Author: alc
Date: Tue Jun 4 17:23:09 2013
New Revision: 251391
URL: http://svnweb.freebsd.org/changeset/base/251391
Log:
Relax the vm object locking in mac_proc_vm_revoke_recurse(). A read lock
suffices in one place.
Sponsored by: EMC / Isilon Storage Division
Modified:
head/sys/security/mac/mac_process.c
Modified: head/sys/security/mac/mac_process.c
==============================================================================
--- head/sys/security/mac/mac_process.c Tue Jun 4 17:08:26 2013
(r251390)
+++ head/sys/security/mac/mac_process.c Tue Jun 4 17:23:09 2013
(r251391)
@@ -284,14 +284,14 @@ mac_proc_vm_revoke_recurse(struct thread
object = vme->object.vm_object;
if (object == NULL)
continue;
- VM_OBJECT_WLOCK(object);
+ VM_OBJECT_RLOCK(object);
while ((backing_object = object->backing_object) != NULL) {
- VM_OBJECT_WLOCK(backing_object);
+ VM_OBJECT_RLOCK(backing_object);
offset += object->backing_object_offset;
- VM_OBJECT_WUNLOCK(object);
+ VM_OBJECT_RUNLOCK(object);
object = backing_object;
}
- VM_OBJECT_WUNLOCK(object);
+ VM_OBJECT_RUNLOCK(object);
/*
* At the moment, vm_maps and objects aren't considered by
* the MAC system, so only things with backing by a normal
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