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Design and Implementation of MODA Allocation Scheme based on Analysis of Block Cleaning Cost  

Baek, Seung-Jae (단국대학교 정보컴퓨터과학과)
Choi, Jong-Moo (단국대학교 정보컴퓨터과학과)
Publication Information
Journal of KIISE:Computer Systems and Theory / v.34, no.11, 2007 , pp. 599-609 More about this Journal
Abstract
Due to the restrictions of Flash memory such as overwrite limitation and write/erase operational unit differences, block cleaning is required in Flash memory based file systems and known as a key factor on the performance of file systems. In this paper, we identify three parameters, namely utilization, invalidity and uniformity, and analyze how the parameters affect the cost of block cleaning. The analysis show that as uniformity degrades, the cost of block cleaning increases drastically. To overcome this problem, we design a new modification-aware(MODA) page allocation scheme that strives to keep uniformity high by separating frequently-updating data from infrequently-updating data. Real implementation experiments conducted on an embedded system show that the MODA scheme can actually enhance uniformity of Flash memory, which consequently leads to reduce the cost of block cleaning with an average of 123%, compared to the traditional sequential allocation scheme that is used in YAFFS.
Keywords
Flash memory; File System; Block Cleaning; Uniformity; Page Allocation;
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Times Cited By KSCI : 1  (Citation Analysis)
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