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From: Andriy Gapon <avg@FreeBSD.org>
Date: Sat, 2 Jun 2012 19:21:35 +0000 (UTC)
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Subject: svn commit: r236485 - stable/8/sys/vm
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X-List-Received-Date: Sat, 02 Jun 2012 19:21:35 -0000
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);
}