Date: Wed, 6 Jun 2012 16:20:59 +0000 (UTC) From: Maksim Yevmenkin <emax@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r236685 - stable/8/sys/vm Message-ID: <201206061620.q56GKxr7024865@svn.freebsd.org>
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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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