perf_event_count
child_val = perf_event_count(child_event, false);
total += perf_event_count(event, false);
total += perf_event_count(child, false);
values[n++] += perf_event_count(leader, false);
values[n++] += perf_event_count(sub, false);
userpg->offset = perf_event_count(event, false);
values[n++] = perf_event_count(event, has_inherit_and_sample_read(&event->attr));
values[n++] = perf_event_count(leader, self);
values[n++] = perf_event_count(sub, self);