From: Andi Kleen <ak@linux.intel.com>
Date: Tue, 2 Aug 2011 04:38:06 +0000 (-0700)
Subject: direct-io: use a slab cache for struct dio
X-Git-Tag: v3.2-rc1~131^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e8267f532a17165ab551ac5fdafcba5333dcca5;p=pandora-kernel.git

direct-io: use a slab cache for struct dio

A direct slab call is slightly faster than kmalloc and can be better cached
per CPU. It also avoids rounding to the next kmalloc slab.

In addition this enforces cache line alignment for struct dio to avoid
any false sharing.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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