linux-kernel - Re: [PATCH 23/23] io-controller: debug elevator fair queuing support

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Message-ID: <20090831210154.GA8229@redhat.com>
Date:	Mon, 31 Aug 2009 17:01:54 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	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, 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, agk@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org,
	jmarchan@...hat.com, torvalds@...ux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH 23/23] io-controller: debug elevator fair queuing
	support

On Mon, Aug 31, 2009 at 04:57:53PM -0400, Rik van Riel wrote:
> Vivek Goyal wrote:
>> o More debugging help to debug elevator fair queuing support. Enabled under
>>   CONFIG_DEBUG_ELV_FAIR_QUEUING. Currently it prints vdisktime related
>>   trace messages in blktrace.
>>
>> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
>
> Is this meant for merging upstream, or just as a temporary
> debugging help while this sits in a subsystem tree or -mm?

I think it would be good if this also is merged upstream. A useful
debugging help to track fairness and latecy related issues.

Thanks
Vivek
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