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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>
This commit is contained in:
KAMEZAWA Hiroyuki 2008-07-25 01:47:16 -07:00 committed by Linus Torvalds
parent c9b0ed5148
commit b76734e5e3
1 changed files with 4 additions and 4 deletions
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8
mm/memcontrol.c
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@ -550,7 +550,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
* 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 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
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 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
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 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
*/
lock_page_cgroup(page);
pc = page_get_page_cgroup(page);
if (!pc)
if (unlikely(!pc))
goto unlock;
VM_BUG_ON(pc->page != page);