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    SubjectRe: init's children list is long and slows reaping children.
    > So I think we have some options once we get the kernel threads out
    > of the way. Getting the kernel threads out of the way would seem
    > to be the first priority.

    I think both avenues would probably be the right way to proceeed.
    Getting kthreads to not be parented by init would be an opportunity
    for optimization.

    I think organizing the zombie tasks to be easily reaped also has merit.
    Rapidly forking/exiting processes like udevd during the boot of a
    different machine were also shown to benefit significantly from this
    patch. That machine had 512 cpus and 4608 disk devices, we dropped the
    device discovery under udevd by 30%. This, honestly, surprised us.
    It makes some sense now that I think about it. This would be a case
    where improving the zombie handling would be beneficial to more than
    just kthreads.

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