linux-kernel - Re: [PATCH 20/20] blkio: Drop the reference to queue once the task changes cgroup

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Date:	Wed, 04 Nov 2009 14:09:40 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, s-uchida@...jp.nec.com,
	taka@...inux.co.jp, guijianfeng@...fujitsu.com,
	balbir@...ux.vnet.ibm.com, righi.andrea@...il.com,
	m-ikeda@...jp.nec.com, akpm@...ux-foundation.org, riel@...hat.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 20/20] blkio: Drop the reference to queue once the task changes cgroup

Vivek Goyal <vgoyal@...hat.com> writes:

> o If a task changes cgroup, drop reference to the cfqq associated with io
>   context so that upon next request arrival we will allocate a  new queue in
>   new group.

You're doing more than dropping the reference, you're also setting the
pointer in the cic to NULL.  This is what you need to do, of course, but
your changelog is misleading (and sounds incomplete, and sends off
alarms in my head).

Cheers,
Jeff
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