Migration between Software and Hardware Task on Preemptive Multitasking CPU/FPGA Hybrid Architecture

As the CPU/FPGA hybrid architecture becomes one of the most important forms, the research of the schedule on hybrid tasks is a hot-spot. The schedule approaches of hybrid tasks can be classified into two categories. One is about non-preemptive multitasking, the other is preemptive multitasking. For the second one, as it requires architecture support, the existing researches are fewer. This paper presents an architecture which supports preemptive multitasking, an algorithm to select the appropriate migration point and a new schedule algorithm based migration and also introduces naming service to deal with communication problems after tasks migrated. Experimental results show that the algorithm based migration increases acceptance rate for hardware tasks to 12.94\%.The architecture proposed can support the preempting well, and improve the performance.