License: Creative Commons Attribution 3.0 Unported license (CC BY 3.0)
When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.ISAAC.2020.65
URN: urn:nbn:de:0030-drops-134092
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Onodera, Taku ; Shibuya, Tetsuo

Wear Leveling Revisited

LIPIcs-ISAAC-2020-65.pdf (0.5 MB)


Wear leveling - a technology designed to balance the write counts among memory cells regardless of the requested accesses - is vital in prolonging the lifetime of certain computer memory devices, especially the type of next-generation non-volatile memory, known as phase change memory (PCM). Although researchers have been working extensively on wear leveling, almost all existing studies mainly focus on the practical aspects and lack rigorous mathematical analyses. The lack of theory is particularly problematic for security-critical applications. We address this issue by revisiting wear leveling from a theoretical perspective.
First, we completely determine the problem parameter regime for which Security Refresh - one of the most well-known existing wear leveling schemes for PCM - works effectively by providing a positive result and a matching negative result. In particular, Security Refresh is not competitive for the practically relevant regime of large-scale memory. Then, we propose a novel scheme that achieves better lifetime, time/space overhead, and wear-free space for the relevant regime not covered by Security Refresh. Unlike existing studies, we give rigorous theoretical lifetime analyses, which is necessary to assess and control the security risk.

BibTeX - Entry

  author =	{Taku Onodera and Tetsuo Shibuya},
  title =	{{Wear Leveling Revisited}},
  booktitle =	{31st International Symposium on Algorithms and Computation (ISAAC 2020)},
  pages =	{65:1--65:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-173-3},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{181},
  editor =	{Yixin Cao and Siu-Wing Cheng and Minming Li},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{},
  URN =		{urn:nbn:de:0030-drops-134092},
  doi =		{10.4230/LIPIcs.ISAAC.2020.65},
  annote =	{Keywords: Wear leveling, Randomized algorithm, Non-volatile memory}

Keywords: Wear leveling, Randomized algorithm, Non-volatile memory
Collection: 31st International Symposium on Algorithms and Computation (ISAAC 2020)
Issue Date: 2020
Date of publication: 04.12.2020

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