Providing Configurable QoS Management in Real-Time Systems with QoS Aspect Packages

Abstract

Current quality of service (QoS) management approaches in real-time systems lack support for configurability and reusability as they cannot be configured for a target application or reused across many applications. In this paper we present the concept of a QoS aspect package that enables developing configurable QoS management for real-time systems. A QoS aspect package represents both the specification and the implementation of a set of aspects and components that provide a number of QoS policies. A QoS aspect package enables upgrades of already existing systems to support QoS performance assurance by adding aspects and components from the package. Furthermore, a family of realtime systems can easily be developed by adding aspects from the QoS aspect package into an existing system configuration. We illustrate the way a family of real-time database systems is developed using the QoS aspect package with a case study of an embedded real-time database system, called COMET. Our experiments with the COMET database have shown that it is indeed possible to design a real-time system without QoS management and then with a reasonable effort add the QoS dimension to the system using a QoS aspect package.

Interrupt synchronization in the CiAO operating system

“…Other related work targets infrastructure software for embedded systems in a broader sense, namely aspects of middleware [15,8] and quality of service in embedded real time database applications [12].…”

Evolving embedded product lines

“…This could be a difficult task given that it is often the case that components need to maintain their black box behavior. A possibility would be to explicitly declare aspect-variation points in the components where the weaving can be done, e.g., as proposed in [10,9] for a different domain. Of course, it would also be useful to be able to detect and extract already existing crosscuttings from the reusable components into aspects.…”