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    Timing Analysis for Preemptive Multi-tasking Real-Time Systems with Caches

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    GIT-CC-04-02.pdf (161.3Kb)
    Date
    2004
    Author
    Tan, Yudong
    Mooney, Vincent John, III
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    Abstract
    In this paper, we propose an approach to estimate the Worst Case Response Time (WCRT) of each task in a preemptive multi-tasking single-processor real-time system with an L1 cache. The approach combines inter-task cache eviction analysis and intra-task cache access analysis to estimate the number of cache lines that can possibly be evicted by the preempting task and also be accessed again by the preempted task after preemptions (thus requiring the preempted task to reload the cache line(s)). This cache reload delay caused by preempting tasks is then incorporated into WCRT analysis. Two sets of applications are used to test our approach. Each set of applications contains three tasks. The experimental results show that our approach can tighten the WCRT estimate by 38% (1.6X) to 56% (2.3X) over prior state-of-the-art.
    URI
    http://hdl.handle.net/1853/6487
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    • College of Computing Technical Reports [506]

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