ruadd
ruadd(&q->p_stats->p_cru, &q->p_crux, &p->p_ru, &p->p_rux);
ruadd(&p->p_ru, &p->p_rux, &p->p_stats->p_cru, &p->p_crux);
void ruadd(struct rusage *ru, struct rusage_ext *rux, struct rusage *ru2,