Reducing stack with intra-task threshold priorities in real-time systems
EMSOFT '10 Proceedings of the tenth ACM international conference on Embedded software
Partially non-preemptive dual priority multiprocessor scheduling
OPODIS'11 Proceedings of the 15th international conference on Principles of Distributed Systems
Extending fixed task-priority schedulability by interference limitation
Proceedings of the 20th International Conference on Real-Time and Network Systems
Proceedings of the 21st International conference on Real-Time Networks and Systems
Limited preemptive scheduling of non-independent task sets
Proceedings of the Eleventh ACM International Conference on Embedded Software
A review of fixed priority and EDF scheduling for hard real-time uniprocessor systems
ACM SIGBED Review - Special Issue on the 3rd Embedded Operating System Workshop (EWiLi 2013)
| Hi-index | 0.00 |
The question whether preemptive systems are better than non-preemptive systems has been debated for a long time, but only partial answers have been provided in the real-time literature and still some issues remain open. In fact, each approach has advantages and disadvantages, and no one dominates the other when both predictability and efficiency have to be taken into account in the system design. In particular, limiting preemptions allows increasing program locality, making timing analysis more predictable with respect to the fully preemptive case. In this paper, we integrate the features of both preemptive and non-preemptive scheduling by considering that each task can switch to non-preemptive mode, at any time, for a bounded interval. Three methods (with different complexity and performance) are presented to calculate the longest non-preemptive interval that can be executed by each task, under fixed priorities, without degrading the schedulability of the task set, with respect to the fully preemptive case. The methods are also compared by simulations to evaluate their effectiveness in reducing the number of preemptions.