From: Heinz Mauelshagen <heinzm@redhat.com>
Date: Thu, 5 Jun 2014 14:23:09 +0000 (+0100)
Subject: dm bio prison: implement per bucket locking in the dm_bio_prison hash table
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~37^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=adcc44472bacb227ebc0b1a8876efa5302474338;p=pandora-kernel.git

dm bio prison: implement per bucket locking in the dm_bio_prison hash table

Split the single per bio-prison lock by using per bucket locking.  Per
bucket locking benefits both dm-thin and dm-cache targets by reducing
bio-prison lock contention.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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