Pattern Adaptive Data Buffering Scheme for SCM- based Memory-Storage System

New non-volatile memory devices can overcome DRAM’s high energy consumption, volatility, and the density scaling limit. By using these advantages, next generation nonvolatile memory devices can be a promising candidate replacing conventional memory devices such as DRAM. In this paper, we propose a pattern adaptive buffering management method for the superblock-based M-D (memory-disk) adapter that can be used for the SCM (storage class memory)-based memory-storage system merging conventional main memory layer and disk storage layer into a single memory layer. The superblock-based pattern adaptive buffering scheme can enhance spatial/temporal localities and optimize the data reusability. For selective locality management, a superblock is composed of several subblocks. These sub-blocks of a superblock are classified according to access counts using the filtering scheme to enhance the accessing performance and reusability for the M-D adapter structure. Experimental results show that the proposed adapter improves the buffer miss rate by about 57.8%. Keywords— Storage class memory; phase-change RAM; Dual Bugffers; hybrid memory;