linux-kernel - Re: Regarding dm-ioband tests

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Date:	Tue, 8 Sep 2009 22:36:49 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Ryo Tsuruta <ryov@...inux.co.jp>, riel@...hat.com,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	jens.axboe@...cle.com, agk@...hat.com, akpm@...ux-foundation.org,
	nauman@...gle.com, guijianfeng@...fujitsu.com, jmoyer@...hat.com,
	balbir@...ux.vnet.ibm.com
Subject: Re: Regarding dm-ioband tests

> > - dm-ioband can use without cgroup. (I remember Vivek said it's not an
> >   advantage.)
> 
> I think this is more of a disadvantage than advantage. We have a very well
> defined functionality of cgroup in kernel to group the tasks. Now you are
> coming up with your own method of grouping the tasks which will make life
> even more confusing for users and application writers.
> 

I would tend to agree with this. With other resource management
controllers using cgroups, having dm-ioband use something different will
require a different set of userspace tools/libraries to be used.
Something that will severly limit its usefulness froma programmer's
perspective.

thanks,
-- 
regards,
Dhaval
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