event_open_with_cpu
FAIL_IF(event_open_with_cpu(event, cpu));
FAIL_IF(event_open_with_cpu(event, cpu));
FAIL_IF(event_open_with_cpu(event, cpu));
FAIL_IF(event_open_with_cpu(&event, 0) == 0);
int event_open_with_cpu(struct event *e, int cpu);