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    SubjectRe: [rfc] increase struct page size?!
    Andrew Morton wrote:
    > On Sat, 19 May 2007 11:15:01 -0700 William Lee Irwin III <> wrote:
    >> Much the same holds for the atomic_t's; 32 + PAGE_SHIFT is
    >> 44 bits or more, about as much as is possible, and one reference per
    >> page per page is not even feasible. Full-length atomic_t's are just
    >> not necessary.
    > You can overflow a page's refcount by mapping it 4G times. That requires
    > 32GB of pagetable memory. It's quite feasible with remap_file_pages().
    But do anybody ever need to do that?
    Such an attack is easily thwarted by refusing to map it more
    than, say 3G times?

    Helge Hafting
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