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Real-Time System Design using Preemption Thresholds

By Manas Saksena and Yun Wangt


The maturity of schedulabilty analysis techniques for fired-priority preemptive scheduling has enabled the consideration of timing issues at design time using a specification of the tasking architecture and estimates of execution times for tasks. While successful, this approach has limitations since the preemptive multi-tasking model does not scale well for a large number of tasks, and the fired priority scheduling theory does not work well with many object-oriented design methods. In this paper we present an approach that scales well even when the design consists of a large number of concurrent jobs. The approach avoids any unnecessary preemptability in the system, thereby resulting in reduced run-time overheads from preemptions and associated context-switches. It also allows significant memory savings by grouping jobs into non-preemptive groups and then sharing the stack space between them. Our approach is based on our earlier work on scheduling using preemption thresholds that allows parametric control over preemptability in a priority based system. We show that our approach provides significant advantages over one using fixed-priority preemptive scheduling architecture. The benefits include higher schedulability for small number of tasks, and lower runtime overheads, and hence better scalability. We develop algorithms that allow design time consideration of schedulability, and automatic synthesis of an implementation model to minimize run-time overheads. 1

Year: 2000
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