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Non-preemptive Multitasking on FPGAs: Task Placement and Footprint Transform

Partial reconfiguration allows for mapping and executing several tasks on an FPGA during runtime. Multitasking on FPGAs rises a number of questions on the management of the reconfigurable resource, which leads to concepts of reconfigurable operating systems. This paper focuses on a major aspect of a reconfigurable operating system: task placement and transformation. We first discuss task characteristics and system models, and then concentrate on the execution of independent task sets on non-preemptive reconfigurable systems. We investigate placement techniques for non-rectangular, coarsegrained tasks and propose footprint transforms that change task shapes in order to find possible mappings. Finally, we discuss simulation experiments to evaluate these techniques.