Validating timing constraints in multiprocessor and distributed real-time systems
Validating timing constraints in multiprocessor and distributed real-time systems
Validating timing constraints in multiprocessor and distributed systems
Validating timing constraints in multiprocessor and distributed systems
Power-Aware Scheduling for Periodic Real-Time Tasks
IEEE Transactions on Computers
Preemptive Scheduling of Multi-criticality Systems with Varying Degrees of Execution Time Assurance
RTSS '07 Proceedings of the 28th IEEE International Real-Time Systems Symposium
RTCSA '09 Proceedings of the 2009 15th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications
On the Scheduling of Mixed-Criticality Real-Time Task Sets
RTSS '09 Proceedings of the 2009 30th IEEE Real-Time Systems Symposium
New Response Time Bounds for Fixed Priority Multiprocessor Scheduling
RTSS '09 Proceedings of the 2009 30th IEEE Real-Time Systems Symposium
Load-based schedulability analysis of certifiable mixed-criticality systems
EMSOFT '10 Proceedings of the tenth ACM international conference on Embedded software
An Algorithm for Scheduling Certifiable Mixed-Criticality Sporadic Task Systems
RTSS '10 Proceedings of the 2010 31st IEEE Real-Time Systems Symposium
Mixed-Criticality Task Synchronization in Zero-Slack Scheduling
RTAS '11 Proceedings of the 2011 17th IEEE Real-Time and Embedded Technology and Applications Symposium
Mixed-criticality scheduling of sporadic task systems
ESA'11 Proceedings of the 19th European conference on Algorithms
Effective and Efficient Scheduling of Certifiable Mixed-Criticality Sporadic Task Systems
RTSS '11 Proceedings of the 2011 IEEE 32nd Real-Time Systems Symposium
Response-Time Analysis for Mixed Criticality Systems
RTSS '11 Proceedings of the 2011 IEEE 32nd Real-Time Systems Symposium
Schedulability Analysis of Mixed-Criticality Systems on Multiprocessors
ECRTS '12 Proceedings of the 2012 24th Euromicro Conference on Real-Time Systems
The Preemptive Uniprocessor Scheduling of Mixed-Criticality Implicit-Deadline Sporadic Task Systems
ECRTS '12 Proceedings of the 2012 24th Euromicro Conference on Real-Time Systems
Relaxing Mixed-Criticality Scheduling Strictness for Task Sets Scheduled with FP
ECRTS '12 Proceedings of the 2012 24th Euromicro Conference on Real-Time Systems
Outstanding Paper Award: Global Mixed-Criticality Scheduling on Multiprocessors
ECRTS '12 Proceedings of the 2012 24th Euromicro Conference on Real-Time Systems
An elastic mixed-criticality task model and its scheduling algorithm
Proceedings of the Conference on Design, Automation and Test in Europe
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Most of the existing research on multiprocessor mixed-criticality scheduling has focused on ensuring schedulability of the task set when the criticality level of the system increases. Furthermore, upon increasing the criticality level, most of these scheduling approaches suspend the execution of the lower criticality tasks in order to guarantee the schedulability of the higher criticality tasks. Although there exists a couple of approaches to facilitate the execution of some of the lower criticality tasks using the available slack in the system, to the best of our knowledge, there is no efficient mechanism that allows for eventually decreasing the criticality level of the system in order to resume the execution of the suspended lower criticality tasks. We refer to the problem of deciding when and how to lower the criticality level of the system as the "Safe Criticality Reduction" (SCR) problem. In this work, we design two solutions that are independent of the number of criticality levels and the number of processors and prove their correctness. The first protocol can be applied to any fixed task priority scheduler, and an upper-bound on the suspension delay suffered by the lower criticality tasks is presented. The second protocol can be applied to any fixed job priority scheduler and hence dominates the first protocol albeit with a higher run-time overhead. To the best of our knowledge, these are the first solutions for the SCR problem on multiprocessor platforms.