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authorDavid Rientjes <rientjes@google.com>2017-05-03 14:53:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:08 -0700
commit7dfb8bf3b9caef4049bee51d2c22e1c3a311d483 (patch)
treeb6ce83d81a65b27fb111a017a80b4376e9727c14 /mm/vmstat.c
parentb2bd8598195f1b2a72130592125ac6b4218988a2 (diff)
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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>
Diffstat (limited to 'mm/vmstat.c')
-rw-r--r--mm/vmstat.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c
index a828b17ced1a..f5fa1bd1eb16 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -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;