Re: [shm][hugetlb] Fix get_policy for stacked shared memory files

[dean gaudet]

On Mon, 11 Jun 2007, Adam Litke wrote:

> 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.  Andi and Christoph, does this look right to you?

thanks for the patch -- seems to do the trick for me.  it seems like it 
would be a candidate for stable series as well.

-dean
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