[3/5] mm/vmstat.c: do not show lowmem reserve protection information of empty zone

Commit Message

Baoquan He March 24, 2020, 2:22 p.m. UTC

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 <[e-mail]>
---
 mm/vmstat.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

Patch

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 96d21a792b57..6fd1407f4632 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1590,6 +1590,12 @@  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]);
@@ -1597,12 +1603,6 @@  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));