svn commit: r254460 - projects/camlock/sys/kern

[Alexander Motin]

Author: mav
Date: Sat Aug 17 18:38:00 2013
New Revision: 254460
URL: http://svnweb.freebsd.org/changeset/base/254460

Log:
  Remove locking from taskqueue_member().  The list of threads is static
  during the taskqueue life cycle, so there is no need to protect it,
  taking quite congested lock several more times for each ZFS I/O.

Modified:
  projects/camlock/sys/kern/subr_taskqueue.c

Modified: projects/camlock/sys/kern/subr_taskqueue.c
==============================================================================
--- projects/camlock/sys/kern/subr_taskqueue.c	Sat Aug 17 17:23:42 2013	(r254459)
+++ projects/camlock/sys/kern/subr_taskqueue.c	Sat Aug 17 18:38:00 2013	(r254460)
@@ -620,7 +620,6 @@ taskqueue_member(struct taskqueue *queue
 {
 	int i, j, ret = 0;
 
-	TQ_LOCK(queue);
 	for (i = 0, j = 0; ; i++) {
 		if (queue->tq_threads[i] == NULL)
 			continue;
@@ -631,6 +630,5 @@ taskqueue_member(struct taskqueue *queue
 		if (++j >= queue->tq_tcount)
 			break;
 	}
-	TQ_UNLOCK(queue);
 	return (ret);
 }