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An integrated memory-disk system with buffering adapter and non-volatile memory
Next generation non-volatile memory devices are promising replacements for DRAM and Flash memories for mobile devices because of their energy efficiency and nonvolatile characteristics. In this paper, we propose a new memory hierarchy system for nextgeneration non-volatile memory devices that is called an integrated memory-disk (IM-D) structure. It can merge a conventional main memory layer and a disk storage layer into a single memory layer using Phase change memory (PCM) and Flash memories. The IM-D architecture, consisting of a dual buffering IM-D adapter to improve the limited endurance and latencies, an array of PCM/Flash hybrid memories, and an associated memory management module called the IM-D translation layer in the operating system, is designed to utilize the advantages of next-generation non-volatile memory devices and at the same time overcome some shortcomings, like the asymmetric read/write access latencies and limited endurance, of a conventional memory hierarchy system. In the IM-D architecture, we propose an array of PCM/Flash hybrid memories and a migration scheme to enhance the cost effective performance and to reduce access latency. Our experimental results show that the missrateoftheproposedIM-Dadapterisreducedby49%ascomparedwiththeconventional memory module, and the write count is reduced by 60.15%. In addition, the access latency of the IM-D storage is improved by 45.3%.
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