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Response time analysis of multiframe mixed-criticality systems
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Resumo(s)
The well-known model of Vestal aims to avoid excessive pessimism
in the quantification of the processing requirements of mixedcriticality systems, while still guaranteeing the timeliness of highercriticality functions. This can bring important savings in system
costs, and indirectly help meet size, weight and power constraints.
This efficiency is promoted via the use of multiple worst-case execution time (WCET) estimates for the same task, with each such
estimate characterised by a confidence associated with a different criticality level. However, even this approach can be very pessimistic when the WCET of successive instances of the same task
can vary greatly according to a known pattern, as in MP3 and MPEG
codecs or the processing of ADVB video streams.
In this paper, we present a schedulability analysis for the multiframe mixed-criticality model, which allows tasks to have multiple, periodically repeating, WCETs in the same mode of operation. Our work extends both the analysis techniques for Static
Mixed-Cricality scheduling (SMC) and Adaptive Mixed-Criticality
scheduling (AMC), on one hand, and the schedulability analysis
for multiframe task systems on the other. Our proposed worst-case
response time (WCRT) analysis for multiframe mixed-criticality
systems is considerably less pessimistic than applying the SMC,
AMC-rtb and AMC-max tests obliviously to the WCET variation
patterns. Experimental evaluation with synthetic task sets demonstrates up to 63.8% higher scheduling success ratio (in absolute
terms) compared to the best of the frame-oblivious tests
Descrição
Outstanding paper award
RTNS '19: Proceedings of the 27th International Conference on Real-Time Networks and Systems - November 2019
RTNS '19: Proceedings of the 27th International Conference on Real-Time Networks and Systems - November 2019
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Contexto Educativo
Citação
Editora
Association for Computing Machinery