Date: Tue, 4 Jun 2013 17:23:09 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r251391 - head/sys/security/mac Message-ID: <201306041723.r54HN9lg086178@svn.freebsd.org>
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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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