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uma: whack main zone counter update in the slow path

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Cached counters are typically zero at this point so it performs
avoidable atomics. Everything reading them also reads the cached
ones, thus there is really no point.

Reviewed by:		jeff
This commit is contained in:
Mateusz Guzik 2018-04-27 05:37:35 +00:00
parent 23e17f83f1
commit e825ab8d89
1 changed files with 0 additions and 8 deletions
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8
sys/vm/uma_core.c
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@ -2329,14 +2329,6 @@ zalloc_start:
cpu = curcpu;
cache = &zone->uz_cpu[cpu];
/*
* Since we have locked the zone we may as well send back our stats.
*/
atomic_add_long(&zone->uz_allocs, cache->uc_allocs);
atomic_add_long(&zone->uz_frees, cache->uc_frees);
cache->uc_allocs = 0;
cache->uc_frees = 0;
/* See if we lost the race to fill the cache. */
if (cache->uc_allocbucket != NULL) {
ZONE_UNLOCK(zone);