Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758849AbXHBQOv (ORCPT ); Thu, 2 Aug 2007 12:14:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755305AbXHBQOm (ORCPT ); Thu, 2 Aug 2007 12:14:42 -0400 Received: from calculon.skynet.ie ([193.1.99.88]:38627 "EHLO calculon.skynet.ie" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758744AbXHBQOl (ORCPT ); Thu, 2 Aug 2007 12:14:41 -0400 Date: Thu, 2 Aug 2007 17:14:37 +0100 To: KAMEZAWA Hiroyuki Cc: Lee Schermerhorn , Andrew Morton , linux-kernel , linux-mm , Christoph Lameter Subject: Re: [PATCH] 2.6.23-rc1-mm1 - fix missing numa_zonelist_order sysctl Message-ID: <20070802161437.GA22493@skynet.ie> References: <1185994972.5059.91.camel@localhost> <20070802094445.6495e25d.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20070802094445.6495e25d.kamezawa.hiroyu@jp.fujitsu.com> User-Agent: Mutt/1.5.13 (2006-08-11) From: mel@skynet.ie (Mel Gorman) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1424 Lines: 33 On (02/08/07 09:44), KAMEZAWA Hiroyuki didst pronounce: > On Wed, 01 Aug 2007 15:02:51 -0400 > Lee Schermerhorn wrote: > > [But, maybe reordering the zonelists is not such a good idea > > when ZONE_MOVABLE is populated?] > > > > It's case-by-case I think. In zone order with ZONE_MOVABLE case, > user's page cache will not use ZONE_NORMAL until ZONE_MOVABLE in all node > is exhausted. This is an expected behavior, I think. > This is expected behaviour. I see no reason for lower zones to be used for allocations that use memory from a higher zone with free memory. > I think the real problem is the scheme for "How to set zone movable size to > appropriate value for the system". This needs more study and documentation. > (but maybe depends on system configuration to some extent.) > It depends on the system configuration and the workload requirements. Right now, there isn't exact information available on what size the zone should be. It'll need to be studied over a period of time. -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/