On Tue, Nov 05, 2013 at 06:01:25PM +0100, Stephane Eranian wrote:
> +static void rapl_exit_cpu(int cpu)
> +{
> + int i, phys_id = topology_physical_package_id(cpu);
> +
> + spin_lock(&rapl_hotplug_lock);
> +
> + /* if CPU not in RAPL mask, nothing to do */
> + if (!cpumask_test_and_clear_cpu(cpu, &rapl_cpu_mask))
> + goto skip;
> +
> + /* find a new cpu on same package */
> + for_each_online_cpu(i) {
> + if (i == cpu || i == 0)
> + continue;
> + if (phys_id == topology_physical_package_id(i)) {
> + cpumask_set_cpu(i, &rapl_cpu_mask);
> + break;
> + }
> + }
> +
> + WARN_ON(cpumask_empty(&rapl_cpu_mask));
> +skip:
> + spin_unlock(&rapl_hotplug_lock);
> +}
> +static int rapl_cpu_notifier(struct notifier_block *self,
> + unsigned long action, void *hcpu)
> +{
> + /* select the cpu that collects uncore events */
> + switch (action & ~CPU_TASKS_FROZEN) {
> + case CPU_DOWN_FAILED:
> + case CPU_STARTING:
> + rapl_init_cpu(cpu);
> + break;
> + case CPU_DOWN_PREPARE:
> + rapl_exit_cpu(cpu);
> + break;
> + default:
> + break;
> + }
> +
> + return NOTIFY_OK;
> +}
All other uncore drivers call perf_pmu_migrate_context() when the CPU
the events are registered on goes away.. ?
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