From: Justin TerAvest <teravest@google.com>
Date: Wed, 23 Mar 2011 07:25:44 +0000 (+0100)
Subject: cfq-iosched: Don't clear queue stats when preempt.
X-Git-Tag: v2.6.39-rc1~80^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=62a37f6badd1ac97ba07d543b5d4be2f9cb17217;p=pandora-kernel.git

cfq-iosched: Don't clear queue stats when preempt.

For v2, I added back lines to cfq_preempt_queue() that were removed
during updates for accounting unaccounted_time. Thanks for pointing out
that I'd missed these, Vivek.

Previous commit "cfq-iosched: Don't set active queue in preempt" wrongly
cleared stats for preempting queues when it shouldn't have, because when
we choose a queue to preempt, it still isn't necessarily scheduled next.

Thanks to Vivek Goyal for figuring this out and understanding how the
preemption code works.

Signed-off-by: Justin TerAvest <teravest@google.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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