Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753314AbZDWFjU (ORCPT ); Thu, 23 Apr 2009 01:39:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751382AbZDWFjI (ORCPT ); Thu, 23 Apr 2009 01:39:08 -0400 Received: from fgwmail7.fujitsu.co.jp ([192.51.44.37]:37928 "EHLO fgwmail7.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751271AbZDWFjH (ORCPT ); Thu, 23 Apr 2009 01:39:07 -0400 Date: Thu, 23 Apr 2009 14:37:30 +0900 From: KAMEZAWA Hiroyuki To: Andrew Morton Cc: Theodore Tso , Andrea Righi , randy.dunlap@oracle.com, Carl Henrik Lunde , Jens Axboe , eric.rannaud@gmail.com, Balbir Singh , fernando@oss.ntt.co.jp, dradford@bluehost.com, Gui@smtp1.linux-foundation.org, agk@sourceware.org, subrata@linux.vnet.ibm.com, Paul Menage , containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, dave@linux.vnet.ibm.com, matt@bluehost.com, roberto@unbit.it, ngupta@google.com Subject: Re: [PATCH 9/9] ext3: do not throttle metadata and journal IO Message-Id: <20090423143730.a289f0c1.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20090422215825.f83e1b27.akpm@linux-foundation.org> References: <20090421174620.GD15541@mit.edu> <20090421181429.GO19637@balbir.in.ibm.com> <20090421191401.GF15541@mit.edu> <20090421204905.GA5573@linux> <20090422093349.1ee9ae82.kamezawa.hiroyu@jp.fujitsu.com> <20090422102153.9aec17b9.kamezawa.hiroyu@jp.fujitsu.com> <20090422102239.GA1935@linux> <20090423090535.ec419269.kamezawa.hiroyu@jp.fujitsu.com> <20090423012254.GZ15541@mit.edu> <20090423115419.c493266a.kamezawa.hiroyu@jp.fujitsu.com> <20090423043547.GB2723@mit.edu> <20090422215825.f83e1b27.akpm@linux-foundation.org> Organization: FUJITSU Co. LTD. X-Mailer: Sylpheed 2.5.0 (GTK+ 2.10.14; i686-pc-mingw32) 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 Content-Length: 1126 Lines: 28 On Wed, 22 Apr 2009 21:58:25 -0700 Andrew Morton wrote: > > Or at least that *someone* is > > doing so and can perhaps document how all of these knobs interact. > > After all, if they are going to be separate, and someone turns the I/O > > throttling knob without bothering to turn the write throttling knob > > --- what's going to happen? An OOM? That's not going to be very safe > > or friendly for the sysadmin who plans to be configuring the system. > > ... this problem. > Considering that low-io-limit cgroup as very slow device, the problem itself is not far from that the current kernel has. If per-bdi-dirty-ratio works well, we can write per-cgroup-dirty-ratio, I think. (I'll do if I find time.) But yes, configuration-how-to should be documented, finally. I hope sysadmins will not use some acrobatic configuration ;) Thanks, -Kame -- 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/