From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Fri, 8 May 2009 12:53:52 +0000 (+0200)
Subject: kill-the-bkl/reiserfs: factorize the locking in reiserfs_write_end()
X-Git-Tag: v2.6.33-rc1~360^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6f5b0aa08078c3dabe377d5b1a6077e9c9352d3;p=pandora-kernel.git

kill-the-bkl/reiserfs: factorize the locking in reiserfs_write_end()

reiserfs_write_end() is a hot path in reiserfs.
We have two wasteful write lock lock/release inside that can be gathered
without changing the code logic.

This patch factorizes them out in a single protected section, reducing the
number of contentions inside.

[ Impact: reduce lock contention in a reiserfs hotpath ]

Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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