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| author |   Pekka J Enberg <penberg@cs.helsinki.fi> | 2009-01-07 18:07:19 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 08:31:00 -0800 |
| commit | 18a82eb9f980b5e02cea651e4ecda26265d98933 (patch) | |
| tree | 7626c16d880eed47f0eaf323f8e8e9441c84d357 /fs/ext2/ext2.h | |
| parent | ext2: fix ext2_splice_branch() comments (diff) | |
| download | linux-dev-18a82eb9f980b5e02cea651e4ecda26265d98933.tar.xz linux-dev-18a82eb9f980b5e02cea651e4ecda26265d98933.zip | |
ext2: allocate ->s_blockgroup_lock separately
As spotted by kmemtrace, struct ext2_sb_info is 17024 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 ext2_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.
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: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext2/ext2.h')
0 files changed, 0 insertions, 0 deletions