linux-kernel - Re: [PATCH][v2] cfq-iosched: Add additional blktrace log messages in CFQ for easier debugging.

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Date:	Thu, 25 Mar 2010 15:44:18 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Divyesh Shah <dpshah@...gle.com>
Cc:	linux-kernel@...r.kernel.org, nauman@...gle.com, vgoyal@...hat.com,
	ctalbott@...gle.com
Subject: Re: [PATCH][v2] cfq-iosched: Add additional blktrace log messages
	in CFQ  for easier debugging.

On Wed, Mar 24 2010, Divyesh Shah wrote:
> These have helped us debug some issues we've noticed in earlier IO
> controller versions and should be useful now as well. The extra logging
> covers:
> - idling behavior. Since there are so many conditions based on which we decide
> to idle or not, this patch adds a log message for some conditions that we've
> found useful.
> - workload slices and current prio and workload type
> 
> Changelog from v1:
> o moved log message from cfq_set_active_queue() to __cfq_set_active_queue()
> o changed queue_count to st->count

Definitely makes sense, thanks I'll queue it up.

-- 
Jens Axboe

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