[RFC PATCH 07/10] mm: Modify vmstat

["Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>]

From: Ankita Garg <gargankita@xxxxxxxxx>

Change the way vmstats are collected. Since the zones are now present inside
regions, scan through all the regions to obtain zone specific statistics.

Signed-off-by: Ankita Garg <gargankita@xxxxxxxxx>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
---

 include/linux/vmstat.h |   21 ++++++++++++++-------
 mm/vmstat.c            |   40 ++++++++++++++++++++++++----------------
 2 files changed, 38 insertions(+), 23 deletions(-)

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 92a86b2..a782f05 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -151,20 +151,27 @@ extern unsigned long zone_reclaimable_pages(struct zone *zone);
 static inline unsigned long node_page_state(int node,
 				 enum zone_stat_item item)
 {
-	struct zone *zones = NODE_DATA(node)->node_zones;
+	unsigned long page_state = 0;
+	struct mem_region *region;
+
+	for_each_mem_region_in_node(region, node) {
+		struct zone *zones = region->region_zones;
+
+		page_state =
 
-	return
 #ifdef CONFIG_ZONE_DMA
-		zone_page_state(&zones[ZONE_DMA], item) +
+			zone_page_state(&zones[ZONE_DMA], item) +
 #endif
 #ifdef CONFIG_ZONE_DMA32
-		zone_page_state(&zones[ZONE_DMA32], item) +
+			zone_page_state(&zones[ZONE_DMA32], item) +
 #endif
 #ifdef CONFIG_HIGHMEM
-		zone_page_state(&zones[ZONE_HIGHMEM], item) +
+			zone_page_state(&zones[ZONE_HIGHMEM], item) +
 #endif
-		zone_page_state(&zones[ZONE_NORMAL], item) +
-		zone_page_state(&zones[ZONE_MOVABLE], item);
+			zone_page_state(&zones[ZONE_NORMAL], item) +
+			zone_page_state(&zones[ZONE_MOVABLE], item);
+	}
+	return page_state;
 }
 
 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c737057..86a92a6 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -188,20 +188,24 @@ void refresh_zone_stat_thresholds(void)
 void set_pgdat_percpu_threshold(pg_data_t *pgdat,
 				int (*calculate_pressure)(struct zone *))
 {
+	struct mem_region *region;
 	struct zone *zone;
 	int cpu;
 	int threshold;
 	int i;
 
 	for (i = 0; i < pgdat->nr_zones; i++) {
-		zone = &pgdat->node_zones[i];
-		if (!zone->percpu_drift_mark)
-			continue;
+		for_each_mem_region_in_node(region, pgdat->node_id) {
+			struct zone *zone = region->region_zones + i;
 
-		threshold = (*calculate_pressure)(zone);
-		for_each_possible_cpu(cpu)
-			per_cpu_ptr(zone->pageset, cpu)->stat_threshold
-							= threshold;
+			if (!zone->percpu_drift_mark)
+				continue;
+
+			threshold = (*calculate_pressure)(zone);
+			for_each_possible_cpu(cpu)
+				per_cpu_ptr(zone->pageset, cpu)->stat_threshold
+								= threshold;
+		}
 	}
 }
 
@@ -657,19 +661,23 @@ static void frag_stop(struct seq_file *m, void *arg)
 
 /* Walk all the zones in a node and print using a callback */
 static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
-		void (*print)(struct seq_file *m, pg_data_t *, struct zone *))
+			       void (*print)(struct seq_file *m, pg_data_t *,
+		               struct mem_region *, struct zone *))
 {
-	struct zone *zone;
-	struct zone *node_zones = pgdat->node_zones;
+	int i;
 	unsigned long flags;
+	struct mem_region *region;
 
-	for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
-		if (!populated_zone(zone))
-			continue;
+	for (i = 0; i < MAX_NR_ZONES; ++i) {
+		for_each_mem_region_in_node(region, pgdat->node_id) {
+			struct zone *zone = region->region_zones + i;
+			if (!populated_zone(zone))
+				continue;
 
-		spin_lock_irqsave(&zone->lock, flags);
-		print(m, pgdat, zone);
-		spin_unlock_irqrestore(&zone->lock, flags);
+			spin_lock_irqsave(&zone->lock, flags);
+			print(m, pgdat, region, zone);
+			spin_unlock_irqrestore(&zone->lock, flags);
+		}
 	}
 }
 #endif

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