From: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
As spotted by kmemtrace, struct ext3_sb_info is 17152 bytes on 64-bit which
makes it a very bad fit for SLAB allocators. The culprit of the wasted memory
is ->s_blockgroup_lock which can be as big as 16 KB when NR_CPUS >= 32.
To fix that, allocate ->s_blockgroup_lock, which fits nicely in a order 2 page
in the worst case, separately. This shinks down struct ext3_sb_info enough to
fit a 1 KB slab cache so now we allocate 16 KB + 1 KB instead of 32 KB saving
15 KB of memory.
Cc: Andreas Dilger <adilger@xxxxxxx>
Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
---
fs/ext3/super.c | 10 +++++++++-
include/linux/ext3_fs_sb.h | 4 ++--
2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index f6c94f2..f41df22 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -439,6 +439,7 @@ static void ext3_put_super (struct super_block * sb)
ext3_blkdev_remove(sbi);
}
sb->s_fs_info = NULL;
+ kfree(sbi->s_blockgroup_lock);
kfree(sbi);
return;
}
@@ -1548,6 +1549,13 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
+
+ sbi->s_blockgroup_lock =
+ kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
+ if (!sbi->s_blockgroup_lock) {
+ kfree(sbi);
+ return -ENOMEM;
+ }
sb->s_fs_info = sbi;
sbi->s_mount_opt = 0;
sbi->s_resuid = EXT3_DEF_RESUID;
@@ -1788,7 +1796,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
goto failed_mount;
}
- bgl_lock_init(&sbi->s_blockgroup_lock);
+ bgl_lock_init(sbi->s_blockgroup_lock);
for (i = 0; i < db_count; i++) {
block = descriptor_loc(sb, logic_sb_block, i);
diff --git a/include/linux/ext3_fs_sb.h b/include/linux/ext3_fs_sb.h
index e024e38..76fdc0f 100644
--- a/include/linux/ext3_fs_sb.h
+++ b/include/linux/ext3_fs_sb.h
@@ -60,7 +60,7 @@ struct ext3_sb_info {
struct percpu_counter s_freeblocks_counter;
struct percpu_counter s_freeinodes_counter;
struct percpu_counter s_dirs_counter;
- struct blockgroup_lock s_blockgroup_lock;
+ struct blockgroup_lock *s_blockgroup_lock;
/* root of the per fs reservation window tree */
spinlock_t s_rsv_window_lock;
@@ -86,7 +86,7 @@ struct ext3_sb_info {
static inline spinlock_t *
sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
{
- return bgl_lock_ptr(&sbi->s_blockgroup_lock, block_group);
+ return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
}
#endif /* _LINUX_EXT3_FS_SB */
--
1.5.4.3
--
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