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    SubjectRe: What's wrong with MAP_SHARED|MAP_ANONYMOUS?
    On Sun, Sep 27, 1998 at 04:10:02PM +0200, Alexey Kuznetsov wrote:
    > Hello!
    >
    > > These mappings have a big advantage over anonymous mappings too - you
    > > can pass them around between processes using fd descriptor passing.
    >
    > How to prevent aggressive syncing dirty pages to disk for them?
    > They should make swap-like syncs to be useful.

    True, it would be worth a mprotect() flag.

    What I would like to see in 2.3 would be a special device works that
    hands out anonymous swap space associated with a fd
    (something like a combination of /dev/zero and a SVR4 clone device)

    With that POSIX shared memory could be implemented in user space -
    using a daemon and access to the daemon's /proc/<pid>/fd/* files.

    -Andi

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