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    SubjectRe: x86: clean up smpboot.c's use of udelay+schedule
    On Tue, 31 Jan 2012 13:53:32 +0100
    Ingo Molnar <> wrote:
    > Wanna give a short TODO list to anyone wanting to work on that?

    the biggest thing that needs to happen is splitting the hardware
    specific part ("bring the chip up") and the OS specific part of
    cpu_up() ("get the cpu into our accounting/awareness").

    the former does not need the hotplug or any other big lock (just a state
    machine), the later needs the hotplug lock for obvious reasons.
    The former is the part that takes a long time (> 100msec for a first
    cpu in a package, > 30msec for second and later), the later is quick.

    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,

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