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mm/vmstat.c: do not show lowmem reserve protection information of empty zone 

Because the lowmem reserve protection of a zone can't tell anything if the
zone is empty, except of adding one more line in /proc/zoneinfo.

Let's remove it from that zone's showing.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200402140113.3696-4-bhe@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Baoquan He 2020-06-03 15:58:55 -07:00 committed by Linus Torvalds
parent f63661566f
commit 26e7deadaa
1 changed files with 6 additions and 6 deletions
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12
mm/vmstat.c
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@ -1592,6 +1592,12 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
zone->present_pages,
zone_managed_pages(zone));
/* If unpopulated, no other information is useful */
if (!populated_zone(zone)) {
seq_putc(m, '\n');
return;
}
seq_printf(m,
"\n protection: (%ld",
zone->lowmem_reserve[0]);
@ -1599,12 +1605,6 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
seq_printf(m, ", %ld", zone->lowmem_reserve[i]);
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", zone_stat_name(i),
zone_page_state(zone, i));