linux-kernel - Re: Regarding dm-ioband tests

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Message-ID: <20090908032254.GJ8315@balbir.in.ibm.com>
Date:	Tue, 8 Sep 2009 08:52:55 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Ryo Tsuruta <ryov@...inux.co.jp>
Cc:	riel@...hat.com, vgoyal@...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
Subject: Re: Regarding dm-ioband tests

* Ryo Tsuruta <ryov@...inux.co.jp> [2009-09-08 12:01:19]:

> I think there are some advantages to dm-ioband. That's why I post
> dm-ioband to the mailing list.
> 
> - dm-ioband supports not only proportional weight policy but also rate
>   limiting policy. Besides, new policies can be added to dm-ioband if
>   a user wants to control bandwidth by his or her own policy.
> - The dm-ioband driver can be replaced without stopping the system by
>   using device-mapper's facility. It's easy to maintain.
> - dm-ioband can use without cgroup. (I remember Vivek said it's not an
>   advantage.)

But don't you need page_cgroup for IO tracking?

-- 
	Balbir
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