From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757459AbYIRWXV (ORCPT ); Thu, 18 Sep 2008 18:23:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755412AbYIRWXG (ORCPT ); Thu, 18 Sep 2008 18:23:06 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:56731 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754352AbYIRWXF (ORCPT ); Thu, 18 Sep 2008 18:23:05 -0400 Date: Fri, 19 Sep 2008 07:21:34 +0900 (JST) From: KOSAKI Motohiro To: Christoph Lameter Subject: Re: Populating multiple ptes at fault time Cc: kosaki.motohiro@jp.fujitsu.com, Jeremy Fitzhardinge , Chris Snook , Nick Piggin , Hugh Dickens , Linux Memory Management List , Linux Kernel Mailing List , Avi Kivity , Andrew Morton , Rik van Riel , "Martin J. Bligh" In-Reply-To: <48D2AE6C.7060507@linux-foundation.org> References: <48D2A392.6010308@goop.org> <48D2AE6C.7060507@linux-foundation.org> Message-Id: <20080920191928.50ED.KOSAKI.MOTOHIRO@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.42 [ja] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Jeremy Fitzhardinge wrote: > > Thanks, that was exactly what I was hoping to see. I didn't see any > > definitive statements against the patch set, other than a concern that > > it could make things worse. Was the upshot that no consensus was > > reached about how to detect when its beneficial to preallocate anonymous > > pages? > > There were multiple discussions on the subject. The consensus was that it was > difficult to generalize this and it would only work on special loads. Plus it > would add some overhead to the general case. but at that time, x86_64 large server doesn't exist yet. I think mesurement again is valuable because typical server environment is changed in these days.