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Conference Papers Year : 2012

Preemption Delay Analysis for Floating Non-Preemptive Region Scheduling

Vincent Nélis
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Stefan M. Petters
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Isabelle Puaut


In real-time systems, there are two distinct trends for scheduling task sets on unicore systems: non-preemptive and preemptive scheduling. Non-preemptive scheduling is obviously not subject to any preemption delay but its schedulability may be quite poor, whereas fully preemptive scheduling is subject to preemption delay, but benefits from a higher flexibility in the scheduling decisions. The time-delay involved by task preemptions is a major source of pessimism in the analysis of the task Worst-Case Execution Time (WCET) in real-time systems. Preemptive scheduling policies including non-preemptive regions are a hybrid solution between non-preemptive and fully preemptive scheduling paradigms, which enables to conjugate both world's benefits. In this paper, we exploit the connection between the progression of a task in its operations, and the knowledge of the preemption delays as a function of its progression. The pessimism in the preemption delay estimation is then reduced in comparison to state of the art methods, due to the increase in information available in the analysis.
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Dates and versions

hal-00737577 , version 1 (02-10-2012)


  • HAL Id : hal-00737577 , version 1


José Marinho, Vincent Nélis, Stefan M. Petters, Isabelle Puaut. Preemption Delay Analysis for Floating Non-Preemptive Region Scheduling. Design, Automation and Test in Europe 2012 (DATE 2012), Mar 2012, Dresden, Germany. pp.497-502. ⟨hal-00737577⟩
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