From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
[Andrew: since this is a regression and a very simple fix
could you still consider it for .39? Thanks]
dde79e005a769 added a regression that the memory cgroup data structures
all end up in node 0 because the first attempt at allocating them
would not pass in a node hint. Since the initialization runs on CPU #0
it would all end up node 0. This is a problem on large memory systems,
where node 0 would lose a lot of memory.
Change the alloc_pages_exact to alloc_pages_exact_node. This will
still fall back to other nodes if not enough memory is available.
[RED-PEN: right now it would fall back first before trying
vmalloc_node. Probably not the best strategy ... But I left it like
that for now.]
Reported-by: Doug Nelson
CC: Michal Hocko <mhocko@xxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
mm/page_cgroup.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 9905501..1f4e20f 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -134,7 +134,7 @@ static void *__init_refok alloc_page_cgroup(size_t size, int nid)
{
void *addr = NULL;
- addr = alloc_pages_exact(size, GFP_KERNEL | __GFP_NOWARN);
+ addr = alloc_pages_exact_node(nid, size, GFP_KERNEL | __GFP_NOWARN);
if (addr)
return addr;
--
1.7.4.4
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