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Use wmsum for arc, abd, dbuf and zfetch statistics.
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wmsum was designed exactly for cases like these with many updates
and rare reads.  It allows to completely avoid atomic operations on
congested global variables.

Signed-off-by: Alexander Motin <[email protected]>
Sponsored-By: iXsystems, Inc.
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@amotin
amotin committed Jun 11, 2021
1 parent 10bcc4d commit 9fe4ae4
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Showing 8 changed files with 778 additions and 216 deletions.
4 changes: 2 additions & 2 deletions include/sys/abd_impl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
#define _ABD_IMPL_H

#include <sys/abd.h>
#include <sys/wmsum.h>

#ifdef __cplusplus
extern "C" {
Expand Down Expand Up @@ -82,9 +83,8 @@ void abd_iter_unmap(struct abd_iter *);
/*
* Helper macros
*/
#define ABDSTAT(stat) (abd_stats.stat.value.ui64)
#define ABDSTAT_INCR(stat, val) \
atomic_add_64(&abd_stats.stat.value.ui64, (val))
wmsum_add(&abd_sums.stat, (val))
#define ABDSTAT_BUMP(stat) ABDSTAT_INCR(stat, 1)
#define ABDSTAT_BUMPDOWN(stat) ABDSTAT_INCR(stat, -1)

Expand Down
119 changes: 93 additions & 26 deletions include/sys/arc_impl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@
#include <sys/zio_crypt.h>
#include <sys/zthr.h>
#include <sys/aggsum.h>
#include <sys/wmsum.h>

#ifdef __cplusplus
extern "C" {
Expand Down Expand Up @@ -563,7 +564,6 @@ typedef struct arc_stats {
kstat_named_t arcstat_c;
kstat_named_t arcstat_c_min;
kstat_named_t arcstat_c_max;
/* Not updated directly; only synced in arc_kstat_update. */
kstat_named_t arcstat_size;
/*
* Number of compressed bytes stored in the arc_buf_hdr_t's b_pabd.
Expand Down Expand Up @@ -592,37 +592,31 @@ typedef struct arc_stats {
* (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).
* Not updated directly; only synced in arc_kstat_update.
*/
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).
* Not updated directly; only synced in arc_kstat_update.
*/
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).
* Not updated directly; only synced in arc_kstat_update.
*/
kstat_named_t arcstat_metadata_size;
/*
* Number of bytes consumed by dmu_buf_impl_t objects.
* Not updated directly; only synced in arc_kstat_update.
*/
kstat_named_t arcstat_dbuf_size;
/*
* Number of bytes consumed by dnode_t objects.
* Not updated directly; only synced in arc_kstat_update.
*/
kstat_named_t arcstat_dnode_size;
/*
* Number of bytes consumed by bonus buffers.
* Not updated directly; only synced in arc_kstat_update.
*/
kstat_named_t arcstat_bonus_size;
#if defined(COMPAT_FREEBSD11)
Expand All @@ -637,47 +631,41 @@ typedef struct arc_stats {
* 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.
* Not updated directly; only synced in arc_kstat_update.
*/
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).
* Not updated directly; only synced in arc_kstat_update.
*/
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).
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
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).
* Not updated directly; only synced in arc_kstat_update.
*/
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).
* Not updated directly; only synced in arc_kstat_update.
*/
kstat_named_t arcstat_mru_evictable_metadata;
/*
Expand All @@ -688,64 +676,55 @@ typedef struct arc_stats {
* 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.
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
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.
* Not updated directly; only synced in arc_kstat_update.
*/
kstat_named_t arcstat_mfu_ghost_evictable_metadata;
kstat_named_t arcstat_l2_hits;
Expand Down Expand Up @@ -779,7 +758,6 @@ typedef struct arc_stats {
kstat_named_t arcstat_l2_io_error;
kstat_named_t arcstat_l2_lsize;
kstat_named_t arcstat_l2_psize;
/* Not updated directly; only synced in arc_kstat_update. */
kstat_named_t arcstat_l2_hdr_size;
/*
* Number of L2ARC log blocks written. These are used for restoring the
Expand Down Expand Up @@ -860,7 +838,6 @@ typedef struct arc_stats {
kstat_named_t arcstat_tempreserve;
kstat_named_t arcstat_loaned_bytes;
kstat_named_t arcstat_prune;
/* Not updated directly; only synced in arc_kstat_update. */
kstat_named_t arcstat_meta_used;
kstat_named_t arcstat_meta_limit;
kstat_named_t arcstat_dnode_limit;
Expand All @@ -876,6 +853,96 @@ typedef struct arc_stats {
kstat_named_t arcstat_abd_chunk_waste_size;
} arc_stats_t;

typedef struct arc_sums {
wmsum_t arcstat_hits;
wmsum_t arcstat_misses;
wmsum_t arcstat_demand_data_hits;
wmsum_t arcstat_demand_data_misses;
wmsum_t arcstat_demand_metadata_hits;
wmsum_t arcstat_demand_metadata_misses;
wmsum_t arcstat_prefetch_data_hits;
wmsum_t arcstat_prefetch_data_misses;
wmsum_t arcstat_prefetch_metadata_hits;
wmsum_t arcstat_prefetch_metadata_misses;
wmsum_t arcstat_mru_hits;
wmsum_t arcstat_mru_ghost_hits;
wmsum_t arcstat_mfu_hits;
wmsum_t arcstat_mfu_ghost_hits;
wmsum_t arcstat_deleted;
wmsum_t arcstat_mutex_miss;
wmsum_t arcstat_access_skip;
wmsum_t arcstat_evict_skip;
wmsum_t arcstat_evict_not_enough;
wmsum_t arcstat_evict_l2_cached;
wmsum_t arcstat_evict_l2_eligible;
wmsum_t arcstat_evict_l2_eligible_mfu;
wmsum_t arcstat_evict_l2_eligible_mru;
wmsum_t arcstat_evict_l2_ineligible;
wmsum_t arcstat_evict_l2_skip;
wmsum_t arcstat_hash_collisions;
wmsum_t arcstat_hash_chains;
aggsum_t arcstat_size;
wmsum_t arcstat_compressed_size;
wmsum_t arcstat_uncompressed_size;
wmsum_t arcstat_overhead_size;
wmsum_t arcstat_hdr_size;
wmsum_t arcstat_data_size;
wmsum_t arcstat_metadata_size;
wmsum_t arcstat_dbuf_size;
aggsum_t arcstat_dnode_size;
wmsum_t arcstat_bonus_size;
wmsum_t arcstat_l2_hits;
wmsum_t arcstat_l2_misses;
wmsum_t arcstat_l2_prefetch_asize;
wmsum_t arcstat_l2_mru_asize;
wmsum_t arcstat_l2_mfu_asize;
wmsum_t arcstat_l2_bufc_data_asize;
wmsum_t arcstat_l2_bufc_metadata_asize;
wmsum_t arcstat_l2_feeds;
wmsum_t arcstat_l2_rw_clash;
wmsum_t arcstat_l2_read_bytes;
wmsum_t arcstat_l2_write_bytes;
wmsum_t arcstat_l2_writes_sent;
wmsum_t arcstat_l2_writes_done;
wmsum_t arcstat_l2_writes_error;
wmsum_t arcstat_l2_writes_lock_retry;
wmsum_t arcstat_l2_evict_lock_retry;
wmsum_t arcstat_l2_evict_reading;
wmsum_t arcstat_l2_evict_l1cached;
wmsum_t arcstat_l2_free_on_write;
wmsum_t arcstat_l2_abort_lowmem;
wmsum_t arcstat_l2_cksum_bad;
wmsum_t arcstat_l2_io_error;
wmsum_t arcstat_l2_lsize;
wmsum_t arcstat_l2_psize;
aggsum_t arcstat_l2_hdr_size;
wmsum_t arcstat_l2_log_blk_writes;
wmsum_t arcstat_l2_log_blk_asize;
wmsum_t arcstat_l2_log_blk_count;
wmsum_t arcstat_l2_rebuild_success;
wmsum_t arcstat_l2_rebuild_abort_unsupported;
wmsum_t arcstat_l2_rebuild_abort_io_errors;
wmsum_t arcstat_l2_rebuild_abort_dh_errors;
wmsum_t arcstat_l2_rebuild_abort_cksum_lb_errors;
wmsum_t arcstat_l2_rebuild_abort_lowmem;
wmsum_t arcstat_l2_rebuild_size;
wmsum_t arcstat_l2_rebuild_asize;
wmsum_t arcstat_l2_rebuild_bufs;
wmsum_t arcstat_l2_rebuild_bufs_precached;
wmsum_t arcstat_l2_rebuild_log_blks;
wmsum_t arcstat_memory_throttle_count;
wmsum_t arcstat_memory_direct_count;
wmsum_t arcstat_memory_indirect_count;
wmsum_t arcstat_prune;
aggsum_t arcstat_meta_used;
wmsum_t arcstat_async_upgrade_sync;
wmsum_t arcstat_demand_hit_predictive_prefetch;
wmsum_t arcstat_demand_hit_prescient_prefetch;
wmsum_t arcstat_raw_size;
wmsum_t arcstat_cached_only_in_progress;
wmsum_t arcstat_abd_chunk_waste_size;
} arc_sums_t;

typedef struct arc_evict_waiter {
list_node_t aew_node;
kcondvar_t aew_cv;
Expand All @@ -885,7 +952,7 @@ typedef struct arc_evict_waiter {
#define ARCSTAT(stat) (arc_stats.stat.value.ui64)

#define ARCSTAT_INCR(stat, val) \
atomic_add_64(&arc_stats.stat.value.ui64, (val))
wmsum_add(&arc_sums.stat, (val))

#define ARCSTAT_BUMP(stat) ARCSTAT_INCR(stat, 1)
#define ARCSTAT_BUMPDOWN(stat) ARCSTAT_INCR(stat, -1)
Expand All @@ -899,14 +966,14 @@ typedef struct arc_evict_waiter {

extern taskq_t *arc_prune_taskq;
extern arc_stats_t arc_stats;
extern arc_sums_t arc_sums;
extern hrtime_t arc_growtime;
extern boolean_t arc_warm;
extern int arc_grow_retry;
extern int arc_no_grow_shift;
extern int arc_shrink_shift;
extern kmutex_t arc_prune_mtx;
extern list_t arc_prune_list;
extern aggsum_t arc_size;
extern arc_state_t *arc_mfu;
extern arc_state_t *arc_mru;
extern uint_t zfs_arc_pc_percent;
Expand Down
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