[Devel] Re: [PATCH][for -mm] per-zone and reclaim enhancements for memory controller take 3 [3/10] per-zone active inactive counter

[KAMEZAWA Hiroyuki]

On Thu, 29 Nov 2007 10:37:02 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com> wrote:

> Maybe zonelists of NODE_DATA() is not initialized. you are right.
> I think N_HIGH_MEMORY will be suitable here...(I'll consider node-hotplug case later.)
> 
> Thank you for test!
> 
Could you try this ? 

Thanks,
-Kame
==

Don't call kmalloc() against possible but offline node.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>

 mm/memcontrol.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

Index: test-2.6.24-rc3-mm1/mm/memcontrol.c
===================================================================
--- test-2.6.24-rc3-mm1.orig/mm/memcontrol.c
+++ test-2.6.24-rc3-mm1/mm/memcontrol.c
@@ -1117,8 +1117,14 @@ static int alloc_mem_cgroup_per_zone_inf
 	struct mem_cgroup_per_node *pn;
 	struct mem_cgroup_per_zone *mz;
 	int zone;
-
-	pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
+	/*
+	 * This routine is called against possible nodes.
+	 * But it's BUG to call kmalloc() against offline node.
+	 */
+	if (node_state(N_ONLINE, node))
+		pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
+	else
+		pn = kmalloc(sizeof(*pn), GFP_KERNEL);
 	if (!pn)
 		return 1;
 

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