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Subject[PATCH 30/31] mm, vmstat: print node-based stats in zoneinfo file
Date
There are a number of stats that were previously accessible via zoneinfo
that are now invisible. While it is possible to create a new file for the
node stats, this may be missed by users. Instead this patch prints the
stats under the first populated zone in /proc/zoneinfo.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
mm/vmstat.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index b9a9844e3142..ce09be63e8c7 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1402,11 +1402,35 @@ 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"
--
2.6.4
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