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    SubjectRe: [QUICKLIST 0/4] Arch independent quicklists V2
    > On Tue, 13 Mar 2007 22:30:19 +1100 Nick Piggin <nickpiggin@yahoo.com.au> wrote:
    > We don't actually have to zap_pte_range the entire page table in
    > order to free it (IIRC we used to have to, before the 4lpt patches).

    I'm trying to remember why we ever would have needed to zero out the pagetable
    pages if we're taking down the whole mm? Maybe it's because "oh, the
    arch wants to put this page into a quicklist to recycle it", which is
    all rather circular.

    It would be interesting to look at a) leave the page full of random garbage
    if we're releasing the whole mm and b) return it straight to the page allocator.
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