Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit b9982f8d authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds
Browse files

mm: memcontrol: micro-optimize mem_cgroup_split_huge_fixup() 



Don't call lookup_page_cgroup() when memcg is disabled.

Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8c0145b6

mm/memcontrol.c

+3 −1
Original line number Diff line number Diff line
@@ -3174,7 +3174,7 @@ static inline void memcg_unregister_all_caches(struct mem_cgroup *memcg) 
 */

void mem_cgroup_split_huge_fixup(struct page *head)

{

	struct page_cgroup *head_pc = lookup_page_cgroup(head);

	struct page_cgroup *head_pc;

	struct page_cgroup *pc;

	struct mem_cgroup *memcg;

	int i;
@@ -3182,6 +3182,8 @@ void mem_cgroup_split_huge_fixup(struct page *head) 
	if (mem_cgroup_disabled())

		return;



	head_pc = lookup_page_cgroup(head);



	memcg = head_pc->mem_cgroup;

	for (i = 1; i < HPAGE_PMD_NR; i++) {

		pc = head_pc + i;