Messages in this thread | | | Date | Sat, 12 May 2007 11:11:00 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 1/2] scalable rw_mutex |
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On Sat, 12 May 2007 11:06:24 -0700 Andrew Morton <akpm@linux-foundation.org> 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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