Quantitative Analysis and Systematic Parametrization of a Two-Level Real-Time Scheduler

The computational power of embedded systems have increased steadily during the recent years. In contrast to former approaches which allowed at least one application per computational node the memory size and computational power of today allows to host more than one application per node. Often applications are delivered by suppliers as a whole including the operating systems where the application tasks run on top. In this case virtualizanon is a common software approach to maintain isolation between different applications on the same computation system. Virtual machine monitors are able to divide the resources of a physical system into several logical subsystems. However, those monitors which are available today do not focus on the preservation of real-time properties. Consequently, our working group develops and investigates a two-level hierarchy of real-time schedulers, where a global scheduler assigns temporal resources to guest systems, while each subsystem has its own local scheduler for its application tasks.