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this_cpu: Use this_cpu ops for VM statistics
authorChristoph Lameter <cl@linux-foundation.org>
Sat, 3 Oct 2009 10:48:23 +0000 (19:48 +0900)
committerTejun Heo <tj@kernel.org>
Sat, 3 Oct 2009 10:48:23 +0000 (19:48 +0900)
Using per cpu atomics for the vm statistics reduces their overhead.
And in the case of x86 we are guaranteed that they will never race even
in the lax form used for vm statistics.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

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