From owner-svn-src-projects@FreeBSD.ORG  Sat Aug 17 18:38:01 2013
Return-Path: <owner-svn-src-projects@FreeBSD.ORG>
Delivered-To: svn-src-projects@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id 4669463C;
 Sat, 17 Aug 2013 18:38:01 +0000 (UTC) (envelope-from mav@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org
 [IPv6:2001:1900:2254:2068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 34766257A;
 Sat, 17 Aug 2013 18:38:01 +0000 (UTC)
Received: from svn.freebsd.org ([127.0.1.70])
 by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id r7HIc1jf063862;
 Sat, 17 Aug 2013 18:38:01 GMT (envelope-from mav@svn.freebsd.org)
Received: (from mav@localhost)
 by svn.freebsd.org (8.14.7/8.14.5/Submit) id r7HIc1SR063861;
 Sat, 17 Aug 2013 18:38:01 GMT (envelope-from mav@svn.freebsd.org)
Message-Id: <201308171838.r7HIc1SR063861@svn.freebsd.org>
From: Alexander Motin <mav@FreeBSD.org>
Date: Sat, 17 Aug 2013 18:38:01 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-projects@freebsd.org
Subject: svn commit: r254460 - projects/camlock/sys/kern
X-SVN-Group: projects
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-projects@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: "SVN commit messages for the src &quot; projects&quot;
 tree" <svn-src-projects.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-projects>, 
 <mailto:svn-src-projects-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-projects>
List-Post: <mailto:svn-src-projects@freebsd.org>
List-Help: <mailto:svn-src-projects-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-projects>, 
 <mailto:svn-src-projects-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 17 Aug 2013 18:38:01 -0000

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);
 }