diff options
| author | Pekka Enberg <[email protected]> | 2009-02-15 18:07:52 -0500 |
|---|---|---|
| committer | Theodore Ts'o <[email protected]> | 2009-02-15 18:07:52 -0500 |
| commit | 705895b61133ef43d106fe6a6bbdb2eec923867e (patch) | |
| tree | ea05232098c0425fda052240a8bb0e6218bb5e82 /net/lapb/lapb_subr.c | |
| parent | 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4 (diff) | |
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 <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: "Theodore Ts'o" <[email protected]>
Diffstat (limited to 'net/lapb/lapb_subr.c')
0 files changed, 0 insertions, 0 deletions