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

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Message-ID: <20090417095555.GD8689@linux>
Date:	Fri, 17 Apr 2009 11:55:56 +0200
From:	Andrea Righi <righi.andrea@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	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>,
	Li Zefan <lizf@...fujitsu.com>, 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

On Fri, Apr 17, 2009 at 10:24:17AM +0900, 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.
> 
> Thanks,
> -Kame

I totally agree. I could easily merge the bio-cgroup functionality in
io-throttle or implement this as an infrastructure framework, using a
single controller and remove this complication.

For now, since the decisions on IO controllers are not definitive at
all, I privileged flexibility and I simply decided to be a plain user of
bio-cgroup to quickly adapt my patch to the future bio-cgroup
development.

Thanks,
-Andrea
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