Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753061Ab0DOG7G (ORCPT ); Thu, 15 Apr 2010 02:59:06 -0400 Received: from bld-mail16.adl2.internode.on.net ([150.101.137.101]:47346 "EHLO mail.internode.on.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751608Ab0DOG7E (ORCPT ); Thu, 15 Apr 2010 02:59:04 -0400 Date: Thu, 15 Apr 2010 16:58:58 +1000 From: Dave Chinner To: KOSAKI Motohiro Cc: Mel Gorman , Chris Mason , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH] mm: disallow direct reclaim page writeback Message-ID: <20100415065858.GS2493@dastard> References: <20100415133332.D183.A69D9226@jp.fujitsu.com> <20100415063219.GR2493@dastard> <20100415154328.D18F.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100415154328.D18F.A69D9226@jp.fujitsu.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1350 Lines: 40 On Thu, Apr 15, 2010 at 03:44:50PM +0900, KOSAKI Motohiro wrote: > > > Now, kernel compile and/or backup operation seems keep nr_vmscan_write==0. > > > Dave, can you please try to run your pageout annoying workload? > > > > It's just as easy for you to run and observe the effects. Start with a VM > > with 1GB RAM and a 10GB scratch block device: > > > > # mkfs.xfs -f /dev/ > > # mount -o logbsize=262144,nobarrier /dev/ /mnt/scratch > > > > in one shell: > > > > # while [ 1 ]; do dd if=/dev/zero of=/mnt/scratch/foo bs=1024k ; done > > > > in another shell, if you have fs_mark installed, run: > > > > # ./fs_mark -S0 -n 100000 -F -s 0 -d /mnt/scratch/0 -d /mnt/scratch/1 -d /mnt/scratch/3 -d /mnt/scratch/2 & > > > > otherwise run a couple of these in parallel on different directories: > > > > # for i in `seq 1 1 100000`; do echo > /mnt/scratch/0/foo.$i ; done > > Thanks. > > Unfortunately, I don't have unused disks. So, I'll try it at (probably) > next week. A filesystem on a loopback device will work just as well ;) Cheers, Dave. -- Dave Chinner david@fromorbit.com -- 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/