linux-kernel - Re: [PATCH 01/10] Documentation

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Message-ID: <20090324183532.GG21389@redhat.com>
Date:	Tue, 24 Mar 2009 14:35:32 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Fabio Checconi <fchecconi@...il.com>
Cc:	Nauman Rafique <nauman@...gle.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>, dpshah@...gle.com,
	lizf@...fujitsu.com, mikew@...gle.com, paolo.valente@...more.it,
	jens.axboe@...cle.com, ryov@...inux.co.jp,
	fernando@...ellilink.co.jp, s-uchida@...jp.nec.com,
	taka@...inux.co.jp, arozansk@...hat.com, jmoyer@...hat.com,
	oz-kernel@...hat.com, balbir@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, akpm@...ux-foundation.org,
	menage@...gle.com, peterz@...radead.org
Subject: Re: [PATCH 01/10] Documentation

On Tue, Mar 24, 2009 at 07:41:01PM +0100, Fabio Checconi wrote:
> > From: Vivek Goyal <vgoyal@...hat.com>
> > Date: Tue, Mar 24, 2009 02:29:06PM -0400
> >
> ...
> > > Does keeping the sync queue in ready tree solves the problem too? Is
> > > it because it avoid a virtual time jump?
> > > 
> > 
> > I have not tried the second approch yet. But that also should solve the
> > vtime jump issue.
> > 
> 
> Do you mean that you intend to keep a queue with no backlog in the
> active tree?

Yes. Is it possible to keep a not-backlogged queue in the tree for later
expiry. So that we don't actively wait/idle for next request to come and
hope queue will become backlogged soon. Otherwise, it will be deleted from
the active queue. This is just a thought, I am not even sure how would it
interefere with bfq code.

All this to solve the vtime jump issue for sync queues.

Thanks
Vivek
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