From: Magnus Damm <magnus@valinux.co.jp>
Date: Wed, 26 Oct 2005 08:58:59 +0000 (-0700)
Subject: [PATCH] NUMA: broken per cpu pageset counters
X-Git-Tag: v2.6.14~16
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c6fe9465941df04a1ad8f009bd6d95b20072a58;p=linux-2.6

[PATCH] NUMA: broken per cpu pageset counters

The NUMA counters in struct per_cpu_pageset (linux/mmzone.h) are never
cleared today.  This works ok for CPU 0 on NUMA machines because
boot_pageset[] is already zero, but for other CPU:s this results in
uninitialized counters.

Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cc1fe2672a..e1d3d77f4a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1750,6 +1750,8 @@ inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
 {
 	struct per_cpu_pages *pcp;
 
+	memset(p, 0, sizeof(*p));
+
 	pcp = &p->pcp[0];		/* hot */
 	pcp->count = 0;
 	pcp->low = 2 * batch;