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    SubjectRe: [RFC] Page table sharing
    Date
    On February 19, 2002 02:48 am, Linus Torvalds wrote:
    > On Mon, 18 Feb 2002, Rik van Riel wrote:
    > >
    > > We'll need protection from the swapout code.
    >
    > Absolutely NOT.
    >
    > If the swapout code unshares or shares the PMD, that's a major bug.

    What it will do is change entries on the page table. We have to be sure
    two processes don't read/evict the same page in at the same time.

    > The swapout code doesn't need to know one way or the other, because the
    > swapout code never actually touches the pmd itself, it just follows the
    > pointers - it doesn't ever need to worry about the pmd counts at all.

    That was my original, incomplete view of the situation at first as well.

    --
    Daniel
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