Dispatching Priority

SRM defines dispatching priority for service class periods. All address spaces in a service class period have the same base dispatching priority. Multiple service class periods may have the same base dispatching priority. After a dispatching priority change, service class periods may be remapped to different dispatching priorities such that there is an unoccupied priority between each occupied priority. This process is referred to as priority unbunching.

The dispatching priority is recorded in the subtype 2 records.