUG
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int arc_referenced(arc_buf_t *buf);
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#endif
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int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
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arc_done_func_t *done, void *private, zio_priority_t priority, int flags,
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arc_flags_t *arc_flags, const zbookmark_phys_t *zb);
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zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
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blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, boolean_t l2arc_compress,
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const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *physdone,
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arc_done_func_t *done, void *private, zio_priority_t priority,
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int zio_flags, const zbookmark_phys_t *zb);
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arc_prune_t *arc_add_prune_callback(arc_prune_func_t *func, void *private);
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void arc_remove_prune_callback(arc_prune_t *p);
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void arc_freed(spa_t *spa, const blkptr_t *bp);
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void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
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boolean_t arc_clear_callback(arc_buf_t *buf);
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void arc_flush(spa_t *spa, boolean_t retry);
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void arc_tempreserve_clear(uint64_t reserve);
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int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
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void arc_init(void);
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void arc_fini(void);
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/*
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* Level 2 ARC
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*/
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void l2arc_add_vdev(spa_t *spa, vdev_t *vd);
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void l2arc_remove_vdev(vdev_t *vd);
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boolean_t l2arc_vdev_present(vdev_t *vd);
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void l2arc_init(void);
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void l2arc_fini(void);
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void l2arc_start(void);
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void l2arc_stop(void);
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#ifndef _KERNEL
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extern boolean_t arc_watch;
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_ARC_H */
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