linux-kernel - Re: [PATCH] cfq-iosched: Do not merge queues of BE and IDLE classes

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Date:	Thu, 25 Mar 2010 15:45:28 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Divyesh Shah <dpshah@...gle.com>
Cc:	linux-kernel@...r.kernel.org, nauman@...gle.com, vgoyal@...hat.com
Subject: Re: [PATCH] cfq-iosched: Do not merge queues of BE and IDLE classes

On Wed, Mar 24 2010, Divyesh Shah wrote:
> even if they are found to be co-operating.
> 
> The prio_trees do not have any IDLE cfqqs on them. cfq_close_cooperator()
> is called from cfq_select_queue() and cfq_completed_request(). The latter
> ensures that the close cooperator code does not get invoked if the current
> cfqq is of class IDLE but the former doesn't seem to have any such checks.
> So an IDLE cfqq may get merged with a BE cfqq from the same group which
> should be avoided.

Thanks, applied.

-- 
Jens Axboe

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