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Optimised Linux swap system for flash memory

Optimised Linux swap system for flash memory

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Proposed is an optimised Linux swap system, called SGBI, where the Linux kernel manages the flash memory-based swap area directly without FTL. This approach not only introduces an efficient swap-aware garbage collection policy to reduce its cleaning cost and improve the degree of wear-levelling, but also adopts an efficient swap-in read-ahead scheme to delay the execution of garbage collection. Swap I/O traces from the Linux kernel have been collected and trace-driven simulations performed, which show that the proposed approach greatly outperforms existing Linux swap systems.

References

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      • Kwon, O., Koh, K.: `Swap-aware garbage collection for NAND flash memory based embedded systems', Proc. 7th IEEE Int. Conf. on Computer and Information Technology, 2007, Dhaka, Bangladesh.
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      • Kawaguchi, A., Nishioka, S., Motoda, H.: `A flash memory based file system', Proc. 1995 USENIX Tech. Conf., New Orleans, LA, USA, p. 155–164.
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