From owner-cvs-src@FreeBSD.ORG  Wed Mar 30 05:40:02 2005
Return-Path: <owner-cvs-src@FreeBSD.ORG>
Delivered-To: cvs-src@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id DDE2016A4CE; Wed, 30 Mar 2005 05:40:02 +0000 (GMT)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id AE6E943D48; Wed, 30 Mar 2005 05:40:02 +0000 (GMT)
	(envelope-from alc@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.13.1/8.13.1) with ESMTP id j2U5e2MT005687;
	Wed, 30 Mar 2005 05:40:02 GMT
	(envelope-from alc@repoman.freebsd.org)
Received: (from alc@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id j2U5e2kF005686;
	Wed, 30 Mar 2005 05:40:02 GMT
	(envelope-from alc)
Message-Id: <200503300540.j2U5e2kF005686@repoman.freebsd.org>
From: Alan Cox <alc@FreeBSD.org>
Date: Wed, 30 Mar 2005 05:40:02 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/vm vm_object.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 30 Mar 2005 05:40:03 -0000

alc         2005-03-30 05:40:02 UTC

  FreeBSD src repository

  Modified files:
    sys/vm               vm_object.c 
  Log:
  Eliminate (now) unnecessary acquisition and release of the global page
  queues lock in vm_object_backing_scan().  Updates to the page's PG_BUSY
  flag and busy field are synchronized by the containing object's lock.
  
  Testing the page's hold_count and wire_count in vm_object_backing_scan()'s
  OBSC_COLLAPSE_NOWAIT case is unnecessary.  There is no reason why the held
  or wired pages cannot be migrated to the shadow object.
  
  Reviewed by: tegge
  
  Revision  Changes    Path
  1.347     +1 -5      src/sys/vm/vm_object.c