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authorTheodore Ts'o <tytso@mit.edu>2013-03-02 10:27:46 -0500
committerTheodore Ts'o <tytso@mit.edu>2013-03-02 10:27:46 -0500
commit1ac6466f253ef7bd063b7877fb056afe1820841c (patch)
tree8202e2ba849b72236ea186cfbfd4c4098aa7d699 /fs/ext4/super.c
parent246307745c406379996e6ed6411f0e20f1ce1449 (diff)
downloadop-kernel-dev-1ac6466f253ef7bd063b7877fb056afe1820841c.zip
op-kernel-dev-1ac6466f253ef7bd063b7877fb056afe1820841c.tar.gz
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>
Diffstat (limited to 'fs/ext4/super.c')
-rw-r--r--fs/ext4/super.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 373d46c..1ae5860 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -783,6 +783,7 @@ static void ext4_put_super(struct super_block *sb)
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);
percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
+ percpu_counter_destroy(&sbi->s_extent_cache_cnt);
brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
for (i = 0; i < MAXQUOTAS; i++)
@@ -3688,6 +3689,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
if (!err) {
err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
}
+ if (!err) {
+ err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
+ }
if (err) {
ext4_msg(sb, KERN_ERR, "insufficient memory");
goto failed_mount3;
@@ -3993,6 +3997,7 @@ failed_mount3:
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);
percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
+ percpu_counter_destroy(&sbi->s_extent_cache_cnt);
if (sbi->s_mmp_tsk)
kthread_stop(sbi->s_mmp_tsk);
failed_mount2:
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