pmu_for_each_sys_metric
int pmu_for_each_sys_metric(pmu_metric_iter_fn fn, void *data);
return pmu_for_each_sys_metric(test__parsing_fake_callback, NULL);
return pmu_for_each_sys_metric(test__parsing_threshold_callback, NULL);
pmu_for_each_sys_metric(test__parsing_callback, &failures);
return pmu_for_each_sys_metric(metricgroup__sys_event_iter, &sys_data);
ret = pmu_for_each_sys_metric(pyrf__metrics_cb, list);