From: Mike Snitzer <snitzer@redhat.com>
Date: Tue, 24 Feb 2015 16:03:22 +0000 (-0500)
Subject: dm: only run the queue on completion if congested or no requests pending
X-Git-Tag: omap-for-v4.1/fixes-rc1~106^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9a0e609e3fd8a95c96629b9fbde6b8c5b9a1456a;p=pandora-kernel.git

dm: only run the queue on completion if congested or no requests pending

On really fast storage it can be beneficial to delay running the
request_queue to allow the elevator more opportunity to merge requests.

Otherwise, it has been observed that requests are being sent to
q->request_fn much quicker than is ideal on IOPS-bound backends.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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