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    From
    SubjectRe: broken VM in 2.4.10-pre9
    Date
    On September 20, 2001 12:04 am, Alan Cox wrote:
    > Reverse mappings make linear aging easier to do but are not critical (we
    > can walk all physical pages via the page map array).

    But you can't pick up the referenced bit that way, so no up aging, only
    down.

    --
    Daniel
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