From owner-svn-src-stable-11@freebsd.org  Tue Apr 11 17:15:41 2017
Return-Path: <owner-svn-src-stable-11@freebsd.org>
Delivered-To: svn-src-stable-11@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 14E7BD3AD43;
 Tue, 11 Apr 2017 17:15:41 +0000 (UTC)
 (envelope-from markj@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id DACC5EF8;
 Tue, 11 Apr 2017 17:15:40 +0000 (UTC)
 (envelope-from markj@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v3BHFeoG049182;
 Tue, 11 Apr 2017 17:15:40 GMT (envelope-from markj@FreeBSD.org)
Received: (from markj@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id v3BHFeHq049181;
 Tue, 11 Apr 2017 17:15:40 GMT (envelope-from markj@FreeBSD.org)
Message-Id: <201704111715.v3BHFeHq049181@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: markj set sender to
 markj@FreeBSD.org using -f
From: Mark Johnston <markj@FreeBSD.org>
Date: Tue, 11 Apr 2017 17:15:40 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject: svn commit: r316709 - stable/11/sys/geom/mirror
X-SVN-Group: stable-11
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-stable-11@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: SVN commit messages for only the 11-stable src tree
 <svn-src-stable-11.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-stable-11>, 
 <mailto:svn-src-stable-11-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-stable-11/>
List-Post: <mailto:svn-src-stable-11@freebsd.org>
List-Help: <mailto:svn-src-stable-11-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-stable-11>, 
 <mailto:svn-src-stable-11-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 11 Apr 2017 17:15:41 -0000

Author: markj
Date: Tue Apr 11 17:15:39 2017
New Revision: 316709
URL: https://svnweb.freebsd.org/changeset/base/316709

Log:
  MFC r316175:
  Avoid sleeping when the mirror I/O queue is non-empty.

Modified:
  stable/11/sys/geom/mirror/g_mirror.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/geom/mirror/g_mirror.c
==============================================================================
--- stable/11/sys/geom/mirror/g_mirror.c	Tue Apr 11 17:13:56 2017	(r316708)
+++ stable/11/sys/geom/mirror/g_mirror.c	Tue Apr 11 17:15:39 2017	(r316709)
@@ -1894,6 +1894,10 @@ g_mirror_worker(void *arg)
 					kproc_exit(0);
 				}
 				mtx_lock(&sc->sc_queue_mtx);
+				if (bioq_first(&sc->sc_queue) != NULL) {
+					mtx_unlock(&sc->sc_queue_mtx);
+					continue;
+				}
 			}
 			sx_xunlock(&sc->sc_lock);
 			/*