Preemptive priority-based scheduling: an appropriate engineering approach
Advances in real-time systems
Scheduling Algorithms for Multiprogramming in a Hard-Real-Time Environment
Journal of the ACM (JACM)
Deadline Scheduling for Real-Time Systems: Edf and Related Algorithms
Deadline Scheduling for Real-Time Systems: Edf and Related Algorithms
Biasing Effects in Schedulability Measures
ECRTS '04 Proceedings of the 16th Euromicro Conference on Real-Time Systems
The Limited-Preemption Uniprocessor Scheduling of Sporadic Task Systems
ECRTS '05 Proceedings of the 17th Euromicro Conference on Real-Time Systems
Non-Preemptive Robustness under Reduced System Load
RTSS '05 Proceedings of the 26th IEEE International Real-Time Systems Symposium
Response time analysis of EDF distributed real-time systems
Journal of Embedded Computing - Real-Time Systems (Euromicro RTS-03)
ECRTS '07 Proceedings of the 19th Euromicro Conference on Real-Time Systems
Schedulability analysis of non-preemptive recurring real-time tasks
IPDPS'06 Proceedings of the 20th international conference on Parallel and distributed processing
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The optimality of preemptive EDF scheduling with relation to the achievable system utilization is a clear advantage of this scheduling policy for single processor realtime systems. However, recent works suggested that the run-time behavior of EDF might be improved by limiting the preemption support only to particular time instants, dividing each task into a sequence of nonpreemptive chunks of execution, without affecting the schedulability of the system. In this paper, we will take a closer look to limited preemption EDF scheduling (LP-EDF), evaluating the potential advantages offered by this policy in terms of response-time reduction and improved control performances. In particular, we will show how to increase the responsiveness of a control application by placing nonpreemptive regions of maximal length at the end of the code of selected tasks. The effectiveness of the proposed method will be proved both analytically and by extensive simulations.