linux-kernel - Re: [PATCH 1/9] io-throttle documentation

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Message-ID: <49E7E1CF.6060209@cn.fujitsu.com>
Date:	Fri, 17 Apr 2009 09:56:31 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Andrea Righi <righi.andrea@...il.com>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>, agk@...rceware.org,
	akpm@...ux-foundation.org, axboe@...nel.dk, baramsori72@...il.com,
	Carl Henrik Lunde <chlunde@...g.uio.no>,
	dave@...ux.vnet.ibm.com, Divyesh Shah <dpshah@...gle.com>,
	eric.rannaud@...il.com, fernando@....ntt.co.jp,
	Hirokazu Takahashi <taka@...inux.co.jp>, matt@...ehost.com,
	dradford@...ehost.com, ngupta@...gle.com, randy.dunlap@...cle.com,
	roberto@...it.it, Ryo Tsuruta <ryov@...inux.co.jp>,
	Satoshi UCHIDA <s-uchida@...jp.nec.com>,
	subrata@...ux.vnet.ibm.com, yoshikawa.takuya@....ntt.co.jp,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] io-throttle documentation

KAMEZAWA Hiroyuki wrote:
> On Tue, 14 Apr 2009 22:21:12 +0200
> Andrea Righi <righi.andrea@...il.com> 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.
> 

IIUC, it also disallows other subsystems to be binded with blockio subsys:
  # mount -t cgroup -o blockio cpuset xxx /mnt
  (failed)

and if a task is moved from cg1(id=1) to cg2(id=2) in bio subsys, this task
will be moved from CG1(id=1) to CG2(id=2) automatically in blockio subsys.

All these are odd, unexpected, complex and bug-prone I think..

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