From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 6 Sep 2012 10:01:51 +0000 (-0600)
Subject: Btrfs: use a slab for ordered extents allocation
X-Git-Tag: v3.7-rc1~71^2~74
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6352b91da1a2108bb8cc5115e8714f90d706f15f;p=pandora-kernel.git

Btrfs: use a slab for ordered extents allocation

The ordered extent allocation is in the fast path of the IO, so use a slab
to improve the speed of the allocation.

 "Size of the struct is 280, so this will fall into the size-512 bucket,
  giving 8 objects per page, while own slab will pack 14 objects into a page.

  Another benefit I see is to check for leaked objects when the module is
  removed (and the cache destroy takes place)."
						-- David Sterba

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
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