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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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