Response Time Analysis for Tasks Scheduled under EDF within Fixed Priorities

  • Authors:
  • M. González Harbour;J. C. Palencia

  • Affiliations:
  • -;-

  • Venue:
  • RTSS '03 Proceedings of the 24th IEEE International Real-Time Systems Symposium
  • Year:
  • 2003

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Abstract

Hierarchical schedulers are getting increased attention inmany research projects because they bring in flexibility,they can take advantage of the best features of differentscheduling policies, and allow the composability of applicationsdeveloped under different scheduling strategies. Mostcommercial real-time operating systems have an underlyingfixed priority scheduler, and for this reason it is necessaryto be able to analyze hierarchically-scheduled applicationsin which the underlying scheduler is of that kind. In this paperwe extend the classic response time analysis techniquesto analyze applications which can have a mixture of tasksscheduled either with fixed priorities, or with an earliestdeadline first (EDF) scheduler running on top of an underlyingfixed priority scheduler. We show that the complexityof this analysis is similar to that of existing response timeanalysis for EDF tasks.