From: Theodore Ts'o <tytso@mit.edu>
Date: Sat, 2 Mar 2013 15:27:46 +0000 (-0500)
Subject: ext4: use percpu counter for extent cache count
X-Git-Tag: v3.9-rc1~14^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ac6466f253ef7bd063b7877fb056afe1820841c;p=pandora-kernel.git

ext4: use percpu counter for extent cache count

Use a percpu counter rather than atomic types for shrinker accounting.
There's no need for ultimate accuracy in the shrinker, so this
should come a little more cheaply.  The percpu struct is somewhat
large, but there was a big gap before the cache-aligned
s_es_lru_lock anyway, and it fits nicely in there.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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