From: Chris Mason <chris.mason@oracle.com>
Date: Fri, 13 Mar 2009 00:12:45 +0000 (-0400)
Subject: Btrfs: Check for a blocking lock before taking the spin
X-Git-Tag: v2.6.30-rc1~417^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=66d7e85ea7c3628189d19b265495358f756cb463;p=pandora-kernel.git

Btrfs: Check for a blocking lock before taking the spin

This reduces contention on the extent buffer spin locks by testing for a
blocking lock before trying to take the spinlock.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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