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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2014-12-11 02:42:18 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 04:41:04 +0300
commit5436205738b6f96b685ffdf3488772a1c4b152db (patch)
tree21f097275ee0a65b10b5b4306446171fced0a3e6 /mm/slab_common.c
parent1df3b26f201f7f08852c14596bc3ee6ba1826f11 (diff)
downloadlinux-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.c2
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;