Cache-Related Timing Analysis for Multi-tasking Real-Time Systems with Nested Preemptions
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Author(s)
Tan, Yudong
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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 utilizing 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 task(s) 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 up to 32% (1.4X) over
prior state-of-the-art.
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Date
2004
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Technical Report