From owner-svn-src-all@freebsd.org  Fri Oct 20 08:25:51 2017
Return-Path: <owner-svn-src-all@freebsd.org>
Delivered-To: svn-src-all@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 26800E52B33;
 Fri, 20 Oct 2017 08:25:51 +0000 (UTC) (envelope-from kib@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 DD6A96D416;
 Fri, 20 Oct 2017 08:25:50 +0000 (UTC) (envelope-from kib@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v9K8Po3N036641;
 Fri, 20 Oct 2017 08:25:50 GMT (envelope-from kib@FreeBSD.org)
Received: (from kib@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id v9K8PoYa036640;
 Fri, 20 Oct 2017 08:25:50 GMT (envelope-from kib@FreeBSD.org)
Message-Id: <201710200825.v9K8PoYa036640@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org
 using -f
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 20 Oct 2017 08:25:50 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r324793 - head/sys/vm
X-SVN-Group: head
X-SVN-Commit-Author: kib
X-SVN-Commit-Paths: head/sys/vm
X-SVN-Commit-Revision: 324793
X-SVN-Commit-Repository: base
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
 user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-all>,
 <mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all/>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-all>,
 <mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 20 Oct 2017 08:25:51 -0000

Author: kib
Date: Fri Oct 20 08:25:49 2017
New Revision: 324793
URL: https://svnweb.freebsd.org/changeset/base/324793

Log:
  In vm_page_free_phys_pglist(), do not take vm_page_queue_free_mtx if
  there is nothing to do.
  
  Suggested by:	mjg
  Reviewed by:	alc
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/vm/vm_page.c

Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c	Fri Oct 20 08:20:15 2017	(r324792)
+++ head/sys/vm/vm_page.c	Fri Oct 20 08:25:49 2017	(r324793)
@@ -2857,6 +2857,8 @@ vm_page_free_phys_pglist(struct pglist *tq)
 {
 	vm_page_t m;
 
+	if (TAILQ_EMPTY(tq))
+		return;
 	mtx_lock(&vm_page_queue_free_mtx);
 	TAILQ_FOREACH(m, tq, listq)
 		vm_page_free_phys(m);