From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756071Ab1G2Js0 (ORCPT ); Fri, 29 Jul 2011 05:48:26 -0400 Received: from mail-pz0-f42.google.com ([209.85.210.42]:60716 "EHLO mail-pz0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755987Ab1G2JsZ (ORCPT ); Fri, 29 Jul 2011 05:48:25 -0400 Date: Fri, 29 Jul 2011 18:48:16 +0900 From: Minchan Kim To: Mel Gorman Cc: Linux-MM , LKML , XFS , Dave Chinner , Christoph Hellwig , Johannes Weiner , Wu Fengguang , Jan Kara , Rik van Riel Subject: Re: [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2 Message-ID: <20110729094816.GG1843@barrios-desktop> References: <1311265730-5324-1-git-send-email-mgorman@suse.de> <20110727161821.GA1738@barrios-desktop> <20110728113852.GN3010@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110728113852.GN3010@suse.de> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 28, 2011 at 12:38:52PM +0100, Mel Gorman wrote: > On Thu, Jul 28, 2011 at 01:18:21AM +0900, Minchan Kim wrote: > > On Thu, Jul 21, 2011 at 05:28:42PM +0100, Mel Gorman wrote: > > > Note how preventing kswapd reclaiming dirty pages pushes up its CPU > > > usage as it scans more pages but it does not get excessive due to > > > the throttling. > > > > Good to hear. > > The concern of this patchset was early OOM kill with too many scanning. > > I can throw such concern out from now on. > > > > At least, I haven't been able to trigger a premature OOM. AFAIR, Andrew had a premature OOM problem[1] but I couldn't track down at that time. I think this patch series might solve his problem. Although it doesn't, it should not accelerate his problem, at least. Andrew, Could you test this patchset? [1] https://lkml.org/lkml/2011/5/25/415 -- Kind regards, Minchan Kim