diff options
| author | Pekka Enberg <penberg@cs.helsinki.fi> | 2009-02-16 00:07:52 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-02-16 00:07:52 +0100 |
| commit | 705895b61133ef43d106fe6a6bbdb2eec923867e (patch) | |
| tree | ea05232098c0425fda052240a8bb0e6218bb5e82 /ipc | |
| parent | ext4: New rec_len encoding for very large blocksizes (diff) | |
| download | linux-705895b61133ef43d106fe6a6bbdb2eec923867e.tar.xz linux-705895b61133ef43d106fe6a6bbdb2eec923867e.zip | |
ext4: allocate ->s_blockgroup_lock separately
As spotted by kmemtrace, struct ext4_sb_info is 17664 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 ext4_sb_info
enough to fit a 2 KB slab cache so now we allocate 16 KB + 2 KB instead of
32 KB saving 14 KB of memory.
Acked-by: Andreas Dilger <adilger@sun.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'ipc')
0 files changed, 0 insertions, 0 deletions