Commit 7dfb8bf3 authored May 03, 2017 by David Rientjes Committed by Linus Torvalds May 03, 2017

mm, vmstat: suppress pcp stats for unpopulated zones in zoneinfo

After "mm, vmstat: print non-populated zones in zoneinfo",
/proc/zoneinfo will show unpopulated zones.

The per-cpu pageset statistics are not relevant for unpopulated zones
and can be potentially lengthy, so supress them when they are not
interesting.

Also moves lowmem reserve protection information above pcp stats since
it is relevant for all zones per vm.lowmem_reserve_ratio.

Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1703061400500.46428@chino.kir.corp.google.com


Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b2bd8598

mm/vmstat.c

+13 −7

Original line number	Diff line number	Diff line
		@@ -1393,18 +1393,24 @@ static void zoneinfo_show_print(struct seq_file m, pg_data_t pgdat,
		zone->present_pages,
		zone->managed_pages);

		for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
		seq_printf(m, "\n %-12s %lu", vmstat_text[i],
		zone_page_state(zone, i));

		seq_printf(m,
		"\n protection: (%ld",
		zone->lowmem_reserve[0]);
		for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
		seq_printf(m, ", %ld", zone->lowmem_reserve[i]);
		seq_printf(m,
		")"
		"\n pagesets");
		seq_putc(m, ')');

		/* If unpopulated, no other information is useful */
		if (!populated_zone(zone)) {
		seq_putc(m, '\n');
		return;
		}

		for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
		seq_printf(m, "\n %-12s %lu", vmstat_text[i],
		zone_page_state(zone, i));

		seq_printf(m, "\n pagesets");
		for_each_online_cpu(i) {
		struct per_cpu_pageset *pageset;

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