linux-kernel - [PATCH] fix OOM killing processes wrongly thought MPOL

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Message-ID: <Pine.LNX.4.64.0704182022440.11100@blonde.wat.veritas.com>
Date:	Wed, 18 Apr 2007 20:35:22 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <clameter@...r.sgi.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] fix OOM killing processes wrongly thought MPOL_BIND

I only have CONFIG_NUMA=y for build testing: surprised when trying a memhog
to see lots of other processes killed with "No available memory (MPOL_BIND)".
memhog is killed correctly once we initialize nodemask in constrained_alloc().

Signed-off-by: Hugh Dickins <hugh@...itas.com>
---
Perhaps appropriate for 2.6.20-stable too - regression since 2.6.19.

 mm/oom_kill.c |    2 ++
 1 file changed, 2 insertions(+)

--- 2.6.21-rc7/mm/oom_kill.c	2007-03-26 07:30:54.000000000 +0100
+++ linux/mm/oom_kill.c	2007-04-18 20:18:21.000000000 +0100
@@ -176,6 +176,8 @@ static inline int constrained_alloc(stru
 	struct zone **z;
 	nodemask_t nodes;
 	int node;
+
+	nodes_clear(nodes);
 	/* node has memory ? */
 	for_each_online_node(node)
 		if (NODE_DATA(node)->node_present_pages)
-
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