From: Shaohua Li <shli@kernel.org>
Date: Wed, 1 Aug 2012 22:33:00 +0000 (+1000)
Subject: raid5: make_request use batch stripe release
X-Git-Tag: v3.6-rc1~6^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8811b5968f6216e97ccb9fe7b9883af39e339921;p=pandora-kernel.git

raid5: make_request use batch stripe release

make_request() does stripe release for every stripe and the stripe usually has
count 1, which makes previous release_stripe() optimization not work. In my
test, this release_stripe() becomes the heaviest pleace to take
conf->device_lock after previous patches applied.

Below patch makes stripe release batch. All the stripes will be released in
unplug. The STRIPE_ON_UNPLUG_LIST bit is to protect concurrent access stripe
lru.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---

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