linux-kernel - Re: [PATCH] cgroup: limit block I/O bandwidth

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Message-ID: <20080120145844.GN8973@balbir.in.ibm.com>
Date:	Sun, 20 Jan 2008 20:28:44 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Andrea Righi <righiandr@...rs.sourceforge.net>,
	Naveen Gupta <ngupta@...gle.com>,
	Paul Menage <menage@...gle.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [PATCH] cgroup: limit block I/O bandwidth

* Jens Axboe <jens.axboe@...cle.com> [2008-01-20 15:32:40]:

> On Sun, Jan 20 2008, Andrea Righi wrote:
> Your approach is totally flawed, imho. For instance, you don't want a
> process to be able to dirty memory at foo mb/sec but only actually
> write them out at bar mb/sec.
> 
> The noop-iosched changes are also very buggy. The queue back pointer
> breaks reference counting and the task pointer storage assumes the task
> will also always be around. That's of course not the case.
> 
> IOW, you are doing this at the wrong level.

Andrea, Some of the problems pointed out so far have been solved in
the IO controller from OpenVZ (cc'ing Pavel for inputs).

> 
> What problem are you trying to solve?
> 
> -- 
> Jens Axboe
> 

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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