This patch implements per-zone lru for memory cgroup.
This patch makes use of mem_cgroup_per_zone struct for per zone lru.

LRU can be accessed by

   mz = mem_cgroup_zoneinfo(mem_cgroup, node, zone);
   &mz->active_list
   &mz->inactive_list

   or
   mz = page_cgroup_zoneinfo(page_cgroup);
   &mz->active_list
   &mz->inactive_list

Changelog v1->v2
  - merged to mem_cgroup_per_zone struct.
  - handle page migraiton.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>


 mm/memcontrol.c |   63 ++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 39 insertions(+), 24 deletions(-)

Index: linux-2.6.24-rc3-mm1/mm/memcontrol.c
===================================================================
--- linux-2.6.24-rc3-mm1.orig/mm/memcontrol.c	2007-11-27 11:24:04.000000000 +0900
+++ linux-2.6.24-rc3-mm1/mm/memcontrol.c	2007-11-27 11:24:16.000000000 +0900
@@ -89,6 +89,8 @@
 };
 
 struct mem_cgroup_per_zone {
+	struct list_head	active_list;
+	struct list_head	inactive_list;
 	unsigned long count[NR_MEM_CGROUP_ZSTAT];
 };
 /* Macro for accessing counter */
@@ -122,10 +124,7 @@
 	/*
 	 * Per cgroup active and inactive list, similar to the
 	 * per zone LRU lists.
-	 * TODO: Consider making these lists per zone
 	 */
-	struct list_head active_list;
-	struct list_head inactive_list;
 	struct mem_cgroup_lru_info info;
 	/*
 	 * spin_lock to protect the per cgroup LRU
@@ -367,10 +366,10 @@
 
 	if (!to) {
 		MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE) += 1;
-		list_add(&pc->lru, &pc->mem_cgroup->inactive_list);
+		list_add(&pc->lru, &mz->inactive_list);
 	} else {
 		MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE) += 1;
-		list_add(&pc->lru, &pc->mem_cgroup->active_list);
+		list_add(&pc->lru, &mz->active_list);
 	}
 	mem_cgroup_charge_statistics(pc->mem_cgroup, pc->flags, true);
 }
@@ -388,11 +387,11 @@
 	if (active) {
 		MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_ACTIVE) += 1;
 		pc->flags |= PAGE_CGROUP_FLAG_ACTIVE;
-		list_move(&pc->lru, &pc->mem_cgroup->active_list);
+		list_move(&pc->lru, &mz->active_list);
 	} else {
 		MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE) += 1;
 		pc->flags &= ~PAGE_CGROUP_FLAG_ACTIVE;
-		list_move(&pc->lru, &pc->mem_cgroup->inactive_list);
+		list_move(&pc->lru, &mz->inactive_list);
 	}
 }
 
@@ -518,11 +517,16 @@
 	LIST_HEAD(pc_list);
 	struct list_head *src;
 	struct page_cgroup *pc, *tmp;
+	int nid = z->zone_pgdat->node_id;
+	int zid = zone_idx(z);
+	struct mem_cgroup_per_zone *mz;
 
+	mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
 	if (active)
-		src = &mem_cont->active_list;
+		src = &mz->active_list;
 	else
-		src = &mem_cont->inactive_list;
+		src = &mz->inactive_list;
+
 
 	spin_lock(&mem_cont->lru_lock);
 	scan = 0;
@@ -544,13 +548,6 @@
 			continue;
 		}
 
-		/*
-		 * Reclaim, per zone
-		 * TODO: make the active/inactive lists per zone
-		 */
-		if (page_zone(page) != z)
-			continue;
-
 		scan++;
 		list_move(&pc->lru, &pc_list);
 
@@ -832,6 +829,8 @@
 	int count;
 	unsigned long flags;
 
+	if (list_empty(list))
+		return;
 retry:
 	count = FORCE_UNCHARGE_BATCH;
 	spin_lock_irqsave(&mem->lru_lock, flags);
@@ -867,20 +866,27 @@
 int mem_cgroup_force_empty(struct mem_cgroup *mem)
 {
 	int ret = -EBUSY;
+	int node, zid;
 	css_get(&mem->css);
 	/*
 	 * page reclaim code (kswapd etc..) will move pages between
 `	 * active_list <-> inactive_list while we don't take a lock.
 	 * So, we have to do loop here until all lists are empty.
 	 */
-	while (!(list_empty(&mem->active_list) &&
-		 list_empty(&mem->inactive_list))) {
+	while (mem->res.usage > 0) {
 		if (atomic_read(&mem->css.cgroup->count) > 0)
 			goto out;
-		/* drop all page_cgroup in active_list */
-		mem_cgroup_force_empty_list(mem, &mem->active_list);
-		/* drop all page_cgroup in inactive_list */
-		mem_cgroup_force_empty_list(mem, &mem->inactive_list);
+		for_each_node_state(node, N_POSSIBLE)
+			for (zid = 0; zid < MAX_NR_ZONES; zid++) {
+				struct mem_cgroup_per_zone *mz;
+				mz = mem_cgroup_zoneinfo(mem, node, zid);
+				/* drop all page_cgroup in active_list */
+				mem_cgroup_force_empty_list(mem,
+							&mz->active_list);
+				/* drop all page_cgroup in inactive_list */
+				mem_cgroup_force_empty_list(mem,
+							&mz->inactive_list);
+			}
 	}
 	ret = 0;
 out:
@@ -1092,15 +1098,25 @@
 static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
 {
 	struct mem_cgroup_per_node *pn;
+	struct mem_cgroup_per_zone *mz;
+	int zone;
 
 	pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
 	if (!pn)
 		return 1;
+
 	mem->info.nodeinfo[node] = pn;
 	memset(pn, 0, sizeof(*pn));
+
+	for (zone = 0; zone < MAX_NR_ZONES; zone++) {
+		mz = &pn->zoneinfo[zone];
+		INIT_LIST_HEAD(&mz->active_list);
+		INIT_LIST_HEAD(&mz->inactive_list);
+	}
 	return 0;
 }
 
+
 static struct mem_cgroup init_mem_cgroup;
 
 static struct cgroup_subsys_state *
@@ -1119,8 +1135,7 @@
 		return NULL;
 
 	res_counter_init(&mem->res);
-	INIT_LIST_HEAD(&mem->active_list);
-	INIT_LIST_HEAD(&mem->inactive_list);
+
 	spin_lock_init(&mem->lru_lock);
 	mem->control_type = MEM_CGROUP_TYPE_ALL;
 	memset(&mem->info, 0, sizeof(mem->info));

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