NSTARTD_FAILURE_TIMES
int index = startd_failure_index++ % NSTARTD_FAILURE_TIMES;
if (startd_failure_index < NSTARTD_FAILURE_TIMES)
(startd_failure_time[(n - 1) % NSTARTD_FAILURE_TIMES] -
startd_failure_time[n % NSTARTD_FAILURE_TIMES]) /
NSTARTD_FAILURE_TIMES;
static hrtime_t startd_failure_time[NSTARTD_FAILURE_TIMES];