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SubjectRe: [PATCH] mm: Check if PTE is already allocated during page fault
On Fri, Apr 15, 2011 at 11:12:48AM +0100, Mel Gorman wrote:
> diff --git a/mm/memory.c b/mm/memory.c
> index 5823698..1659574 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3322,7 +3322,7 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
> * run pte_offset_map on the pmd, if an huge pmd could
> * materialize from under us from a different thread.
> */
> - if (unlikely(__pte_alloc(mm, vma, pmd, address)))
> + if (unlikely(pmd_none(*pmd)) && __pte_alloc(mm, vma, pmd, address))
> return VM_FAULT_OOM;
> /* if an huge pmd materialized from under us just retry later */
> if (unlikely(pmd_trans_huge(*pmd)))

Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>



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