From owner-cvs-src@FreeBSD.ORG  Wed Nov  3 20:17:32 2004
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 4309D16A4CE; Wed,  3 Nov 2004 20:17:32 +0000 (GMT)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 322BE43D3F; Wed,  3 Nov 2004 20:17:32 +0000 (GMT)
	(envelope-from alc@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.12.11/8.12.11) with ESMTP id iA3KHWia031698;
	Wed, 3 Nov 2004 20:17:32 GMT
	(envelope-from alc@repoman.freebsd.org)
Received: (from alc@localhost)
	by repoman.freebsd.org (8.12.11/8.12.11/Submit) id iA3KHWJX031697;
	Wed, 3 Nov 2004 20:17:32 GMT
	(envelope-from alc)
Message-Id: <200411032017.iA3KHWJX031697@repoman.freebsd.org>
From: Alan Cox <alc@FreeBSD.org>
Date: Wed, 3 Nov 2004 20:17:32 +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/kern kern_subr.c uipc_jumbo.c uipc_syscalls.c
 vfs_bio.c src/sys/sparc64/sparc64 pmap.c src/sys/vm vm_contig.c
 vm_glue.c vm_object.c vm_page.c vm_pageout.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, 03 Nov 2004 20:17:32 -0000

alc         2004-11-03 20:17:32 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_subr.c uipc_jumbo.c uipc_syscalls.c 
                         vfs_bio.c 
    sys/sparc64/sparc64  pmap.c 
    sys/vm               vm_contig.c vm_glue.c vm_object.c 
                         vm_page.c vm_pageout.c 
  Log:
  The synchronization provided by vm object locking has eliminated the
  need for most calls to vm_page_busy().  Specifically, most calls to
  vm_page_busy() occur immediately prior to a call to vm_page_remove().
  In such cases, the containing vm object is locked across both calls.
  Consequently, the setting of the vm page's PG_BUSY flag is not even
  visible to other threads that are following the synchronization
  protocol.
  
  This change (1) eliminates the calls to vm_page_busy() that
  immediately precede a call to vm_page_remove() or functions, such as
  vm_page_free() and vm_page_rename(), that call it and (2) relaxes the
  requirement in vm_page_remove() that the vm page's PG_BUSY flag is
  set.  Now, the vm page's PG_BUSY flag is set only when the vm object
  lock is released while the vm page is still in transition.  Typically,
  this is when it is undergoing I/O.
  
  Revision  Changes    Path
  1.90      +0 -2      src/sys/kern/kern_subr.c
  1.11      +0 -1      src/sys/kern/uipc_jumbo.c
  1.205     +0 -1      src/sys/kern/uipc_syscalls.c
  1.464     +0 -2      src/sys/kern/vfs_bio.c
  1.140     +0 -1      src/sys/sparc64/sparc64/pmap.c
  1.40      +0 -2      src/sys/vm/vm_contig.c
  1.206     +0 -2      src/sys/vm/vm_glue.c
  1.333     +0 -3      src/sys/vm/vm_object.c
  1.298     +5 -14     src/sys/vm/vm_page.c
  1.265     +0 -2      src/sys/vm/vm_pageout.c