linux-kernel - [PATCH mmotm] Fix NUMA accounting in numastat.txt

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Message-Id: <20090901135321.f0da4715.minchan.kim@barrios-desktop>
Date:	Tue, 1 Sep 2009 13:53:21 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, lkml <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: [PATCH mmotm] Fix NUMA accounting in numastat.txt


In Documentation/numastat.txt, it confused me.
For example, there are nodes [0,1] in system.

barrios:~$ cat /proc/zoneinfo | egrep 'numa|zone'
Node 0, zone	DMA
	numa_hit	33226
	numa_miss	1739
	numa_foreign	27978
	..
	..
Node 1, zone	DMA
	numa_hit	307
	numa_miss	46900
	numa_foreign	0

1) In node 0,  NUMA_MISS means it wanted to allocate page
in node 1 but ended up with page in node 0

2) In node 0, NUMA_FOREIGN means it wanted to allocate page
in node 0 but ended up with page from Node 1.

But now, numastat explains it oppositely about (MISS, FOREIGN).
Let's fix up with viewpoint of zone. 

Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 Documentation/numastat.txt |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/numastat.txt b/Documentation/numastat.txt
index 80133ac..9fcc9a6 100644
--- a/Documentation/numastat.txt
+++ b/Documentation/numastat.txt
@@ -7,10 +7,10 @@ All units are pages. Hugepages have separate counters.

 numa_hit			A process wanted to allocate memory from this node,
 					and succeeded.
-numa_miss			A process wanted to allocate memory from this node,
-					but ended up with memory from another.
-numa_foreign		A process wanted to allocate on another node,
-				    but ended up with memory from this one.
+numa_miss			A process wanted to allocate memory from another node,
+					but ended up with memory from this node.
+numa_foreign		A process wanted to allocate on this node,
+				    but ended up with memory from another one.
 local_node			A process ran on this node and got memory from it.
 other_node			A process ran on this node and got memory from another node.
 interleave_hit 		Interleaving wanted to allocate from this node
--
1.5.4.3



-- 
Kind regards,
Minchan Kim
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