[Devel] [PATCH -mm 08/12] memcg: do not charge kmalloc_large allocations

[Vladimir Davydov]

We don't have a way to track kmalloc_large allocations so that charging
them makes kmemcg reparenting impossible. Since such allocations are
rare and can't be massively triggered from userspace, let's just ignore
them.

Cc: Johannes Weiner <hannes at cmpxchg.org>
Cc: Michal Hocko <mhocko at suse.cz>
Cc: Glauber Costa <glommer at gmail.com>
Cc: Christoph Lameter <cl at linux-foundation.org>
Cc: Pekka Enberg <penberg at kernel.org>
---
 include/linux/slab.h |    2 +-
 mm/slub.c            |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 8091d009cd72..29dbf6f2fd3a 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -364,7 +364,7 @@ kmalloc_order(size_t size, gfp_t flags, unsigned int order)
 {
 	void *ret;
 
-	flags |= (__GFP_COMP | __GFP_KMEMCG);
+	flags |= __GFP_COMP;
 	ret = (void *) __get_free_pages(flags, order);
 	kmemleak_alloc(ret, size, 1, flags);
 	return ret;
diff --git a/mm/slub.c b/mm/slub.c
index fa995823de60..d8b8659bfa64 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3332,7 +3332,7 @@ static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
 	struct page *page;
 	void *ptr = NULL;
 
-	flags |= __GFP_COMP | __GFP_NOTRACK | __GFP_KMEMCG;
+	flags |= __GFP_COMP | __GFP_NOTRACK;
 	page = alloc_pages_node(node, flags, get_order(size));
 	if (page)
 		ptr = page_address(page);
@@ -3402,7 +3402,7 @@ void kfree(const void *x)
 	if (unlikely(!PageSlab(page))) {
 		BUG_ON(!PageCompound(page));
 		kfree_hook(x);
-		__free_memcg_kmem_pages(page, compound_order(page));
+		__free_pages(page, compound_order(page));
 		return;
 	}
 	slab_free(page->slab_cache, page, object, _RET_IP_);
-- 
1.7.10.4