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arXiv · 1605.01302

EDF-VD Scheduling of Mixed-Criticality Systems with Degraded Quality Guarantees

Di Liu·Jelena Spasic·Gang Chen·Nan Guan·Songran Liu·Todor Stefanov·Wang Yi
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Abstract

This paper studies real-time scheduling of mixed-criticality systems where low-criticality tasks are still guaranteed some service in the high-criticality mode, with reduced execution budgets. First, we present a utilization-based schedulability test for such systems under EDF-VD scheduling. Second, we quantify the suboptimality of EDF-VD (with our test condition) in terms of speedup factors. In general, the speedup factor is a function with respect to the ratio between the amount of resource required by different types of tasks in different criticality modes, and reaches 4/3 in the worst case. Furthermore, we show that the proposed utilization-based schedulability test and speedup factor results apply to the elastic mixed-criticality model as well. Experiments show effectiveness of our proposed method and confirm the theoretical suboptimality results.

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Di Liu, Jelena Spasic, Gang Chen, Nan Guan, Songran Liu, Todor Stefanov, Wang Yi. 2016-05-04. EDF-VD Scheduling of Mixed-Criticality Systems with Degraded Quality Guarantees. https://doi.org/10.1109/rtss.2016.013

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