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| author | Theodore Ts'o <tytso@mit.edu> | 2013-03-02 16:27:46 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-03-02 16:27:46 +0100 |
| commit | 1ac6466f253ef7bd063b7877fb056afe1820841c (patch) | |
| tree | 8202e2ba849b72236ea186cfbfd4c4098aa7d699 /fs/ext4/super.c | |
| parent | ext4: optimize ext4_es_shrink() (diff) | |
| download | linux-1ac6466f253ef7bd063b7877fb056afe1820841c.tar.xz linux-1ac6466f253ef7bd063b7877fb056afe1820841c.zip | |
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.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 373d46cd5d3f..1ae5860b30a3 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: |