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    SubjectRe: [RFC][PATCH 0/3] fork: Add the ability to create tasks with?given pids
    On 11/25, Pedro Alves wrote:
    >
    > From the perspective of a client that is
    > going to use this on a live system, CLONE_CHILD_USEPIDS seems a little better,
    > in that the pid race is only against another task reusing the same pid,

    Yes. Except you can't use on a live system at all. It simply doesn't
    work after the first "normal" clone() without CLONE_CHILD_USEPIDS.

    Although we can probably allow CLONE_CHILD_USEPIDS for CAP_SYS_ADMIN.

    > while with setting last_pid, you have a try/whoops-not-the-pid-I-want/kill/retry/rinse/repeat/
    > loop racing against all fork/clone's in the system,

    Yes, setting last_pid can race with another fork(). I agree this
    sucks. But simple ;)

    Oleg.



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