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Analysis of Memory-Contention in Heterogeneous COTS MPSoCs

Authors Mohamed Hassan, Rodolfo Pellizzoni

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Mohamed Hassan
  • McMaster University, Hamilton, Canada
Rodolfo Pellizzoni
  • University of Waterloo, Canada

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Mohamed Hassan and Rodolfo Pellizzoni. Analysis of Memory-Contention in Heterogeneous COTS MPSoCs. In 32nd Euromicro Conference on Real-Time Systems (ECRTS 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 165, pp. 23:1-23:24, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.ECRTS.2020.23

Abstract

Multiple-Processors Systems-on-Chip (MPSoCs) provide an appealing platform to execute Mixed Criticality Systems (MCS) with both time-sensitive critical tasks and performance-oriented non-critical tasks. Their heterogeneity with a variety of processing elements can address the conflicting requirements of those tasks. Nonetheless, the complex (and hence hard-to-analyze) architecture of Commercial-Off-The-Shelf (COTS) MPSoCs presents a challenge encumbering their adoption for MCS. In this paper, we propose a framework to analyze the memory contention in COTS MPSoCs and provide safe and tight bounds to the delays suffered by any critical task due to this contention. Unlike existing analyses, our solution is based on two main novel approaches. 1) It conducts a hybrid analysis that blends both request-level and task-level analyses into the same framework. 2) It leverages available knowledge about the types of memory requests of the task under analysis as well as contending tasks; specifically, we consider information that is already obtainable by applying existing static analysis tools to each task in isolation. Thanks to these novel techniques, our comparisons with the state-of-the art approaches show that the proposed analysis provides the tightest bounds across all evaluated access scenarios.

Subject Classification

ACM Subject Classification
  • Computer systems organization → Real-time systems
  • Computer systems organization → System on a chip
  • Computer systems organization → Multicore architectures
Keywords
  • DRAM
  • Memory
  • COTS
  • Multi-core
  • Real-Time
  • Embedded Systems
  • Analysis

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