From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759844AbZDQHf2 (ORCPT ); Fri, 17 Apr 2009 03:35:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755288AbZDQHfQ (ORCPT ); Fri, 17 Apr 2009 03:35:16 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:65418 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751131AbZDQHfO (ORCPT ); Fri, 17 Apr 2009 03:35:14 -0400 Message-ID: <49E8311D.5030901@cn.fujitsu.com> Date: Fri, 17 Apr 2009 15:34:53 +0800 From: Gui Jianfeng User-Agent: Thunderbird 2.0.0.5 (Windows/20070716) MIME-Version: 1.0 To: KAMEZAWA Hiroyuki CC: Andrea Righi , Paul Menage , Balbir Singh , agk@sourceware.org, akpm@linux-foundation.org, axboe@kernel.dk, baramsori72@gmail.com, Carl Henrik Lunde , dave@linux.vnet.ibm.com, Divyesh Shah , eric.rannaud@gmail.com, fernando@oss.ntt.co.jp, Hirokazu Takahashi , Li Zefan , matt@bluehost.com, dradford@bluehost.com, ngupta@google.com, randy.dunlap@oracle.com, roberto@unbit.it, Ryo Tsuruta , Satoshi UCHIDA , subrata@linux.vnet.ibm.com, yoshikawa.takuya@oss.ntt.co.jp, containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/9] io-throttle documentation References: <1239740480-28125-1-git-send-email-righi.andrea@gmail.com> <1239740480-28125-2-git-send-email-righi.andrea@gmail.com> <20090417102417.88a0ef93.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20090417102417.88a0ef93.kamezawa.hiroyu@jp.fujitsu.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org KAMEZAWA Hiroyuki wrote: > On Tue, 14 Apr 2009 22:21:12 +0200 > Andrea Righi wrote: > >> +Example: >> +* Create an association between an io-throttle group and a bio-cgroup group >> + with "bio" and "blockio" subsystems mounted in different mount points: >> + # mount -t cgroup -o bio bio-cgroup /mnt/bio-cgroup/ >> + # cd /mnt/bio-cgroup/ >> + # mkdir bio-grp >> + # cat bio-grp/bio.id >> + 1 >> + # mount -t cgroup -o blockio blockio /mnt/io-throttle >> + # cd /mnt/io-throttle >> + # mkdir foo >> + # echo 1 > foo/blockio.bio_id > > Why do we need multiple cgroups at once to track I/O ? > Seems complicated to me. Hi Kamezawa-san, The original thought to implement this function is for sharing a bio-cgroup with other subsystems, such as dm-ioband. If the bio-cgroup is already mounted, and used by dm-ioband or others, we just need to create a association between io-throttle and bio-cgroup by echo a bio-cgroup id, just like what dm-ioband does. > > Thanks, > -Kame > > > > -- Regards Gui Jianfeng