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Fix and disable blocks statistics during scrub

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Block statistics calculation during scrub I/O issue in case of sorted
scrub accounted ditto blocks several times.  Embedded blocks on other
side were not accounted at all.  This change moves the accounting from
issue to scan stage, that fixes both problems and also allows to avoid
pool-wide locking and the lock contention it created.

Since this statistics is quite specific and is not even exposed now
anywhere, disable its calculation by default to not waste CPU time.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #13579
This commit is contained in:
Alexander Motin
2022-06-28 14:23:31 -04:00
committed by Brian Behlendorf
parent 5e06805d8e
commit 4b8f16072d
3 changed files with 30 additions and 34 deletions
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include/sys/dsl_pool.h
-1
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@@ -82,7 +82,6 @@ typedef struct zfs_blkstat {
typedef struct zfs_all_blkstats {
zfs_blkstat_t zab_type[DN_MAX_LEVELS + 1][DMU_OT_TOTAL + 1];
kmutex_t zab_lock;
} zfs_all_blkstats_t;