[PATCH] mm: vmstat.c: make extfrag_index show more pretty

[Lin Feng]

fragmentation_index may return -1000 and the corresponding formated value
showed by seq_printf will take a negative signatrue, but other positive
formated values don't take a positive signatrue, so the output becomes
unaligned.

before:
Node 0, zone      DMA -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000
Node 0, zone    DMA32 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000
Node 0, zone   Normal -1.000 -1.000 -1.000 -1.000 0.931 0.966 0.983 0.992 0.996 0.998 0.999

after this patch:
Node 0, zone      DMA -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000
Node 0, zone    DMA32 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000
Node 0, zone   Normal -1.000 -1.000 -1.000 -1.000  0.931  0.966  0.983  0.992  0.996  0.998  0.999

Signed-off-by: Lin Feng <linf@xxxxxxxxxx>
---
 mm/vmstat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 8ce2620344b2..263d367d193b 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -2179,7 +2179,7 @@ static void extfrag_show_print(struct seq_file *m,
 	for (order = 0; order < MAX_ORDER; ++order) {
 		fill_contig_page_info(zone, order, &info);
 		index = __fragmentation_index(order, &info);
-		seq_printf(m, "%d.%03d ", index / 1000, index % 1000);
+		seq_printf(m, "%2d.%03d ", index / 1000, index % 1000);
 	}
 
 	seq_putc(m, '\n');
-- 
2.31.1