Working-set-based address mapping for ultra-large-scaled flash devices

  • Authors:

  • Ming-Chang Yang;Yuan-Hao Chang;Po-Chun Huang;Tei-Wei Kuo

  • Affiliations:

  • Graduate Institute of Networking and Multimedia, National Taiwan University, Taipei, Taiwan Roc;Institute of Information Science, Academia Sinica, Taipei, Taiwan Roc;Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan Roc;Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan Roc

  • Venue:
  • Proceedings of the eighth IEEE/ACM/IFIP international conference on Hardware/software codesign and system synthesis
  • Year:
  • 2012

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Abstract

Address mapping for flash devices has been a challenging design problem for controllers because of the rapidly growing device capacity. Different from the past work, a capacity-independent address mapping scheme that only depends on users' access data set, referred to as working set, is proposed. As a result, fine-grained address mapping is achieved with significant performance boosting, compared to the past work. In addition, a simple but practical wear-leveling design is proposed with the capability in lifetime estimation of flash devices. The proposed scheme was evaluated by a series of experiments with encouraging results.