NDLI: Scheduling Self-Suspending Real-Time Tasks with Rate-Monotonic Priorities

Content Provider	IEEE Xplore Digital Library
Author	Lakshmanan, K. Rajkumar, R.
Copyright Year	2010
Description	Author affiliation: Carnegie Mellon Univ., Pittsburgh, PA, USA (Lakshmanan, K.; Rajkumar, R.)
Abstract	Recent results have shown that the feasibility problem of scheduling periodic tasks with self-suspensions is NP-hard in the strong sense. We observe that a variation of the problem statement that includes sporadic tasks instead of periodic tasks results in a simple characterization of the critical scheduling instant. This in turn leads to an exact characterization of the critical instant for self-suspending tasks with respect to the interference (preemption) from higher-priority sporadic tasks. Using this characterization, we provide pseudo-polynomial response-time tests for analyzing the schedulability of such self-suspending tasks. Self-suspending tasks can also result in more worst-case interference to lower-priority tasks than their equivalent non-suspending counterparts with zero suspension intervals. Hence, we develop a dynamic slack enforcement scheme, which guarantees that the worst-case interference caused by suspending sporadic tasks is no more than the worst-case interference arising from equivalent non-suspending sporadic tasks without suspension intervals. The worst-case response time of self-suspending sporadic tasks themselves is also shown to be unaffected by dynamic slack enforcement, thereby making it optimal. In order to reduce the runtime complexity of slack enforcement, a static slack enforcement scheme is also developed. Empirical analysis of these schemes and the previously studied period enforcement algorithm shows that static slack enforcement achieves within 3% of the breakdown utilization of dynamic slack enforcement, while period enforcement achieves within 14% of dynamic slack enforcement. System designers can take advantage of these different execution control policies depending on their taskset utilizations and implementation constraints.
Starting Page	3
Ending Page	12
File Size	983516
Page Count	10
File Format	PDF
ISBN	9781424466900
ISSN	10801812
e-ISBN	9781424466917
DOI	10.1109/RTAS.2010.38
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-04-12
Publisher Place	Sweden
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Algorithm design and analysis Electric breakdown Real-time Interference Blocking Control systems Suspension Job design Scheduling Delay Runtime Processor scheduling USA Councils Automatic testing Slack Analysis Performance
Content Type	Text
Resource Type	Article

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