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Stop double reclaiming or not reclaiming at all

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Move arcstat_need_free increment from all direct calls to when
arc_reclaim_lock is busy and we exit wihout doing anything. Data will
be reclaimed in reclaim thread. The previous location meant that we
both reclaim the memory in this thread, and also schedule the same
amount of memory for reclaim in arc_reclaim, effectively doubling the
requested reclaim.

AKAMAI: zfs: CR 3695072
Reviewed-by: Tim Chase <tim@chase2k.com>
Reviewed-by: Richard Yao <ryao@gentoo.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Debabrata Banerjee <dbanerje@akamai.com>
Issue #6035
This commit is contained in:
Debabrata Banerjee 2017-03-15 18:46:46 -04:00 committed by Brian Behlendorf
parent 30fffb9021
commit b855550c33
1 changed files with 3 additions and 2 deletions
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5
module/zfs/arc.c
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@ -4414,8 +4414,10 @@ __arc_shrinker_func(struct shrinker *shrink, struct shrink_control *sc)
return (SHRINK_STOP);
/* Reclaim in progress */
if (mutex_tryenter(&arc_reclaim_lock) == 0)
if (mutex_tryenter(&arc_reclaim_lock) == 0) {
ARCSTAT_INCR(arcstat_need_free, ptob(sc->nr_to_scan));
return (SHRINK_STOP);
}
mutex_exit(&arc_reclaim_lock);
@ -4453,7 +4455,6 @@ __arc_shrinker_func(struct shrinker *shrink, struct shrink_control *sc)
ARCSTAT_BUMP(arcstat_memory_indirect_count);
} else {
arc_no_grow = B_TRUE;
ARCSTAT_INCR(arcstat_need_free, ptob(sc->nr_to_scan));
ARCSTAT_BUMP(arcstat_memory_direct_count);
}