ext4: use percpu counter for extent cache count
authorTheodore Ts'o <tytso@mit.edu>
Sat, 2 Mar 2013 15:27:46 +0000 (10:27 -0500)
committerTheodore Ts'o <tytso@mit.edu>
Sat, 2 Mar 2013 15:27:46 +0000 (10:27 -0500)
commit1ac6466f253ef7bd063b7877fb056afe1820841c
tree8202e2ba849b72236ea186cfbfd4c4098aa7d699
parent246307745c406379996e6ed6411f0e20f1ce1449
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>
fs/ext4/ext4.h
fs/ext4/extents_status.c
fs/ext4/super.c