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Fix/improve dbuf hits accounting

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Instead of clearing stats inside arc_buf_alloc_impl() do it inside
arc_hdr_alloc() and arc_release().  It fixes statistics being wiped
every time a new dbuf is filled from the ARC.

Remove b_l1hdr.b_l2_hits. L2ARC hits are accounted at b_l2hdr.b_hits.
Since the hits are accounted under hash lock, replace atomics with
simple increments.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Closes #12422
This commit is contained in:
Alexander Motin
2021-08-17 11:50:31 -04:00
committed by Tony Hutter
parent c600f0687f
commit 40e02f49e9
3 changed files with 16 additions and 28 deletions
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include/sys/arc_impl.h
+4 -6
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@@ -153,24 +153,22 @@ typedef struct l1arc_buf_hdr {
kmutex_t b_freeze_lock;
zio_cksum_t *b_freeze_cksum;
arc_buf_t *b_buf;
uint32_t b_bufcnt;
/* for waiting on writes to complete */
/* for waiting on reads to complete */
kcondvar_t b_cv;
uint8_t b_byteswap;
/* protected by arc state mutex */
arc_state_t *b_state;
multilist_node_t b_arc_node;
/* updated atomically */
/* protected by hash lock */
clock_t b_arc_access;
uint32_t b_mru_hits;
uint32_t b_mru_ghost_hits;
uint32_t b_mfu_hits;
uint32_t b_mfu_ghost_hits;
uint32_t b_l2_hits;
uint32_t b_bufcnt;
arc_buf_t *b_buf;
/* self protecting */
zfs_refcount_t b_refcnt;