-stable review patch. If anyone has any objections, please let us know.
------------------
From: Adam Litke <[email protected]>
Here's another breakage as a result of shared memory stacked files :(
The NUMA policy for a VMA is determined by checking the following (in the
order given):
1) vma->vm_ops->get_policy() (if defined)
2) vma->vm_policy (if defined)
3) task->mempolicy (if defined)
4) Fall back to default_policy
By switching to stacked files for shared memory, get_policy() is now always
set to shm_get_policy which is a wrapper function. This causes us to stop
at step 1, which yields NULL for hugetlb instead of task->mempolicy which
was the previous (and correct) result.
This patch modifies the shm_get_policy() wrapper to maintain steps 1-3 for
the wrapped vm_ops.
(akpm: the refcounting of mempolicies is busted and this patch does nothing to
improve it)
Signed-off-by: Adam Litke <[email protected]>
Acked-by: William Irwin <[email protected]>
Cc: dean gaudet <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
ipc/shm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- linux-2.6.21.6.orig/ipc/shm.c
+++ linux-2.6.21.6/ipc/shm.c
@@ -254,8 +254,10 @@ struct mempolicy *shm_get_policy(struct
if (sfd->vm_ops->get_policy)
pol = sfd->vm_ops->get_policy(vma, addr);
- else
+ else if (vma->vm_policy)
pol = vma->vm_policy;
+ else
+ pol = current->mempolicy;
return pol;
}
#endif
--
-
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