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Commit 7dfb8bf3 authored by David Rientjes's avatar David Rientjes Committed by Linus Torvalds
Browse files

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: default avatarDavid 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus 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;