CoMem: Cooperative Memory Management for Real-Time Operation within Reactive Sensor/Actor Networks

Increasing complexity and modularity of today’s WSAN applications impose demanding challenges on the system design. This especially affects real-time operation, resource sharing and dynamic memory management. Preemptive task systems are one way to retain good reactivity within dynamic environments. Yet, since memory is often too rare for static assignment, this rapidly leads to severe compositional problems among tasks with interfering and even varying requirements. We present our novel CoMem approach for high reactivity and efficient memory usage in such systems. With respect to task priorities and the typically limited resources of sensor nodes, we facilitate compositional software design by providing tasks with runtime information for yet cooperative and self-reflective memory sharing. Thereby, we require no special hardware-support like MMUs but operate entirely software-based.