Multilevel Feedback Queue

• A process can move between the various queues; aging can be implemented this way.
• Multilevel-feedback-queue scheduler defined by the following parameters:

1. number of queues
2. scheduling algorithms for each queue
3. method used to determine when to upgrade a process
4. method used to determine when to demote a process
5. method used to determine which queue a process will enter when that process needs service