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On Adaptive Hierarchical Scheduling of Real-time Systems Using a Feedback Controller

Fulltext:


Authors:

Nima Khalilzad, Moris Behnam, Thomas Nolte, Mikael Åsberg

Research group:

Complex Real-Time Embedded Systems

Publication Type:

Conference/Workshop Paper

Venue:

3rd Workshop on Adaptive and Reconfigurable Embedded Systems (APRES11)

Abstract

Hierarchical scheduling provides predictable timing and temporal isolation; two properties desirable in real-time embedded systems. In hierarchically scheduled systems, subsystems should receive a sufficient amount of CPU resources in order to be able to guarantee timing constraints of its internal parts (tasks). In static systems, an exact amount of CPU resource can be allocated to a subsystem. However, in dynamic systems, where execution times of tasks vary considerably during runtime, it is desirable to give a dynamic portion of the CPU given the current load situation. In this paper we present a feedback control approach for adapting the amount of CPU resource that is allocated to subsystems during run-time such that each subsystem receives sufficient resources while keeping the number of deadline violations to a minimum. We also show an example simulation where the controller adapts the budget of a subsystem.

Bibtex

@inproceedings{Khalilzad2053,
author = {Nima Khalilzad and Moris Behnam and Thomas Nolte and Mikael {\AA}sberg},
title = {On Adaptive Hierarchical Scheduling of Real-time Systems Using a Feedback Controller},
month = {April},
year = {2011},
booktitle = {3rd Workshop on Adaptive and Reconfigurable Embedded Systems (APRES11)},
url = {http://www.es.mdu.se/publications/2053-}
}