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    SubjectRe: [rfc] increase struct page size?!
    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().

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