EDF-VD Scheduling of Mixed-Criticality Systems with Degraded Quality Guarantees
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.
Keywords
Cite
@article{arxiv.1605.01302,
title = {EDF-VD Scheduling of Mixed-Criticality Systems with Degraded Quality Guarantees},
author = {Di Liu and Jelena Spasic and Gang Chen and Nan Guan and Songran Liu and Todor Stefanov and Wang Yi},
journal= {arXiv preprint arXiv:1605.01302},
year = {2018}
}