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

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Message-ID: <4A9C3CDA.5010301@redhat.com>
Date:	Mon, 31 Aug 2009 17:12:58 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Vivek Goyal <vgoyal@...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,
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	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

Vivek Goyal wrote:
> 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.

Fair enough.  The code is small enough, anyway.

Acked-by: Rik van Riel <riel@...hat.com>

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