Towards Real Multi-criticality Scheduling

Componentised systems, in particular those with fault confinement through address spaces, are currently emerging as a hot topic in embedded systems research. This paper extends the unified rate-based scheduling framework RBED in several dimensions to fit the requirements of such systems: we have rem...

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Bibliographic Details
Main Authors: Petters, S.M., Lawitzky, M., Heffernan, R., Elphinstone, K.
Format: Conference Proceeding
Language:English
Subjects:
Added delay
Australia
components
Computer applications
Embedded computing
Embedded system
implementation
microkernel
Mobile handsets
Open systems
Processor scheduling
Protection
Real time systems
real-time
temporal isolation
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Summary:Componentised systems, in particular those with fault confinement through address spaces, are currently emerging as a hot topic in embedded systems research. This paper extends the unified rate-based scheduling framework RBED in several dimensions to fit the requirements of such systems: we have removed the requirement that the deadline of a task is equal to its period. The introduction of inter-process communication reflects the need to communicate. Additionally we also discuss server tasks, budget replenishment and the low level details needed to deal with the physical reality of systems. While a number of these issues have been studied in previous work in isolation, we focus on the problems discovered and lessons learned when integrating solutions. We report on our experiences implementing the proposed mechanisms in a commercial grade OKL4 microkernel as well as an application with soft real-time and best-effort tasks on top of it.
ISSN:2325-1271
DOI:10.1109/RTCSA.2009.24