From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932510AbYFFVCy (ORCPT ); Fri, 6 Jun 2008 17:02:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752862AbYFFVCo (ORCPT ); Fri, 6 Jun 2008 17:02:44 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:35574 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752459AbYFFVCn (ORCPT ); Fri, 6 Jun 2008 17:02:43 -0400 Date: Fri, 6 Jun 2008 14:02:16 -0700 From: Andrew Morton To: Rik van Riel Cc: linux-kernel@vger.kernel.org, lee.schermerhorn@hp.com, kosaki.motohiro@jp.fujitsu.com Subject: Re: [PATCH -mm 00/25] VM pageout scalability improvements (V10) Message-Id: <20080606140216.f4520f40.akpm@linux-foundation.org> In-Reply-To: <20080606202838.390050172@redhat.com> References: <20080606202838.390050172@redhat.com> X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.20; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 06 Jun 2008 16:28:38 -0400 Rik van Riel wrote: > On large memory systems, the VM can spend way too much time scanning > through pages that it cannot (or should not) evict from memory. Not > only does it use up CPU time, but it also provokes lock contention > and can leave large systems under memory presure in a catatonic state. > > Against 2.6.26-rc2-mm1 > > This patch series improves VM scalability by: -mm has a patch called vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch which has been sitting there for some time waiting for us to work out whether or not it is a desirable thing. This patchset of yours apparently retains the change which vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch makes. But do we know that it was a good one?