linux-kernel - [PATCH 3/5] vmevent: Refresh vmstats before sampling

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Message-Id: <1338553446-22292-3-git-send-email-anton.vorontsov@linaro.org>
Date:	Fri,  1 Jun 2012 05:24:04 -0700
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, kernel-team@...roid.com
Subject: [PATCH 3/5] vmevent: Refresh vmstats before sampling

On SMP, kernel updates vmstats only once per second, which makes vmevent
unusable. Let's fix it by updating vmstats before sampling.

Reported-by: KOSAKI Motohiro <kosaki.motohiro@...il.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
---
 mm/vmevent.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/vmevent.c b/mm/vmevent.c
index 4ca2a04..35fd0d5 100644
--- a/mm/vmevent.c
+++ b/mm/vmevent.c
@@ -2,6 +2,7 @@
 #include <linux/atomic.h>
 #include <linux/compiler.h>
 #include <linux/vmevent.h>
+#include <linux/mm.h>
 #include <linux/syscalls.h>
 #include <linux/workqueue.h>
 #include <linux/file.h>
@@ -163,6 +164,9 @@ static void vmevent_sample(struct vmevent_watch *watch)
 
 	if (atomic_read(&watch->pending))
 		return;
+
+	refresh_vm_stats();
+
 	if (!vmevent_match(watch))
 		return;
 
-- 
1.7.9.2

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