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Considerations on the Least Upper Bound for Mixed-Criticality Real-Time Systems
Ref: CISTER-TR-151102       Publication Date: 3 to 6, Nov, 2015

Considerations on the Least Upper Bound for Mixed-Criticality Real-Time Systems

Ref: CISTER-TR-151102       Publication Date: 3 to 6, Nov, 2015

Abstract:
Real-time mixed-criticality systems (MCS) are designed so that tasks with different criticality levels share the same computing platform. Scheduling mechanisms must ensure that high criticality tasks are safe independently of lower criticality tasks? behaviour. In this paper we provide theoretical schedulability properties for MCS by showing that: (a) the least upper bound on processor utilisation of MCS is in general null for both uniprocessor and multiprocessor platforms; (b) this bound lies in interval [ln 2, 2 (sqrt(2)−1)] if higher criticality tasks do not have periods larger than lower criticality ones; and (c) if the task of these uniprocessor systems have harmonic periods, the least upper bound reaches 1.

Authors:
José Augusto Santos Jr
,
George Lima
,
Konstantinos Bletsas


5th Brazilian Symposium on Computing Systems Engineering, SBESC 2015 (SBESC 2015).
Foz do Iguaçu, Brasil.



Record Date: 11, Nov, 2015