Date: Sat, 2 Jun 2012 19:21:35 +0000 (UTC) From: Andriy Gapon <avg@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: r236485 - stable/8/sys/vm Message-ID: <201206021921.q52JLZCn009041@svn.freebsd.org>
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Author: avg Date: Sat Jun 2 19:21:34 2012 New Revision: 236485 URL: http://svn.freebsd.org/changeset/base/236485 Log: MFC r235829: vm_pager_object_lookup: small performance optimization Modified: stable/8/sys/vm/vm_pager.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/boot/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) stable/8/sys/dev/e1000/ (props changed) Modified: stable/8/sys/vm/vm_pager.c ============================================================================== --- stable/8/sys/vm/vm_pager.c Sat Jun 2 19:16:09 2012 (r236484) +++ stable/8/sys/vm/vm_pager.c Sat Jun 2 19:21:34 2012 (r236485) @@ -272,14 +272,15 @@ vm_pager_object_lookup(struct pagerlst * vm_object_t object; TAILQ_FOREACH(object, pg_list, pager_object_list) { - VM_OBJECT_LOCK(object); - if (object->handle == handle && - (object->flags & OBJ_DEAD) == 0) { - vm_object_reference_locked(object); + if (object->handle == handle) { + VM_OBJECT_LOCK(object); + if ((object->flags & OBJ_DEAD) == 0) { + vm_object_reference_locked(object); + VM_OBJECT_UNLOCK(object); + break; + } VM_OBJECT_UNLOCK(object); - break; } - VM_OBJECT_UNLOCK(object); } return (object); }
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