The patch titled
Subject: slub: reduce duplicate creation on the first object
has been added to the -mm tree. Its filename is
slub-reduce-duplicate-creation-on-the-first-object.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/slub-reduce-duplicate-creation-on-the-first-object.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/slub-reduce-duplicate-creation-on-the-first-object.patch
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------------------------------------------------------
From: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx>
Subject: slub: reduce duplicate creation on the first object
When a kmem_cache is created with ctor, each object in the kmem_cache will
be initialized before use. In the slub implementation, the first object
will be initialized twice.
This patch avoids the duplication of initialization of the first object.
Fixes commit 7656c72b5a63: ("SLUB: add macros for scanning objects in a
slab").
Signed-off-by: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/slub.c~slub-reduce-duplicate-creation-on-the-first-object mm/slub.c
--- a/mm/slub.c~slub-reduce-duplicate-creation-on-the-first-object
+++ a/mm/slub.c
@@ -1403,7 +1403,7 @@ static struct page *new_slab(struct kmem
memset(start, POISON_INUSE, PAGE_SIZE << order);
last = start;
- for_each_object(p, s, start, page->objects) {
+ for_each_object(p, s, start + s->size, page->objects - 1) {
setup_object(s, page, last);
set_freepointer(s, last, p);
last = p;
_
Patches currently in -mm which might be from weiyang@xxxxxxxxxxxxxxxxxx are
slub-reduce-duplicate-creation-on-the-first-object.patch
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