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Design and implementation of a uniformity-improving page allocation scheme for flash-based storage systems

机译：基于闪存的存储系统的统一性提高页面分配方案的设计和实现

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摘要

Flash memory is being actively employed in a variety of embedded systems such as digital cameras, MP3 players, cell phones, solid state disks (SSDs), and digital media broadcasting (DMB) devices. This paper considers performance issues in file systems that employ Flash memory as a storage medium. Firstly, it explores the characteristics of Flash memory and identifies the cost of block cleaning as the key performance bottleneck for Flash memory analogous to the seek time in disk storage. Then, it defines three performance parameters, namely, utilization, invalidity, and uniformity and derives a formula for block cleaning cost based on these parameters. It is shown that, of these parameters, uniformity exerts the strongest influence on the cost of cleaning and that uniformity is a file system controllable parameter. Finally, we design a uniformity-aware page allocation scheme and analyze how enhanced uniformity affects the block cleaning cost with various workloads. Real implementation experiments conducted on an embedded system show that the scheme proposed here typically reduces the cleaning time by 20 to 30% compared to the traditional sequential allocation scheme that is used in YAFFS.
机译：闪存正在各种嵌入式系统中积极使用，例如，数码相机，MP3播放器，手机，固态磁盘（SSD）和数字媒体广播（DMB）设备。本文考虑了采用闪存作为存储介质的文件系统中的性能问题。首先，它探讨了闪存的特性，并将块清理的成本确定为类似于磁盘存储查找时间的闪存关键性能瓶颈。然后，它定义了三个性能参数，即利用率，无效性和均匀性，并基于这些参数得出了块清洁成本的公式。结果表明，在这些参数中，均匀性对清洁成本影响最大，并且均匀性是文件系统可控制的参数。最后，我们设计了一个可识别均匀性的页面分配方案，并分析了增强的均匀性如何影响各种工作负载下的块清洁成本。在嵌入式系统上进行的实际实施实验表明，与YAFFS中使用的传统顺序分配方案相比，此处提出的方案通常可将清洗时间减少20％到30％。

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