From: Mikulas Patocka <mpatocka@redhat.com>
Date: Wed, 10 Jul 2013 22:41:18 +0000 (+0100)
Subject: dm bufio: submit writes outside lock
X-Git-Tag: v3.11-rc1~20^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2480945cd44b50ba8b1646544eec2db21f064f12;p=pandora-kernel.git

dm bufio: submit writes outside lock

This patch changes dm-bufio so that it submits write I/Os outside of the
lock. If the number of submitted buffers is greater than the number of
requests on the target queue, submit_bio blocks. We want to block outside
of the lock to improve latency of other threads that may need the lock.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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