memory cgroup enhancements: remember "a page is on active list of cgr…

…oup or not" Remember page_cgroup is on active_list or not in page_cgroup->flags. Signed-off-by: KAMEZAWA Hiroyuki <[email protected]> Signed-off-by: YAMAMOTO Takashi <[email protected]> Cc: Balbir Singh <[email protected]> Cc: Pavel Emelianov <[email protected]> Cc: Paul Menage <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: "Eric W. Biederman" <[email protected]> Cc: Nick Piggin <[email protected]> Cc: Kirill Korotaev <[email protected]> Cc: Herbert Poetzl <[email protected]> Cc: David Rientjes <[email protected]> Cc: Vaidyanathan Srinivasan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
ambv · Feb 7, 2008 · 3564c7c · 3564c7c
1 parent 8236955
commit 3564c7c
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
@@ -86,6 +86,7 @@ struct page_cgroup {
 	int	 flags;
 };
 #define PAGE_CGROUP_FLAG_CACHE	(0x1)	/* charged as cache */
+#define PAGE_CGROUP_FLAG_ACTIVE (0x2)	/* page is active in this cgroup */
 
 enum {
 	MEM_CGROUP_TYPE_UNSPEC = 0,
@@ -213,10 +214,13 @@ clear_page_cgroup(struct page *page, struct page_cgroup *pc)
 
 static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
 {
-	if (active)
+	if (active) {
+		pc->flags |= PAGE_CGROUP_FLAG_ACTIVE;
 		list_move(&pc->lru, &pc->mem_cgroup->active_list);
-	else
+	} else {
+		pc->flags &= ~PAGE_CGROUP_FLAG_ACTIVE;
 		list_move(&pc->lru, &pc->mem_cgroup->inactive_list);
+	}
 }
 
 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
@@ -403,7 +407,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
 	atomic_set(&pc->ref_cnt, 1);
 	pc->mem_cgroup = mem;
 	pc->page = page;
-	pc->flags = 0;
+	pc->flags = PAGE_CGROUP_FLAG_ACTIVE;
 	if (ctype == MEM_CGROUP_CHARGE_TYPE_CACHE)
 		pc->flags |= PAGE_CGROUP_FLAG_CACHE;