mm, vmstat: print node-based stats in zoneinfo file

[linux-2.6-block.git] / mm / vmstat.c

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 5caaf3f7b8abca176ce0cfe8c068eb4781530eda..ac509572a50b6adebe64e611dbb8171c37858949 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1415,11 +1415,35 @@ static const struct file_operations pagetypeinfo_file_ops = {
        .release        = seq_release,
 };
 
+static bool is_zone_first_populated(pg_data_t *pgdat, struct zone *zone)
+{
+       int zid;
+
+       for (zid = 0; zid < MAX_NR_ZONES; zid++) {
+               struct zone *compare = &pgdat->node_zones[zid];
+
+               if (populated_zone(compare))
+                       return zone == compare;
+       }
+
+       /* The zone must be somewhere! */
+       WARN_ON_ONCE(1);
+       return false;
+}
+
 static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
                                                        struct zone *zone)
 {
        int i;
        seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
+       if (is_zone_first_populated(pgdat, zone)) {
+               seq_printf(m, "\n  per-node stats");
+               for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
+                       seq_printf(m, "\n      %-12s %lu",
+                               vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
+                               node_page_state(pgdat, i));
+               }
+       }
        seq_printf(m,
                   "\n  pages free     %lu"
                   "\n        min      %lu"