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Ignore slab cache age and delay in direct reclaim

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When memory pressure triggers direct memory reclaim, a slabs age
and delay should not prevent it from being freed. This patch ensures
these values are ignored, allowing an empty slab to be freed in this
code path no matter the value of its age and delay.

This prevents needless scanning of the partial slabs and has been
observed to significantly reduce the total cpu usage.  In addition,
it should allow for snappier reclaim under memory pressure.

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #102
This commit is contained in:
Prakash Surya 2012-04-27 12:43:49 -07:00 committed by Brian Behlendorf
parent cef7605c34
commit c0e0fc14e3
1 changed files with 2 additions and 1 deletions
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3
module/spl/spl-kmem.c
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@ -1916,7 +1916,8 @@ spl_kmem_cache_reap_now(spl_kmem_cache_t *skc, int count)
if (skc->skc_reclaim) if (skc->skc_reclaim)
skc->skc_reclaim(skc->skc_private); skc->skc_reclaim(skc->skc_private);
spl_slab_reclaim(skc, count, 0); /* Reclaim from the cache, ignoring it's age and delay. */
spl_slab_reclaim(skc, count, 1);
clear_bit(KMC_BIT_REAPING, &skc->skc_flags); clear_bit(KMC_BIT_REAPING, &skc->skc_flags);
atomic_dec(&skc->skc_ref); atomic_dec(&skc->skc_ref);