SHERP

A Safe Stochastic Analysis with Relaxed Limitations on the Periodic Task Model

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Authors
Kim, Kanghee; Lee, Chang-Gun
Issue Date
2009-05
Publisher
IEEE Computer Society
Citation
IEEE transactions on computers, 58(5):634-647, 2009.
Keywords
Stochastic AnalysisPeriodic Task Model
Abstract
This paper proposes a safe stochastic analysis for fixed-priority scheduling, which is applicable to a broader spectrum of periodic tasks than the ones analyzable by any of the existing techniques. The proposed analysis can find a safe upper-bound of deadline miss probability for periodic tasks with 1) arbitrary execution time distributions, 2) varying interrelease times with the period as the minimum, and 3) the maximum utilization factor U^{max} that can be greater than 1. One challenge for this is that the release times of tasks are not known a priori because we are not limiting the interrelease times of each task to a constant, i.e., the period. In such a situation, the relative phases of task instances at run time can be arbitrary. Thus, we need to consider all possible phase combinations among jobs to find the worst case deadline miss probability, which is not tractable. To handle this difficulty, we first derive the worst case phase combination for harmonic task sets. Then, we present a safe way to transform a nonharmonic task set to a harmonic task set such that the deadline miss probabilities obtained with the worst case phase combination for the transformed harmonic task set are guaranteed to be worse than those for the original nonharmonic task set with all possible phase combinations. Therefore, the worst case deadline miss probabilities of the transformed harmonic tasks can be used as safe upper-bounds of deadline miss probabilities of the original nonharmonic tasks. Through experiments, we show that the safe upper-bound computed by the proposed analysis is tight enough for practical uses.
ISSN
0018-9340
Language
English
URI
http://hdl.handle.net/10371/10148
DOI
https://doi.org/10.1109/TC.2008.208
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Computer Science and Engineering (컴퓨터공학부)Journal Papers (저널논문_컴퓨터공학부)
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