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    SubjectRe: [PATCH 3/3] mm,migration: Remove straggling migration PTEs when page tables are being moved after the VMA has already moved
    On Wed, Apr 28, 2010 at 10:29:28AM +0900, KAMEZAWA Hiroyuki wrote:
    > Hmm..Mel's patch 2/3 takes vma->anon_vma->lock in vma_adjust(),
    > so this patch clears vma->anon_vma...

    yep, it should be safe with patch 2 applied too. And I'm unsure why Mel's
    patch locks the anon_vma also when vm_start != start. See the other
    email I sent about patch 2.

    > I think we can unlock this just after move_page_tables().

    Checking this, I can't see where exactly is vma->vm_pgoff adjusted
    during the atomic section I protected with the anon_vma->lock?
    For a moment it looks like these pages become unmovable.

    I guess this is why I thought initially that it was move_page_tables
    to adjust the page->index. If it doesn't then the vma->vm_pgoff has to
    be moved down of shift >>PAGE_SHIFT and it doesn't seem to be
    happening which is an unrelated bug.


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