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    SubjectRe: [RFC PATCH(Experimental) 1/4] freezer-cpu-hotplug core
    On 02/14, Gautham R Shenoy wrote:
    >
    > o Splits CPU_DEAD into two events namely
    > - CPU_DEAD: which will be handled while the processes are still
    > frozen.
    >
    > - CPU_DEAD_KILL_THREADS: To be handled after we thaw_processes.


    Imho, this is not right. This change the meaning of CPU_DEAD, and so
    we should fix all users of CPU_DEAD as well.

    How about

    CPU_DEAD_WHATEVER
    the processes are still frozen

    CPU_DEAD
    after we thaw_processes

    This way we can add processing of the new CPU_DEAD_WHATEVER event where
    it may help. We don't need to change (for example) workqueue.c with this
    patch, we can do it in a separate patch.


    CPU_UP_PREPARE is called after freeze_processes()... Probably this works,
    but imho this is no good. Suppose for a moment that khelper will be frozen
    (yes, yes it can't be), then we can't do kthread_create().

    Oleg.

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