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When purging per-CPU UMA caches do not return empty buckets into the global

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full bucket cache to not trigger assertion if allocation happen before that
global cache get purged.
This commit is contained in:
Alexander Motin 2013-11-23 13:42:56 +00:00
parent 680a6bcf2f
commit 8a8d9d1475
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=258497
1 changed files with 16 additions and 4 deletions
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20
sys/vm/uma_core.c
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@ -701,25 +701,37 @@ static void
cache_drain_safe_cpu(uma_zone_t zone)
{
uma_cache_t cache;
uma_bucket_t b1, b2;
if (zone->uz_flags & UMA_ZFLAG_INTERNAL)
return;
b1 = b2 = NULL;
ZONE_LOCK(zone);
critical_enter();
cache = &zone->uz_cpu[curcpu];
if (cache->uc_allocbucket) {
LIST_INSERT_HEAD(&zone->uz_buckets, cache->uc_allocbucket,
ub_link);
if (cache->uc_allocbucket->ub_cnt != 0)
LIST_INSERT_HEAD(&zone->uz_buckets,
cache->uc_allocbucket, ub_link);
else
b1 = cache->uc_allocbucket;
cache->uc_allocbucket = NULL;
}
if (cache->uc_freebucket) {
LIST_INSERT_HEAD(&zone->uz_buckets, cache->uc_freebucket,
ub_link);
if (cache->uc_freebucket->ub_cnt != 0)
LIST_INSERT_HEAD(&zone->uz_buckets,
cache->uc_freebucket, ub_link);
else
b2 = cache->uc_freebucket;
cache->uc_freebucket = NULL;
}
critical_exit();
ZONE_UNLOCK(zone);
if (b1)
bucket_free(zone, b1, NULL);
if (b2)
bucket_free(zone, b2, NULL);
}
/*