collect_events
n = collect_events(event->group_leader,
n = collect_events(event->group_leader, ppmu->n_counter - 1,
n = collect_events(event->group_leader,
n = collect_events(event->group_leader,
ret = n = collect_events(cpuc, event, false);
n = collect_events(fake_cpuc, leader, true);
n = collect_events(fake_cpuc, event, false);