Date: Wed, 23 May 2012 18:56:29 +0000 (UTC) From: Maksim Yevmenkin <emax@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r235854 - head/sys/vm Message-ID: <201205231856.q4NIuTBC089911@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
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(); } /*
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201205231856.q4NIuTBC089911>