On Mon, 11 Jun 2007 16:34:54 -0500 Adam Litke <[EMAIL PROTECTED]> 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? > Can we just double-check the refcounting please? > index 4fefbad..8d2672d 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); afacit this takes a ref on the underlying policy > - else > + else if (vma->vm_policy) > pol = vma->vm_policy; > + else > + pol = current->mempolicy; but these two do not. > return pol; > } > #endif Is is all correct? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
