| commit | 83b7b44e1c1e9e493ccd4146558481ab5af0116a | |
| author | Eric Dumazet <dada1@cosmosbay.com> | |
| Thu, 7 Dec 2006 04:38:53 +0000 (6 20:38 -0800) | ||
| committer | Linus Torvalds <torvalds@woody.osdl.org> | |
| Thu, 7 Dec 2006 16:39:41 +0000 (7 08:39 -0800) | ||
| tree | 8da0b4d9601d27073b14964fd43f64bb73540e22 | treesnapshot (tar.gz zip) |
| parent | ea82c74093f48b28e632d03eeff22faf99727a8c | commitdiff |
[PATCH] fs: reorder some 'struct inode' fields to speedup i_size manipulations
On 32bits SMP platforms, 64bits i_size is protected by a seqcount
(i_size_seqcount).
When i_size is read or written, i_size_seqcount is read/written as well, so
it make sense to group these two fields together in the same cache line.
This patch moves i_size_seqcount next to i_size, and also moves i_version
to let offsetof(struct inode, i_size) being 0x40 instead of 0x3c (for
32bits platforms).
For 64 bits platforms, i_size_seqcount doesnt exist, and the move of a
'long i_version' should not introduce a new hole because of padding.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
On 32bits SMP platforms, 64bits i_size is protected by a seqcount
(i_size_seqcount).
When i_size is read or written, i_size_seqcount is read/written as well, so
it make sense to group these two fields together in the same cache line.
This patch moves i_size_seqcount next to i_size, and also moves i_version
to let offsetof(struct inode, i_size) being 0x40 instead of 0x3c (for
32bits platforms).
For 64 bits platforms, i_size_seqcount doesnt exist, and the move of a
'long i_version' should not introduce a new hole because of padding.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| include/linux/fs.h | diffblobblamehistory |