Preemptive Uniprocessor Scheduling of Mixed-Criticality Sporadic Task Systems
Journal of the ACM , Volume 62 - Issue 2 p. 1- 33
Systems in many safety-critical application domains are subject to certification requirements. For any given system, however, it may be the case that only a subset of its functionality is safety-critical and hence subject to certification; the rest of the functionality is non-safety-critical and does not need to be certified, or is certified to lower levels of assurance. The certification-cognizant runtime scheduling of such mixed- criticality systems is considered. An algorithm called EDF-VD (for Earliest Deadline First with Virtual Deadlines) is presented: this algorithm can schedule systems for which any number of criticality levels are defined. Efficient implementations of EDF-VD, as well as associated schedulability tests for determining whether a task system can be correctly scheduled using EDF-VD, are presented. For up to 13 criticality levels, analyses of EDF-VD, based on metrics such as processor speedup factor and utilization bounds, are derived, and conditions under which EDF-VD is optimal with respect to these metrics are identified. Finally, two extensions of EDF-VD are discussed that enhance its applicability. The extensions are aimed at scheduling a wider range of task sets, while preserving the favorable worst-case resource usage guarantees of the basic algorithm
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Baruah, S.K, Bonifaci, V, D'Angelo, G, Li, H, Marchetti Spaccamela, A, van der Ster, S.L, & Stougie, L. (2015). Preemptive Uniprocessor Scheduling of Mixed-Criticality Sporadic Task Systems. Journal of the ACM, 62(2), 1–33.