diff options
| author | Joonsoo Kim <iamjoonsoo.kim@lge.com> | 2014-12-11 02:42:18 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-11 04:41:04 +0300 |
| commit | 5436205738b6f96b685ffdf3488772a1c4b152db (patch) | |
| tree | 21f097275ee0a65b10b5b4306446171fced0a3e6 /mm/slab_common.c | |
| parent | 1df3b26f201f7f08852c14596bc3ee6ba1826f11 (diff) | |
| download | linux-5436205738b6f96b685ffdf3488772a1c4b152db.tar.xz | |
mm/slab: reverse iteration on find_mergeable()
Unlike SLUB, sometimes, object isn't started at the beginning of the slab
in the SLAB. This causes the unalignment problem when after slab merging
is supported by commit 12220dea07f1 ("mm/slab: support slab merge").
Alignment mismatch check is introduced ("mm/slab: fix unalignment problem
on Malta with EVA due to slab merge") to prevent merge in this case.
This causes undesirable result that merging happens between infrequently
used kmem_caches if there are kmem_caches with same size and is 256 bytes,
are merged into pool_workqueue rather than kmalloc-256, because
kmem_caches for kmalloc are at the tail of the list.
To prevent this situation, this patch reverses iteration order in
find_mergeable() to find frequently used kmem_caches. This change helps
to merge kmem_cache to frequently used kmem_caches, such as kmalloc
kmem_caches.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab_common.c')
| -rw-r--r-- | mm/slab_common.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c index 06aeaf091f21..2a3f5ff410cf 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -240,7 +240,7 @@ struct kmem_cache *find_mergeable(size_t size, size_t align, size = ALIGN(size, align); flags = kmem_cache_flags(size, flags, name, NULL); - list_for_each_entry(s, &slab_caches, list) { + list_for_each_entry_reverse(s, &slab_caches, list) { if (slab_unmergeable(s)) continue; |