linux-kernel - Re: [PATCH 02/19] io-controller: Common flat fair queuing code in elevaotor layer

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Date:	Wed, 17 Jun 2009 08:59:32 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Divyesh Shah <dpshah@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	jens.axboe@...cle.com, nauman@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, s-uchida@...jp.nec.com,
	taka@...inux.co.jp, guijianfeng@...fujitsu.com, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, jbaron@...hat.com,
	agk@...hat.com, snitzer@...hat.com, akpm@...ux-foundation.org,
	peterz@...radead.org
Subject: Re: [PATCH 02/19] io-controller: Common flat fair queuing code in
	elevaotor layer

On Tue, Jun 16, 2009 at 12:44:58PM -0700, Divyesh Shah wrote:
> On Mon, Jun 8, 2009 at 7:08 PM, Vivek Goyal<vgoyal@...hat.com> wrote:
> > void elv_deactivate_ioq(struct elv_fq_data *efqd, struct io_queue *ioq,
> > +                                       int requeue)
> > +{
> > +       if (ioq == efqd->active_queue)
> > +               elv_reset_active_ioq(efqd);
> > +
> > +       bfq_deactivate_entity(&ioq->entity, requeue);
> > +}
> 
> The check for ioq == efqd->active_queue and the call to
> elv_reset_active_ioq() seem to be unnecessary. This gets called from
> elv_del_ioq_busy() which has 2 callers which:
> - either explicitly check for ioq != efqd->active_queue
> - or call elv_reset_active_ioq() right before invoking this function
> 
> This was needed earlier as the io_ioq_move() function didn't fall in
> one of the 2 categories above. This has been done away with the ref
> counting patch, AFAICT.

True. Looks like we don't need above reset_active_ioq() call in
deactivate_ioq(). I will get rid of it in next posting. Thanks.

Vivek
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