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| author | Christoph Lameter <clameter@sgi.com> | 2007-10-16 01:26:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:01 -0700 |
| commit | 42a9fdbb12ac6c027b4b91ab9b5a60aa3a834489 (patch) | |
| tree | d319573849af86fa405b93e5b93add0d34305db7 /mm/page_io.c | |
| parent | 4c93c355d5d563f300df7e61ef753d7a064411e9 (diff) | |
| download | kernel_samsung_smdk4412-42a9fdbb12ac6c027b4b91ab9b5a60aa3a834489.zip kernel_samsung_smdk4412-42a9fdbb12ac6c027b4b91ab9b5a60aa3a834489.tar.gz kernel_samsung_smdk4412-42a9fdbb12ac6c027b4b91ab9b5a60aa3a834489.tar.bz2 | |
SLUB: Optimize cacheline use for zeroing
We touch a cacheline in the kmem_cache structure for zeroing to get the
size. However, the hot paths in slab_alloc and slab_free do not reference
any other fields in kmem_cache, so we may have to just bring in the
cacheline for this one access.
Add a new field to kmem_cache_cpu that contains the object size. That
cacheline must already be used in the hotpaths. So we save one cacheline
on every slab_alloc if we zero.
We need to update the kmem_cache_cpu object size if an aliasing operation
changes the objsize of an non debug slab.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_io.c')
0 files changed, 0 insertions, 0 deletions