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Effective I/O Processing with Exception-Less System Calls for Low-Latency Devices

Traditional media such as hard disk and NAND flash are low latency storage devices. I/Os from and to such devices are completed asynchronously via interrupts in most cases. However, introduction of ultra-low latency devices using next-generation non-volatile memory changes the appropriate way to complete I/O requests. Therefore, it is an awaiting solution to make better way to complete I/O requests for low-latency devices. We propose the novel approach to completes I/O requests effectively with exception-less system calls, which do not require software interrupts in issuing system calls. We implemented this approach, and evaluated the effect.