From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <dan@embeddededge.com>
Received: from penguin.netx4.com (embeddededge.com [209.113.146.155])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(Client did not present a certificate)
	by ozlabs.org (Postfix) with ESMTP id D89D567AC5
	for <linuxppc-embedded@ozlabs.org>;
	Sun, 24 Apr 2005 07:29:37 +1000 (EST)
In-Reply-To: <BCEFJBPJCGFCNMMMIDBHCEIICLAA.Joakim.Tjernlund@lumentis.se>
References: <BCEFJBPJCGFCNMMMIDBHCEIICLAA.Joakim.Tjernlund@lumentis.se>
Mime-Version: 1.0 (Apple Message framework v622)
Content-Type: text/plain; charset=US-ASCII; format=flowed
Message-Id: <42b1a4ca0138e9576d010ec2754eb29a@embeddededge.com>
From: Dan Malek <dan@embeddededge.com>
Date: Sat, 23 Apr 2005 17:29:17 -0400
To: Joakim.Tjernlund@lumentis.se
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: [26-devel] v2.6 performance slowdown on MPC8xx: Measuring TLB
	cache misses
List-Id: Linux on Embedded PowerPC Developers Mail List
	<linuxppc-embedded.ozlabs.org>
List-Unsubscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-embedded>,
	<mailto:linuxppc-embedded-request@ozlabs.org?subject=unsubscribe>
List-Archive: <http://ozlabs.org/pipermail/linuxppc-embedded>
List-Post: <mailto:linuxppc-embedded@ozlabs.org>
List-Help: <mailto:linuxppc-embedded-request@ozlabs.org?subject=help>
List-Subscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-embedded>,
	<mailto:linuxppc-embedded-request@ozlabs.org?subject=subscribe>


On Apr 23, 2005, at 1:35 PM, Joakim Tjernlund wrote:

> Is it possible to handle the _PAGE_ACCESSED handling at pte creation 
> in fault.c instead
> of doing it for every TLB miss? That should make the TLB Miss handler 
> faster.

No.  As part of VM management to determine working sets, it's possible 
to have
this flag change state but the page to remain valid.  The cost of 
setting this properly
in the miss handler is minimal compared to the other stuff that we 
should try
and streamline.

Thanks.

	-- Dan