From: Josef Bacik <jbacik@fusionio.com>
Date: Mon, 15 Oct 2012 17:43:18 +0000 (-0400)
Subject: Btrfs: optimize leaf_space_used
X-Git-Tag: v3.8-rc1~71^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41be1f3b40b87de33cd2e7463dce88596dbdccc4;p=pandora-kernel.git

Btrfs: optimize leaf_space_used

This gets called at least 4 times for every level while adding an object,
and it involves 3 kmapping calls, which on my box take about 5us a piece.
So instead use a token, which brings us down to 1 kmap call and makes this
function take 1/3 of the time per call.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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