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slub: use free_page instead of put_page for freeing kmalloc allocation

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When freeing objects, the slub allocator will most of the time free
empty pages by calling __free_pages(). But high-order kmalloc will be
diposed by means of put_page() instead. It makes no sense to call
put_page() in kernel pages that are provided by the object allocators,
so we shouldn't be doing this ourselves. Aside from the consistency
change, we don't change the flow too much. put_page()'s would call its
dtor function, which is __free_pages. We also already do all of the
Compound page tests ourselves, and the Mlock test we lose don't really
matter.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Acked-by: Christoph Lameter <cl@linux.com>
CC: David Rientjes <rientjes@google.com>
CC: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Glauber Costa 2012-08-03 22:51:37 +04:00 committed by Pekka Enberg
parent 0d7614f09c
commit d9b7f22623
1 changed files with 1 additions and 1 deletions
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2
mm/slub.c
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@ -3477,7 +3477,7 @@ void kfree(const void *x)
if (unlikely(!PageSlab(page))) {
BUG_ON(!PageCompound(page));
kmemleak_free(x);
put_page(page);
__free_pages(page, compound_order(page));
return;
}
slab_free(page->slab, page, object, _RET_IP_);