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    SubjectRe: exclusive cpusets broken with cpu hotplug
    Dinakar wrote:
    > I have a patch (though a very old one...) for handling hotplug and cpusets.
    > However there were some ugly locking issues and nesting of locks ...

    The interaction of cpusets and hotplug should be in good shape. Look
    in kernel/cpuset.c for CONFIG_HOTPLUG_CPU and CONFIG_MEMORY_HOTPLUG,
    and you will see the two routines to call for cpu and memory hotplug
    events, cpuset_handle_cpuhp() and cpuset_track_online_nodes().

    The problem area is the interaction of dynamic sched domains and
    cpusets with hot plug events.

    I won't rest till it's the best ...
    Programmer, Linux Scalability
    Paul Jackson <> 1.925.600.0401
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