From: Jeff Moyer <jmoyer@redhat.com>
Date: Fri, 23 Oct 2009 21:14:52 +0000 (-0400)
Subject: cfq: break apart merged cfqqs if they stop cooperating
X-Git-Tag: v2.6.33-rc1~379^2~85
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e6c5bc737ab71e4af6025ef7d150f5a26ae5f146;p=pandora-kernel.git

cfq: break apart merged cfqqs if they stop cooperating

cfq_queues are merged if they are issuing requests within the mean seek
distance of one another.  This patch detects when the coopearting stops and
breaks the queues back up.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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