Starting at the queue and iteratively repeating at each scheduling level until reaching the root scheduler, {HEAD ~ each node} in {TAIL ~ the scheduling hierarchy} maintains an actual count of tasks corresponding to the node 
Starting at the queue and iteratively repeating at each scheduling level until reaching the root scheduler , { HEAD ~ each node } in { TAIL ~ the scheduling hierarchy } maintains an actual count of tasks corresponding to the node
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH