Commit e2ecc8a7 authored Jul 28, 2016 by Mel Gorman Committed by Linus Torvalds Jul 28, 2016

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

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.

Link: http://lkml.kernel.org/r/1467970510-21195-34-git-send-email-mgorman@techsingularity.net


Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 7cc30fcf

mm/vmstat.c

+24 −0

Original line number	Diff line number	Diff line
		@@ -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"