From 9a0e609e3fd8a95c96629b9fbde6b8c5b9a1456a Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Tue, 24 Feb 2015 11:03:22 -0500
Subject: [PATCH] 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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