Author: kib
Date: Fri Dec 12 09:22:52 2014
New Revision: 275726
URL: https://svnweb.freebsd.org/changeset/base/275726
Log:
MFC r275513:
When the last reference on the vnode' vm object is dropped, read the
vp->v_vflag without taking vnode lock and without bypass.
Modified:
stable/10/sys/vm/vm_object.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/vm/vm_object.c
==============================================================================
--- stable/10/sys/vm/vm_object.c Fri Dec 12 08:00:56 2014
(r275725)
+++ stable/10/sys/vm/vm_object.c Fri Dec 12 09:22:52 2014
(r275726)
@@ -468,7 +468,12 @@ vm_object_vndeallocate(vm_object_t objec
}
#endif
- if (object->ref_count > 1) {
+ /*
+ * The test for text of vp vnode does not need a bypass to
+ * reach right VV_TEXT there, since it is obtained from
+ * object->handle.
+ */
+ if (object->ref_count > 1 || (vp->v_vflag & VV_TEXT) == 0) {
object->ref_count--;
VM_OBJECT_WUNLOCK(object);
/* vrele may need the vnode lock. */
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