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    SubjectRe: [RFC] NUMA futex hashing
    Ulrich Drepper wrote:

    >> Of course we would need a new syscall, and to change glibc to be able to
    >> actually use this new private_futex syscall.
    >
    >
    > No, why? The kernel already does recognize private mutexes. It just
    > checks whether the pages used to store it are private or mapped. This
    > requires some interaction with the memory subsystem but as long as no
    > crashes happen the data can change underneath. It's the program's
    > fault if it does.


    Because that requires taking mmap_sem. Avoiding that is the whole
    purpose, isn't it?

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