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Decoupling Criticality and Importance in Mixed-Criticality Scheduling
Ref: CISTER-TR-181119       Publication Date: 11, Dec, 2018

Decoupling Criticality and Importance in Mixed-Criticality Scheduling

Ref: CISTER-TR-181119       Publication Date: 11, Dec, 2018

Abstract:
Research on mixed-criticality scheduling has flourished since Vestal’s seminal 2007 paper, but more efforts are needed in order to make these results more suitable for industrial adoption and robust and versatile enough to influence the evolution of future certification standards in keeping up with the times. With this in mind, we introduce a more refined task model, in line with the fundamental principles of Vestal’s mode-based adaptive mixed-criticality model, which allows a task’s criticality and its importance to be specified independently from each other. A task’s importance is the criterion that determines its presence in different system modes. Meanwhile, the task’s criticality (reflected in its Safety Integrity Level (SIL) and defining the rules for its software development process), prescribes the degree of conservativeness for the task’s estimated WCET during schedulability testing. We indicate how such a task model can help resolve some of the perceived weaknesses of the Vestal model, in terms of how it is interpreted, and demonstrate how the existing scheduling tests for the classic variant’s of Vestal’s model can be mapped to the new task model essentially without changes.

Authors:
Konstantinos Bletsas
,
Muhammad Ali Awan
,
Pedro Souto
,
Benny Åkesson
,
Alan Burns
,
Eduardo Tovar


Events:

WMC 2018
11, Dec, 2018
6th International Workshop on Mixed Criticality Systems
Nashville, U.S.A.


6th International Workshop on Mixed Criticality Systems (WMC 2018), pp 25-30.
Nashville, U.S.A..

Notes: WMC 2018 is held as part of RTSS 2018, Nashville, USA, 11-14 December.



Record Date: 8, Nov, 2018