Commit 26e7dead authored by Baoquan He's avatar Baoquan He Committed by Linus Torvalds

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: default avatarBaoquan He <bhe@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200402140113.3696-4-bhe@redhat.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f6366156
......@@ -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));
......
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