From: Josef Bacik <josef@redhat.com>
Date: Tue, 2 Feb 2010 21:48:28 +0000 (+0000)
Subject: Btrfs: change the ordered tree to use a spinlock instead of a mutex
X-Git-Tag: v2.6.34-rc2~21^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49958fd7dbb83cd4d65179d025940e01fe1fbacd;p=pandora-kernel.git

Btrfs: change the ordered tree to use a spinlock instead of a mutex

The ordered tree used to need a mutex, but currently all we use it for is to
protect the rb_tree, and a spin_lock is just fine for that.  Using a spin_lock
instead makes dbench run a little faster, 58 mb/s instead of 51 mb/s, and have
less latency, 3445.138 ms instead of 3820.633 ms.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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