perout_conf_real_time
*time_stamp = real_time ? perout_conf_real_time(rq->perout.start.sec, 0) :
*period = perout_conf_real_time(rq->perout.period.sec, rq->perout.period.nsec);
*time_stamp = perout_conf_real_time(time->sec, time->nsec);