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Prices of NAND flash memories are falling drastically due to market growthand fabrication process mastering while research efforts from a technologicalpoint of view in terms of endurance and density are very active. NAND flashmemories are becoming the most important storage media in mobile computing andtend to be less confined to this area. The major constraint of such atechnology is the limited number of possible erase operations per block whichtend to quickly provoke memory wear out. To cope with this issue,state-of-the-art solutions implement wear leveling policies to level the wearout of the memory and so increase its lifetime. These policies are integratedinto the Flash Translation Layer (FTL) and greatly contribute in decreasing thewrite performance. In this paper, we propose to reduce the flash memory wearout problem and improve its performance by absorbing the erase operationsthroughout a dual cache system replacing FTL wear leveling and garbagecollection services. We justify this idea by proposing a first performanceevaluation of an exclusively cache based system for embedded flash memories.Unlike wear leveling schemes, the proposed cache solution reduces the totalnumber of erase operations reported on the media by absorbing them in the cachefor workloads expressing a minimal global sequential rate.

A Cache Management Strategy to Replace Wear Leveling Techniques for Embedded Flash Memory