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    SubjectRe: [PATCH 1/2] scalable rw_mutex
    On Sat, 12 May 2007 11:06:24 -0700 Andrew Morton <> wrote:

    > We could put a cpumask in percpu_counter, initialise it to
    > cpu_possible_map. Then, those callsites which have hotplug notifiers can
    > call into new percpu_counter functions which clear and set bits in that
    > cpumask and which drain percpu_counter.counts[cpu] into
    > percpu_counter.count.
    > And percpu_counter_sum() gets taught to do for_each_cpu_mask(fbc->cpumask).

    Perhaps we could have a single cpu hotplug notifier in the percpu_counter
    library. Add register/deregister functions to the percpu_counter API so
    that all percpu_counters in the machine can be linked together.

    One _could_ just register and deregister the counters in
    percpu_counter_init() and percpu_counter_destroy(), but perhaps that
    wouldn't suit all callers, dunno.

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