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Real-Time Embedded Systems by Xiaocong Fan

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Chapter 16

Real-Time Scheduling

Rate-Monotonic Approach

Abstract

According to the rate-monotonic assignment (RMA) principle, a task with the highest request rate (job release frequency) should have the highest priority. RMA is an optimal static-priority assignment approach in the sense that a task set cannot be scheduled by any other static-priority assignment if it cannot be scheduled by the RMA principle. Some theoretical results are introduced to guide a designer in the schedulability analysis. Generally, a task set is schedulable if the accumulative CPU utilization is less than a bound. If this bound test fails, another test called a completion-time test can be applied to the task set to analyze further its schedulability. If a task ...

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