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SubjectRe: 2.6.24-rc3-mm2 (bugfix for memory cgroup per-zone-struct allocation.)
On Thu, 29 Nov 2007 12:23:29 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> I noticed CONFIG_NUMA + CONFIG_CGROUP_MEM_CONT + CONFIG_SLUB cannot boot because of my patch.
> (SLAB is ok.)
> I'll post workaround soon.
>
==
This is a fix. tested on my ia64/NUMA box both on SLAB/SLUB.
This patch fixes kmalloc_node() is called against node-without-memory.

It's better to add memory hotplug callback for supporing possible nodes
(memory hotplug) but here just uses kmalloc().

Should be revisited later.

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

mm/memcontrol.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
Index: linux-2.6.24-rc3-mm2/mm/memcontrol.c
===================================================================
--- linux-2.6.24-rc3-mm2.orig/mm/memcontrol.c
+++ linux-2.6.24-rc3-mm2/mm/memcontrol.c
@@ -1117,8 +1117,18 @@ 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.
+ *
+ * TODO: this routine can waste much memory for nodes which will
+ * never be onlined. It's better to use memory hotplug callback
+ * function.
+ */
+ if (node_state(node, N_HIGH_MEMORY))
+ pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
+ else
+ pn = kmalloc(sizeof(*pn), GFP_KERNEL);
if (!pn)
return 1;

-
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