Enhanced Aperiodic Responsiveness by Preemption Control

This paper presents a preemption control based bandwidth preserving server approach to improve the quality of service in terms of better responsiveness to the aperiodic task and reduce their rejection ratio while ensuring the feasibility of periodic task at the same time. Feasibility analysis is done at offline by assigning the priority of periodic tasks as well as server to service the aperiodic tasks by fixed priority rate monotonic first algorithm. The proposed preemption control approach judiciously prevents preemption of the aperiodic task as results reduces losses due to the context switching and have better utilization of budget. The extensive examples and simulation results illustrate that our approach can effectively reduce the average response time of aperiodic tasks as well as reduce the rejection ratio while guaranteeing the periodic tasks at the same time.