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arXiv · 2410.18308

Exact schedulability test for sporadic mixed-criticality real-time systems using antichains and oracles

Simon Picard·Antonio Paolillo·Gilles Geeraerts·Joël Goossens
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Abstract

This work addresses the problem of exact schedulability assessment in uniprocessor mixed-criticality real-time systems with sporadic task sets. We model the problem by means of a finite automaton that has to be explored in order to check for schedulability. To mitigate the state explosion problem, we provide a generic algorithm which is parameterised by several techniques called oracles and simulation relations. These techniques leverage results from the scheduling literature as "plug-ins" that make the algorithm more efficient in practice. Our approach achieves up to a 99.998% reduction in the search space required for exact schedulability testing, making it practical for a range of task sets, up to 8 tasks or maximum periods of 350. This method enables to challenge the pessimism of an existing schedulability test and to derive a new dynamic-priority scheduler, demonstrating its good performance. This is the full version of an RTNS 2024 paper.

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Simon Picard, Antonio Paolillo, Gilles Geeraerts, Joël Goossens. 2024-10-23. Exact schedulability test for sporadic mixed-criticality real-time systems using antichains and oracles. https://doi.org/10.1145/3696355.3699702

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