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    SubjectRe: [PATCH 2/3] make kthread_create() more scalable
    Date
    Andrew Morton <akpm@linux-foundation.org> writes:
    >
    > OK, I fixed that up.
    >
    > The next patch (make-kthread_stop-scalable) removes the find_task_by_pid()
    > anyway.

    Ok. Neat. I still need to review these a little more I have a different
    set of criteria, but it is interesting work..

    > Our kthread creation performance will be pretty poor anyway, due to the
    > need to do two (or more?) context switches. If we ever need
    > super-low-latency kernel thread creation (eg, on-demand threads for AIO)
    > then that code would need to go direct to kernel_thread(), I guess.

    Sure. AIO is a little bit of a different beast as it is IO for user space.

    If low latency is important for starting kernel threads the right
    answer would be to dig into the code and have a version rewrite
    kernel_thread so that we copied a reference process instead of the
    current.

    Right now my practical target is killing all of the kernel threads
    started with kernel_thread that then call daemonize. So we can remove
    daemonize, as it is a serious maintenance hazard. kthread needs just
    a little bit more work to support that.

    Eric
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