ktr_otv
kth->ktr_otv.tv_sec = ts.tv_sec;
kth->ktr_otv.tv_usec = ts.tv_nsec / 1000;
kte->kte_kth.ktr_otv.tv_sec = ts->tv_sec;
kte->kte_kth.ktr_otv.tv_usec = ts->tv_nsec / 1000;
timersub(&kth->ktr_otv,
prevtime.tv.tv_sec = kth->ktr_otv.tv_sec;
prevtime.tv.tv_usec = kth->ktr_otv.tv_usec;
temp.tv.tv_sec = kth->ktr_otv.tv_sec;
temp.tv.tv_usec = kth->ktr_otv.tv_usec;