linux-kernel - Re: dm-ioband + bio-cgroup benchmarks

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Message-ID: <48DA34AD.4040305@linux.vnet.ibm.com>
Date:	Wed, 24 Sep 2008 18:08:05 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Hirokazu Takahashi <taka@...inux.co.jp>
CC:	vgoyal@...hat.com, ryov@...inux.co.jp,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com, fernando@....ntt.co.jp,
	xemul@...nvz.org, agk@...rceware.org, righi.andrea@...il.com,
	jens.axboe@...cle.com
Subject: Re: dm-ioband + bio-cgroup benchmarks

Hirokazu Takahashi wrote:
> Hi,
> 
>>> It's possible the algorithm of dm-ioband can be placed in the block layer
>>> if it is really a big problem.
>>> But I doubt it can control every control block I/O as we wish since
>>> the interface the cgroup supports is quite poor.
>> Had a question regarding cgroup interface. I am assuming that in a system,
>> one will be using other controllers as well apart from IO-controller.
>> Other controllers will be using cgroup as a grouping mechanism.
>> Now coming up with additional grouping mechanism for only io-controller seems
>> little odd to me. It will make the job of higher level management software
>> harder.
>>
>> Looking at the dm-ioband grouping examples given in patches, I think cases
>> of grouping based  in pid, pgrp, uid and kvm can be handled by creating right
>> cgroup and making sure applications are launched/moved into right cgroup by
>> user space tools. 
> 
> Grouping in pid, pgrp and uid is not the point, which I've been thinking
> can be replaced with cgroup once the implementation of bio-cgroup is done.
> 
> I think problems of cgroup are that they can't support lots of storages
> and hotplug devices, it just handle them as if they were just one resource.

Could you elaborate on this please?

> I don't insist the interface of dm-ioband is the best. I just hope the
> cgroup infrastructure support this kind of resources.
> 

What sort of support will help you?



-- 
	Balbir
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