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    SubjectRe: [PATCH 01/11] mm,migration: Take a reference to the anon_vma before migrating
    On Sat, Mar 13, 2010 at 1:41 AM, Mel Gorman <> wrote:
    > rmap_walk_anon() does not use page_lock_anon_vma() for looking up and
    > locking an anon_vma and it does not appear to have sufficient locking to
    > ensure the anon_vma does not disappear from under it.
    > This patch copies an approach used by KSM to take a reference on the
    > anon_vma while pages are being migrated. This should prevent rmap_walk()
    > running into nasty surprises later because anon_vma has been freed.
    > Signed-off-by: Mel Gorman <>
    > Acked-by: Rik van Riel <>
    Reviewed-by: Minchan Kim <>

    BTW, This another refcount of anon_vma is merged with KSM by [3/11].
    Looks good to me.

    Kind regards,
    Minchan Kim

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