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OSPERT 2009 : International Workshop on Operating Systems Platforms for Embedded Real-Time Applications

Fixed-Priority Scheduling with Deferred Preemption (FPDS) is a middle ground between Fixed-Priority Preemptive Scheduling and Fixed-Priority Non-preemptive Scheduling, and offers advantages with respect to context switch overhead and resource access control. In this paper we present our work on extending the realtime operating system RTAI/Linux with support for FPDS. We give an overview of possible alternatives, describe our design choices and implementation, and verify through a series of measurements that indicate that a FPDS implementation in a real-world RTOS is feasible with minimal overhead.