commit 3eae90c3cdd4e762d0f4f5e939c98780fccded57
author KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Tue Apr 29 01:00:22 2008 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Tue Apr 29 08:06:10 2008 -0700
tree d5b6f138e8464827b7b882fc6acea3916aca8957
parent 29f2a4dac856e9433a502b05b40e8e90385d8e27

memcg: remove redundant function calls

remove_list/add_list uses page_cgroup_zoneinfo() in it.

So, it's called twice before and after lock.

	mz = page_cgroup_zoneinfo();
	lock();
	mz = page_cgroup_zoneinfo();
	....
	unlock();

And address of mz never changes.

This is not good. This patch fixes this behavior.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f891876..395fd8e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -275,10 +275,10 @@
 	bit_spin_unlock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
 }
 
-static void __mem_cgroup_remove_list(struct page_cgroup *pc)
+static void __mem_cgroup_remove_list(struct mem_cgroup_per_zone *mz,
+			struct page_cgroup *pc)
 {
 	int from = pc->flags & PAGE_CGROUP_FLAG_ACTIVE;
-	struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc);
 
 	if (from)
 		MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE) -= 1;
@@ -289,10 +289,10 @@
 	list_del_init(&pc->lru);
 }
 
-static void __mem_cgroup_add_list(struct page_cgroup *pc)
+static void __mem_cgroup_add_list(struct mem_cgroup_per_zone *mz,
+				struct page_cgroup *pc)
 {
 	int to = pc->flags & PAGE_CGROUP_FLAG_ACTIVE;
-	struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc);
 
 	if (!to) {
 		MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE) += 1;
@@ -618,7 +618,7 @@
 
 	mz = page_cgroup_zoneinfo(pc);
 	spin_lock_irqsave(&mz->lru_lock, flags);
-	__mem_cgroup_add_list(pc);
+	__mem_cgroup_add_list(mz, pc);
 	spin_unlock_irqrestore(&mz->lru_lock, flags);
 
 	unlock_page_cgroup(page);
@@ -674,7 +674,7 @@
 	if (--(pc->ref_cnt) == 0) {
 		mz = page_cgroup_zoneinfo(pc);
 		spin_lock_irqsave(&mz->lru_lock, flags);
-		__mem_cgroup_remove_list(pc);
+		__mem_cgroup_remove_list(mz, pc);
 		spin_unlock_irqrestore(&mz->lru_lock, flags);
 
 		page_assign_page_cgroup(page, NULL);
@@ -736,7 +736,7 @@
 
 	mz = page_cgroup_zoneinfo(pc);
 	spin_lock_irqsave(&mz->lru_lock, flags);
-	__mem_cgroup_remove_list(pc);
+	__mem_cgroup_remove_list(mz, pc);
 	spin_unlock_irqrestore(&mz->lru_lock, flags);
 
 	page_assign_page_cgroup(page, NULL);
@@ -748,7 +748,7 @@
 
 	mz = page_cgroup_zoneinfo(pc);
 	spin_lock_irqsave(&mz->lru_lock, flags);
-	__mem_cgroup_add_list(pc);
+	__mem_cgroup_add_list(mz, pc);
 	spin_unlock_irqrestore(&mz->lru_lock, flags);
 
 	unlock_page_cgroup(newpage);