From: Chris Mason <chris.mason@fusionio.com>
Date: Mon, 23 Jul 2012 19:25:05 +0000 (-0400)
Subject: Btrfs: reduce calls to wake_up on uncontended locks
X-Git-Tag: v3.6-rc1~81^2~44
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cbea5ac1ee03197354bd38caad3fcb798f185181;p=pandora-kernel.git

Btrfs: reduce calls to wake_up on uncontended locks

The btrfs locks were unconditionally calling wake_up as the
locks were released.  This lead to extra thrashing on the waitqueue,
especially for locks that were dominated by readers.

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