Author: emax
Date: Wed Jun 6 16:20:59 2012
New Revision: 236685
URL: http://svn.freebsd.org/changeset/base/236685
Log:
MFC r235854
Seems applicable here as well.
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
Requested by: Andrew Boyer aboyer at averesystems dot com
Modified:
stable/8/sys/vm/uma_core.c
Directory Properties:
stable/8/sys/ (props changed)
Modified: stable/8/sys/vm/uma_core.c
==============================================================================
--- stable/8/sys/vm/uma_core.c Wed Jun 6 16:01:45 2012 (r236684)
+++ stable/8/sys/vm/uma_core.c Wed Jun 6 16:20:59 2012 (r236685)
@@ -267,10 +267,7 @@ 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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