/proc/pagetypeinfo: fix output for memoryless nodes
on memoryless node, /proc/pagetypeinfo is displayed slightly funny output.
this patch fix it.
output example (header is outputed, but no data is outputed)
--------------------------------------------------------------
Page block order: 14
Pages per block: 16384
Free pages count per migrate type at order 0 1 2 3 4 5 \
6 7 8 9 10 11 12 13 14 15 16
Number of blocks type Unmovable Reclaimable Movable Reserve Isolate
Page block order: 14
Pages per block: 16384
Free pages count per migrate type at order 0 1 2 3 4 5 \
6 7 8 9 10 11 12 13 14 15 16
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/vmstat.c b/mm/vmstat.c
index ec6035e..280a7ed 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -548,6 +548,10 @@
{
pg_data_t *pgdat = (pg_data_t *)arg;
+ /* check memoryless node */
+ if (!node_state(pgdat->node_id, N_HIGH_MEMORY))
+ return 0;
+
seq_printf(m, "Page block order: %d\n", pageblock_order);
seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages);
seq_putc(m, '\n');
