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    SubjectRe: [PATCH 2/4] sched: implement __set_cpus_allowed()

    On 05/31/2010 12:46 PM, Peter Zijlstra wrote:
    > So workers _are_ thread bound and don't migrate, so for those I don't
    > see the problem, that is of course until we have to break affinity when
    > their CPU goes down, at which point we should clear PF_THREAD_BOUND I
    > think.
    > For the rescue thread, why not set PF_THREAD_BOUND when its running
    > worklets and clear it when done? That way we get extra checking that
    > people won't migrate it when its not allowed.
    > Does that work, or did I miss something?

    The rescuers migrate themselves so should be okay. I still think it
    would be better to migrate back detached workers. It's a slow path
    for sure but there's a big gaping hole between machine-slow and
    human-slow and works can be human-slow (ie. hotplug operation not
    finished in several minutes). I'll see if that's implementable w/o
    adding an additional interface.



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