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| author | Richard Kennedy <richard@rsk.demon.co.uk> | 2010-03-11 00:20:33 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-13 00:52:27 +0100 |
| commit | 019b4d123aa7b9fc135b532e021cfde85db7665d (patch) | |
| tree | 91edbae535136417bc1277dd2c40d98c7ea7ec8f /drivers/rtc | |
| parent | fs/ocfs2/cluster/tcp.c: remove use of NIPQUAD, use %pI4 (diff) | |
| download | linux-019b4d123aa7b9fc135b532e021cfde85db7665d.tar.xz linux-019b4d123aa7b9fc135b532e021cfde85db7665d.zip | |
fs: buffer_head: remove kmem_cache constructor to reduce memory usage under slub
When using slub, having a kmem_cache constructor forces slub to add a free
pointer to the size of the cached object, which can have a significant
impact to the number of small objects that can fit into a slab.
As buffer_head is relatively small and we can have large numbers of them,
removing the constructor is a definite win.
On x86_64 removing the constructor gives me 39 objects/slab, 3 more than
without the patch. And on x86_32 73 objects/slab, which is 9 more.
As alloc_buffer_head() already initializes each new object there is very
little difference in actual code run.
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc')
0 files changed, 0 insertions, 0 deletions