memcg: add hints for branch
Showing brach direction for obvious conditions.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Cc: Paul Menage <menage@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f46b861..04ded27 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -550,7 +550,7 @@
* The page_cgroup exists and
* the page has already been accounted.
*/
- if (pc) {
+ if (unlikely(pc)) {
VM_BUG_ON(pc->page != page);
VM_BUG_ON(!pc->mem_cgroup);
unlock_page_cgroup(page);
@@ -559,7 +559,7 @@
unlock_page_cgroup(page);
pc = kmem_cache_alloc(page_cgroup_cache, gfp_mask);
- if (pc == NULL)
+ if (unlikely(pc == NULL))
goto err;
/*
@@ -616,7 +616,7 @@
pc->flags = PAGE_CGROUP_FLAG_ACTIVE;
lock_page_cgroup(page);
- if (page_get_page_cgroup(page)) {
+ if (unlikely(page_get_page_cgroup(page))) {
unlock_page_cgroup(page);
/*
* Another charge has been added to this page already.
@@ -690,7 +690,7 @@
*/
lock_page_cgroup(page);
pc = page_get_page_cgroup(page);
- if (!pc)
+ if (unlikely(!pc))
goto unlock;
VM_BUG_ON(pc->page != page);
