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    SubjectRe: x86 question: Can a process have > 3GB memory?
    >> Hey Cliff, we are planning to implement virtwin() if you remember that
    >> from PTX. AWE on NT was derived from the same work. There should soon
    >> be some discussion about it on lse-tech@lists.sourceforge.net or I can
    >> give you some more data...
    >
    > Please implement it in userspace, using large POSIX shared memory
    > segments and mmaping / munmapping them as needed.
    >
    > This seems like a special enough case to keep it out of the kernel
    > entirely. If there's something not efficient enough we could work
    > on optimising the whole mmap & munmap path...

    How are you going to change the user page tables from userspace?
    This mechanism would seem to need kernel support however you did it.

    M.

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