Author: emax
Date: Wed May 23 18:56:29 2012
New Revision: 235854
URL: http://svn.freebsd.org/changeset/base/235854
Log:
Tweak condition for disabling allocation from per-CPU buckets in
low memory situation. I've observed a situation where per-CPU
allocations were disabled while there were enough free cached pages.
Basically, cnt.v_free_count was sitting stable at a value lower
than cnt.v_free_min and that caused massive performance drop.
Reviewed by: alc
MFC after: 1 week
Modified:
head/sys/vm/uma_core.c
Modified: head/sys/vm/uma_core.c
==============================================================================
--- head/sys/vm/uma_core.c Wed May 23 18:41:45 2012 (r235853)
+++ head/sys/vm/uma_core.c Wed May 23 18:56:29 2012 (r235854)
@@ -272,10 +272,7 @@ SYSCTL_PROC(_vm, OID_AUTO, zone_stats, C
static void
bucket_enable(void)
{
- if (cnt.v_free_count < cnt.v_free_min)
- bucketdisable = 1;
- else
- bucketdisable = 0;
+ bucketdisable = vm_page_count_min();
}
/*
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