The commit is pushed to "branch-rh7-3.10.0-123.1.2-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-123.1.2.vz7.5.1
------>
commit e4ba5fef962e96b36f0672ef239b5ec56cc8821a
Author: Vladimir Davydov <[email protected]>
Date: Mon May 18 17:09:37 2015 +0400
mm/vmalloc: do not account vmap_area to memcg
To avoid frequent TLB flushes, vmap_area structs are freed lazily, in
batches, once there are enough of them hanging around. As a result,
accounting them to a memcg pins the memcg itself and its kmem caches for
indefinitely long, which is not good. To avoid this, this patch makes
allocations of vmap_area's go through the root cgroup. Since they are
small and there cannot be many of them, not accounting them to memcg
won't open any security holes.
Signed-off-by: Vladimir Davydov <[email protected]>
---
mm/vmalloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 06a4446..ac32dca 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -357,7 +357,7 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
BUG_ON(!is_power_of_2(align));
va = kmalloc_node(sizeof(struct vmap_area),
- gfp_mask & GFP_RECLAIM_MASK, node);
+ (gfp_mask & GFP_RECLAIM_MASK) | __GFP_NOACCOUNT, node);
if (unlikely(!va))
return ERR_PTR(-ENOMEM);
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