Author: rwatson
Date: Wed Feb 25 11:44:03 2009
New Revision: 189031
URL: http://svn.freebsd.org/changeset/base/189031
Log:
Merge r186825 from head to stable/7:
Do a lockless read of the audit pipe list before grabbing the audit pipe
lock in order to avoid the lock acquire hit if the pipe list is very
likely empty.
Obtained from: TrustedBSD Project
Sponsored by: Apple, Inc.
Modified:
stable/7/sys/ (props changed)
stable/7/sys/contrib/pf/ (props changed)
stable/7/sys/dev/ath/ath_hal/ (props changed)
stable/7/sys/dev/cxgb/ (props changed)
stable/7/sys/security/audit/audit_pipe.c
Modified: stable/7/sys/security/audit/audit_pipe.c
==============================================================================
--- stable/7/sys/security/audit/audit_pipe.c Wed Feb 25 11:37:19 2009
(r189030)
+++ stable/7/sys/security/audit/audit_pipe.c Wed Feb 25 11:44:03 2009
(r189031)
@@ -407,6 +407,10 @@ audit_pipe_preselect(au_id_t auid, au_ev
{
struct audit_pipe *ap;
+ /* Lockless read to avoid acquiring the global lock if not needed. */
+ if (TAILQ_EMPTY(&audit_pipe_list))
+ return (0);
+
AUDIT_PIPE_LIST_RLOCK();
TAILQ_FOREACH(ap, &audit_pipe_list, ap_list) {
AUDIT_PIPE_LOCK(ap);
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