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authorTheodore Ts'o <tytso@mit.edu>2013-02-28 23:58:56 -0500
committerTheodore Ts'o <tytso@mit.edu>2013-02-28 23:58:56 -0500
commit246307745c406379996e6ed6411f0e20f1ce1449 (patch)
tree71b78d765ba7406c6755cad807944da6a99e5980 /fs/ext4/ext4.h
parent8e919d13048cd5acaadb2b15b48acbfb8832d3c2 (diff)
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ext4: optimize ext4_es_shrink()
When the system is under memory pressure, ext4_es_srhink() will get called very often. So optimize returning the number of items in the file system's extent status cache by keeping a per-filesystem count, instead of calculating it each time by scanning all of the inodes in the extent status cache. Also rename the slab used for the extent status cache to be "ext4_extent_status" so it's obviousl the slab in question is created by ext4. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Zheng Liu <gnehzuil.liu@gmail.com>
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r--fs/ext4/ext4.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 6e16c18..96c1093 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1268,6 +1268,7 @@ 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;
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