From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+w=401wt.eu-S1756461AbZEFDRM@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1756461AbZEFDRM (ORCPT <rfc822;w@1wt.eu>);
	Tue, 5 May 2009 23:17:12 -0400
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754240AbZEFDQ4
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Tue, 5 May 2009 23:16:56 -0400
Received: from cn.fujitsu.com ([222.73.24.84]:61652 "EHLO song.cn.fujitsu.com"
	rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP
	id S1753795AbZEFDQz (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Tue, 5 May 2009 23:16:55 -0400
Message-ID: <4A0100F4.4040400@cn.fujitsu.com>
Date: Wed, 06 May 2009 11:16:04 +0800
From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
User-Agent: Thunderbird 2.0.0.5 (Windows/20070716)
MIME-Version: 1.0
To: Vivek Goyal <vgoyal@redhat.com>
CC: nauman@google.com, dpshah@google.com, lizf@cn.fujitsu.com,
       mikew@google.com, fchecconi@gmail.com, paolo.valente@unimore.it,
       jens.axboe@oracle.com, ryov@valinux.co.jp, fernando@oss.ntt.co.jp,
       s-uchida@ap.jp.nec.com, taka@valinux.co.jp, jmoyer@redhat.com,
       dhaval@linux.vnet.ibm.com, balbir@linux.vnet.ibm.com,
       linux-kernel@vger.kernel.org, containers@lists.linux-foundation.org,
       righi.andrea@gmail.com, agk@redhat.com, dm-devel@redhat.com,
       snitzer@redhat.com, m-ikeda@ds.jp.nec.com, akpm@linux-foundation.org
Subject: Re: [PATCH 01/18] io-controller: Documentation
References: <1241553525-28095-1-git-send-email-vgoyal@redhat.com> <1241553525-28095-2-git-send-email-vgoyal@redhat.com>
In-Reply-To: <1241553525-28095-2-git-send-email-vgoyal@redhat.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Vivek Goyal wrote:
...
> +	mount -t cgroup -o io,blkio none /cgroup
> +
> +- Create two cgroups
> +	mkdir -p /cgroup/test1/ /cgroup/test2
> +
> +- Set weights of group test1 and test2
> +	echo 1000 > /cgroup/test1/io.ioprio
> +	echo 500 > /cgroup/test2/io.ioprio

  Here seems should be /cgroup/test2/io.weight

> +
> +- Create two same size files (say 512MB each) on same disk (file1, file2) and
> +  launch two dd threads in different cgroup to read those files. Make sure
> +  right io scheduler is being used for the block device where files are
> +  present (the one you compiled in hierarchical mode).
> +
> +	echo 1 > /proc/sys/vm/drop_caches
> +
> +	dd if=/mnt/lv0/zerofile1 of=/dev/null &
> +	echo $! > /cgroup/test1/tasks
> +	cat /cgroup/test1/tasks
> +
> +	dd if=/mnt/lv0/zerofile2 of=/dev/null &
> +	echo $! > /cgroup/test2/tasks
> +	cat /cgroup/test2/tasks
> +
> +- At macro level, first dd should finish first. To get more precise data, keep
> +  on looking at (with the help of script), at io.disk_time and io.disk_sectors
> +  files of both test1 and test2 groups. This will tell how much disk time
> +  (in milli seconds), each group got and how many secotors each group
> +  dispatched to the disk. We provide fairness in terms of disk time, so
> +  ideally io.disk_time of cgroups should be in proportion to the weight.
> +  (It is hard to achieve though :-)).

-- 
Regards
Gui Jianfeng