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    SubjectRe: VM subsystem bug in 2.4.0 ?
    Hi Stephen,

    On Tue, 9 Jan 2001, Stephen C. Tweedie wrote:
    > But again, how do you clear the bit? Locking is a per-vma property,
    > not per-page. I can mmap a file twice and mlock just one of the
    > mappings. If you get a munlock(), how are you to know how many
    > other locked mappings still exist?

    It's worse: The issue we are talking about is SYSV IPC_LOCK. This is a
    per segment thing. A user can (un)lock a segment at any time. But we
    do not have the references to the vmas attached to the segemnts or to
    the pages allocated.


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