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ext4: use percpu counter for extent cache count

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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>
This commit is contained in:
Theodore Ts'o 2013-03-02 10:27:46 -05:00
parent 246307745c
commit 1ac6466f25
3 changed files with 10 additions and 5 deletions
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2
fs/ext4/ext4.h
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@ -1268,7 +1268,6 @@ struct ext4_sb_info {
atomic_t s_mb_preallocated;
atomic_t s_mb_discarded;
atomic_t s_lock_busy;
atomic_t s_extent_cache_cnt;
/* locality groups */
struct ext4_locality_group __percpu *s_locality_groups;
@ -1310,6 +1309,7 @@ struct ext4_sb_info {
/* Reclaim extents from extent status tree */
struct shrinker s_es_shrinker;
struct list_head s_es_lru;
struct percpu_counter s_extent_cache_cnt;
spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
};