BFQ_MIN_TT
sl = min_t(u64, sl, BFQ_MIN_TT);
now_ns - bfqd->last_completion < BFQ_MIN_TT)
*delta_ms = BFQ_MIN_TT / NSEC_PER_MSEC;
if (delta_us > BFQ_MIN_TT/NSEC_PER_USEC &&