[PATCH] memory cgroup enhancements take 4 [4/8] remember "a page is on active list of cgroup or not"

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Remember page_cgroup is on active_list or not in page_cgroup->flags.

Against 2.6.23-mm1.

Changelog v2->v3
  - renamed #define PCGF_ACTIVE to PAGE_CGROUP_FLAG_ACTIVE.
Changelog v1->v2
  - moved #define to out-side of struct definition

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>

 mm/memcontrol.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Index: devel-2.6.23-mm1/mm/memcontrol.c
===================================================================
--- devel-2.6.23-mm1.orig/mm/memcontrol.c
+++ devel-2.6.23-mm1/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, str
 
 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)
@@ -425,7 +429,7 @@ noreclaim:
 	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;
 	if (page_cgroup_assign_new_page_cgroup(page, pc)) {

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