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Improving the Accuracy of Cache-Aware Response Time Analysis Using Preemption Partitioning

Authors Filip Marković , Jan Carlson, Sebastian Altmeyer, Radu Dobrin

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Filip Marković
  • Mälardalen University, Västerås, Sweden
Jan Carlson
  • Mälardalen University, Västerås, Sweden
Sebastian Altmeyer
  • University of Augsburg, Germany
Radu Dobrin
  • Mälardalen University, Västerås, Sweden

Acknowledgements

We want to thank our colleagues Sebastian Hahn, Jan Reineke, and Darshit Shah, who provided us with the evaluation data derived from the code-level analysis of benchmark programs. Also, we are very grateful to Davor Čirkinagić who borrowed his powerful computing system for performing schedulability evaluation.

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Filip Marković, Jan Carlson, Sebastian Altmeyer, and Radu Dobrin. Improving the Accuracy of Cache-Aware Response Time Analysis Using Preemption Partitioning. In 32nd Euromicro Conference on Real-Time Systems (ECRTS 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 165, pp. 5:1-5:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.ECRTS.2020.5

Abstract

Schedulability analyses for preemptive real-time systems need to take into account cache-related preemption delays (CRPD) caused by preemptions between the tasks. The estimation of the CRPD values must be sound, i.e. it must not be lower than the worst-case CRPD that may occur at runtime, but also should minimise the pessimism of estimation. The existing methods over-approximate the computed CRPD upper bounds by accounting for multiple preemption combinations which cannot occur simultaneously during runtime. This over-approximation may further lead to the over-approximation of the worst-case response times of the tasks, and therefore a false-negative estimation of the system’s schedulability. In this paper, we propose a more precise cache-aware response time analysis for sporadic real-time systems under fully-preemptive fixed priority scheduling. The evaluation shows a significant improvement over the existing state of the art approaches.

Subject Classification

ACM Subject Classification
  • Computer systems organization → Real-time system specification
  • Software and its engineering → Real-time schedulability
Keywords
  • Real-time systems
  • Fixed-Priority Preemptive Scheduling
  • Preemption delay

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