stat_timeval_subtract
stat_timeval_subtract(&shm_stat->time.up_sec, &shm_stat->time.up_usec, worker->env.now_tv, &worker->daemon->time_boot);
stat_timeval_subtract(&shm_stat->time.elapsed_sec, &shm_stat->time.elapsed_usec, worker->env.now_tv, &worker->daemon->time_last_stat);