From owner-cvs-all@FreeBSD.ORG  Sun Feb  1 12:53:04 2004
Return-Path: <owner-cvs-all@FreeBSD.ORG>
Delivered-To: cvs-all@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 81C8A16A4CE; Sun,  1 Feb 2004 12:53:04 -0800 (PST)
Received: from cs.rice.edu (cs.rice.edu [128.42.1.30])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 815C643D3F; Sun,  1 Feb 2004 12:53:03 -0800 (PST)
	(envelope-from alc@cs.rice.edu)
Received: from localhost (localhost [127.0.0.1])
	by cs.rice.edu (Postfix) with ESMTP
	id C0E7C4AAD6; Sun,  1 Feb 2004 14:53:02 -0600 (CST)
Received: from cs.rice.edu ([127.0.0.1])
 by localhost (cs.rice.edu [127.0.0.1]) (amavisd-new, port 10024) with LMTP
 id 14361-01-14; Sun,  1 Feb 2004 14:53:00 -0600 (CST)
Received: by cs.rice.edu (Postfix, from userid 19572)
	id 621604AB4E; Sun,  1 Feb 2004 14:53:00 -0600 (CST)
Date: Sun, 1 Feb 2004 14:53:00 -0600
From: Alan Cox <alc@cs.rice.edu>
To: Alan Cox <alc@FreeBSD.org>
Message-ID: <20040201205300.GC22987@cs.rice.edu>
References: <200402012014.i11KE1PD082693@repoman.freebsd.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <200402012014.i11KE1PD082693@repoman.freebsd.org>
User-Agent: Mutt/1.3.28i
X-Virus-Scanned: by amavis-20030616-p5 at rice.edu
cc: cvs-src@FreeBSD.org
cc: src-committers@FreeBSD.org
cc: cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/i386/i386 pmap.c
X-BeenThere: cvs-all@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: CVS commit messages for the entire tree <cvs-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-all>
List-Post: <mailto:cvs-all@freebsd.org>
List-Help: <mailto:cvs-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 01 Feb 2004 20:53:04 -0000

On Sun, Feb 01, 2004 at 12:14:01PM -0800, Alan Cox wrote:
> alc         2004/02/01 12:14:01 PST
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/i386/i386        pmap.c 
>   Log:
>   Eliminate all TLB shootdowns by pmap_pte_quick(): By temporarily pinning
>   the thread that calls pmap_pte_quick() and by virtue of the page queues
>   lock being held, we can manage PADDR1/PMAP1 as a CPU private mapping.
>   
>   The most common effect of this change is to reduce the overhead of the page
>   daemon on multiprocessors.
>   
>   In collaboration with:  tegge
>   
>   Revision  Changes    Path
>   1.462     +52 -13    src/sys/i386/i386/pmap.c

If you want to see the number of IPIs for TLB shootdown that are avoided
on an SMP, run "sysctl debug.PMAP1changed".  After running a buildworld
"-j4" on a machine configured with 148MB, I got

debug.PMAP1changed: 3148562