calccru
calccru(p, &cutime, &cstime);
calccru(p, &rup->ru_utime, &rup->ru_stime);
calccru(p, &kp->ki_childutime, &kp->ki_childstime);
calccru(p, &rup->ru_utime, &rup->ru_stime);
void calccru(struct proc *p, struct timeval *up, struct timeval *sp);