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December 2016

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RTEMS related articles where I would be happy for some opinion/sense from people stronger than me in scheduling theory
by Pavel Pisa 15 Dec '16

15 Dec '16

Hello everybody, there are three scheduling in real-time system related articles and two proposed changes for operating system which can have significant impact on RTEMS executive behavior. And the flawless behavior of RTEMS is important for future ESA and NASA missions for example. I do not have good feeling about the first proposed change described in next article. I think that it mixes the things. It does not consider/validate options to select EDF and CBS scheduler options implementation available in RTEMS mainline (code developed at our department) and I am not sure if burst of task to re-catch timing is good idea at all and it is common solution in theory and RTOSes Overrun Handling for Mixed-Criticality Support in RTEMS Kuan-Hsun Chen, Georg von der Bruggen, and Jian-Jia Chen Department of Informatics, TU Dortmund University, Germany http://ls12-www.cs.tu-dortmund.de/daes/media/documents/publications/downloa… Proposal for system changes https://devel.rtems.org/ticket/2795 The other change proposal is ticket https://devel.rtems.org/ticket/2556 Implement the O(m) Independence-Preserving Protocol (OMIP) Related articles A Fully Preemptive Multiprocessor Semaphore Protocol for Latency-Sensitive Real-Time Applications Bjorn B. Brandenburg Max Planck Institute for Software Systems (MPI-SWS) https://people.mpi-sws.org/~bbb/papers/pdf/ecrts13b.pdf A Schedulability Compatible Multiprocessor Resource Sharing Protocol - MrsP A. Burns and A.J. Wellings Department of Computer Science,University of York,York, YO10 5GH, UK http://www-users.cs.york.ac.uk/~burns/MRSPpaper.pdf I have no clue if it is change in good direction or not. I would expect that it is good idea because of theory authors and changes implementor but I like to be more convinced by other people stronger in theory. Best wishes, Pavel Pisa

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