diff options
| author | Adam Litke <agl@us.ibm.com> | 2007-06-16 10:16:15 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-08-04 09:10:24 -0700 |
| commit | c1228d7339dff95df5ea093f174372be5c1268b7 (patch) | |
| tree | 942d5784436eeff5101de0078ab0d672eb5e0653 /ipc | |
| parent | 4d332408463281e849c380a5505cf07bdd710419 (diff) | |
hugetlb: fix get_policy for stacked shared memory files
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 <agl@us.ibm.com>
Acked-by: William Irwin <bill.irwin@oracle.com>
Cc: dean gaudet <dean@arctic.org>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/shm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index 4fefbad7096d..8d2672d20ceb 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -254,8 +254,10 @@ struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr) 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 |