linux-kernel - Re: [PATCH 3/8 v2] cfq-iosched: Introduce vdisktime and io weight for CFQ queue

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Date:	Mon, 13 Dec 2010 21:47:56 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Corrado Zoccolo <czoccolo@...il.com>,
	Chad Talbott <ctalbott@...gle.com>,
	Nauman Rafique <nauman@...gle.com>,
	Divyesh Shah <dpshah@...gle.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/8 v2] cfq-iosched: Introduce vdisktime and io weight
 for CFQ queue

On Tue, Dec 14, 2010 at 10:41:32AM +0800, Gui Jianfeng wrote:

[..]
> >> +
> >> +	/*
> >> +	 * update the io weight if io priority gets changed.
> >> +	 */
> >> +	cfqe->weight = cfq_prio_to_weight(cfqq->ioprio);
> > 
> > How do you know that this cfqe/cfqq is not already on the service tree? I
> > don't think you can update weights while you are enqueued on the tree.
> 
> Vivek, I'm not sure why we can't update weights if cfqe is enqueued on the tree.
> Do you mean when we update cfqe's weight we need to update tree's total_weight
> accordingly?

So far I can think of adjusting total_weight accordingly also if you are
updating the queue weight while it is on service tree.

Thanks
Vivek
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