Ceph » CephFS

void OpHistory::_insert_delayed(const utime_t& now, TrackedOpRef op)
{
...
  double opduration = op->get_duration();
...
  if (opduration >= history_slow_op_threshold.load()) {
    slow_op.insert(make_pair(op->get_initiated(), op));
    logger->inc(l_trackedop_slow_op_count);
  }
...
}

mds op_tracker have no set slow op threshold, and history_slow_op_threshold default value is 0, cause to mds have slow op alway.