linux-kernel - Re: IO scheduler based IO controller V10

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Message-Id: <1254508197.8667.22.camel@marge.simson.net>
Date:	Fri, 02 Oct 2009 20:29:57 +0200
From:	Mike Galbraith <efault@....de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, agk@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org,
	jmarchan@...hat.com, torvalds@...ux-foundation.org, mingo@...e.hu,
	riel@...hat.com
Subject: Re: IO scheduler based IO controller V10

On Fri, 2009-10-02 at 20:08 +0200, Jens Axboe wrote:
> On Thu, Oct 01 2009, Mike Galbraith wrote:
> >  	max_dispatch = cfqd->cfq_quantum;
> >  	if (cfq_class_idle(cfqq))
> >  		max_dispatch = 1;
> >  
> > +	if (cfqd->busy_queues > 1)
> > +		cfqd->od_stamp = jiffies;
> > +
> 
> ->busy_queues > 1 just means that they have requests ready for dispatch,
> not that they are dispatched.

But we're not alone, somebody else is using disk.  I'm trying to make
sure we don't have someone _about_ to come back.. like a reader, so when
there's another player, stamp to give him some time to wake up/submit
before putting the pedal to the metal.

	-Mike

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