e0b0ca983d
Currently there is no mechanism to inspect which dbufs are being cached by the system. There are some coarse counters in arcstats by they only give a rough idea of what's being cached. This patch aims to improve the current situation by adding a new dbufs kstat. When read this new kstat will walk all cached dbufs linked in to the dbuf_hash. For each dbuf it will dump detailed information about the buffer. It will also dump additional information about the referenced arc buffer and its related dnode. This provides a more complete view in to exactly what is being cached. With this generic infrastructure in place utilities can be written to post-process the data to understand exactly how the caching is working. For example, the data could be processed to show a list of all cached dnodes and how much space they're consuming. Or a similar list could be generated based on dnode type. Many other ways to interpret the data exist based on what kinds of questions you're trying to answer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Prakash Surya <surya1@llnl.gov>
191 lines
5.6 KiB
C
191 lines
5.6 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) 2013 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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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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/* 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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list_node_t p_node;
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refcount_t p_refcnt;
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};
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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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* These are the flags we pass into calls to the arc
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*/
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#define ARC_WAIT (1 << 1) /* perform I/O synchronously */
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#define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */
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#define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */
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#define ARC_CACHED (1 << 4) /* I/O was already in cache */
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#define ARC_L2CACHE (1 << 5) /* cache in L2ARC */
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#define ARC_L2COMPRESS (1 << 6) /* compress in L2ARC */
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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_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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uint64_t abi_state_index;
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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, int 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, int 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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int 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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int arc_has_callback(arc_buf_t *buf);
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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, int priority, int flags,
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uint32_t *arc_flags, const zbookmark_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 *done,
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void *private, int priority, int zio_flags, const zbookmark_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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int arc_buf_evict(arc_buf_t *buf);
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void arc_adjust_meta(int64_t adjustment, boolean_t may_prune);
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void arc_flush(spa_t *spa);
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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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/* Global tunings */
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extern int zfs_write_limit_shift;
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extern unsigned long zfs_write_limit_max;
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extern kmutex_t zfs_write_limit_lock;
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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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