NDLI: Worst-Case Response Time Analysis of Real-Time Tasks under Fixed-Priority Scheduling with Deferred Preemption Revisited

Content Provider	IEEE Xplore Digital Library
Author	Bril, R.J. Lukkien, J.J. Verhaegh, W.F.J.
Copyright Year	2007
Description	Author affiliation: Tech. Univ. Eindhoven, Eindhoven (Bril, R.J.; Lukkien, J.J.)
Abstract	Fixed-priority scheduling with deferred preemption (FPDS) has been proposed in the literature as a viable alternative to fixed-priority preemptive scheduling (FPPS), that both reduces the cost of arbitrary preemptions and removes the need for non-trivial resource access protocols. This paper shows that existing worst-case response time analysis of hard real-time tasks under FPDS, arbitrary phasing and relative deadlines at most equal to periods is both pessimistic and optimistic. This paper provides a revised analysis, resolving the problems with the existing approaches. The analysis assumes a continuous scheduling model. It is shown that the critical instant, longest busy period, and worst-case response time for a task are suprema rather than maxima for all tasks, except for the lowest priority task. Moreover, it is shown that the analysis is not uniform for all tasks, i.e. the analysis for the lowest priority task differs from the analysis of the other tasks, because only the lowest priority task cannot be blocked. To build on earlier work, the worst-case response time analysis for FPDS is expressed in terms of known worst-case analysis results for FPPS. The paper includes pessimistic variants of the analysis, which are uniform for all tasks.
Starting Page	269
Ending Page	279
File Size	218590
Page Count	11
File Format	PDF
ISBN	0769529143
ISSN	10683070
DOI	10.1109/ECRTS.2007.38
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-04
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay Access protocols Processor scheduling Real time systems Costs Laboratories Cache memory Bridges System performance Degradation
Content Type	Text
Resource Type	Article

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