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From: Alexander Motin <mav@FreeBSD.org>
Date: Sat, 24 Aug 2013 14:41:49 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r254787 - head/sys/kern
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Author: mav
Date: Sat Aug 24 14:41:49 2013
New Revision: 254787
URL: http://svnweb.freebsd.org/changeset/base/254787

Log:
  MFprojects/camlock r254460:
  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:
  head/sys/kern/subr_taskqueue.c

Modified: head/sys/kern/subr_taskqueue.c
==============================================================================
--- head/sys/kern/subr_taskqueue.c	Sat Aug 24 14:33:11 2013	(r254786)
+++ head/sys/kern/subr_taskqueue.c	Sat Aug 24 14:41:49 2013	(r254787)
@@ -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);
 }