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    SubjectRe: [PATCH 1/7] Freezer: Read PF_BORROWED_MM in a nonracy way
    On 05/12, Oleg Nesterov wrote:
    >
    > Do we need freezer? Should we freeze kernel threads? I can't judge. I tried
    > to read a long thread about suspend, and failed to understand it.
    >
    > I personally think we can simplify things if CPU-hotplug use freezer, at least.

    Just a small example,

    debug_smp_processor_id:

    /*
    * Kernel threads bound to a single CPU can safely use
    * smp_processor_id():
    */
    this_mask = cpumask_of_cpu(this_cpu);

    if (cpus_equal(current->cpus_allowed, this_mask))
    goto out;

    This is not true with CONFIG_HOTPLUG_CPU. This becomes true if we freeze
    the kernel threads from CPU_DOWN_PREPARE to CPU_DEAD.

    Oleg.

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