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Allocating new bucket for bucket zone, never take it from the zone itself,

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since it will almost certanly fail.  Take next bigger zone instead.

This situation should not happen with original bucket zones configuration:
"32 Bucket" zone uses "64 Bucket" and vice versa.  But if "64 Bucket" zone
lock is congested, zone may grow its bucket size and start biting itself.

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
This commit is contained in:
mav 2014-06-12 11:36:22 +00:00
parent 618eff653b
commit c7987fc583
1 changed files with 2 additions and 0 deletions
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2
sys/vm/uma_core.c
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@ -381,6 +381,8 @@ bucket_alloc(uma_zone_t zone, void *udata, int flags)
if ((uintptr_t)udata & UMA_ZFLAG_CACHEONLY)
flags |= M_NOVM;
ubz = bucket_zone_lookup(zone->uz_count);
if (ubz->ubz_zone == zone && (ubz + 1)->ubz_entries != 0)
ubz++;
bucket = uma_zalloc_arg(ubz->ubz_zone, udata, flags);
if (bucket) {
#ifdef INVARIANTS