linux-kernel - [PATCH] on memoryless node, /proc/pagetypeinfo is displayed slightly funny output.

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Message-Id: <20080429162859.3540.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue, 29 Apr 2008 16:40:02 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH] on memoryless node, /proc/pagetypeinfo is displayed slightly funny output.

Hi Mel,

I make patch of solve trivial pagetypeinfo problem.
please review it.


=================================================================
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@...fujitsu.com>
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC: Mel Gorman <mel@....ul.ie>

---
 mm/vmstat.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: b/mm/vmstat.c
===================================================================
--- a/mm/vmstat.c       2008-04-29 16:48:58.000000000 +0900
+++ b/mm/vmstat.c       2008-04-29 16:58:33.000000000 +0900
@@ -638,6 +638,10 @@ static int pagetypeinfo_show(struct seq_
 {
        pg_data_t *pgdat = (pg_data_t *)arg;

+       /* check memoryless ndoe*/
+       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');



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