Suspend-aware Segment Cleaning in Log-structured File System

Authors: 

Dongil Park, Seungyong Cheon, and Youjip Won, Hanyang University

Abstract: 

The suspend feature of the modern smart device practically suppresses the background segment cleaning of the log-structured file system. In this work, we develop Suspend-aware Segment Cleaning for the log-structured file system. We seamlessly integrate the segment cleaning into the suspend module of the smartphone OS so that the log-structured file system can reclaim the free segments without interfering with the foreground user activity. The Suspend-aware Segment Cleaning consists of two key ingredients: (i) Virtual Segment Cleaning and (ii) Utilization-based Segment Cleaning. We implement Suspend-aware Segment Cleaning in commodity smartphone which uses the log-structured file system, F2FS, as its stock file system (Moto G). F2FS with Suspend-aware Segment Cleaning consolidates 6 more segments than stock smartphone does. With Suspend-aware Segment Cleaning, the F2FS consolidates 2 more segments even with suspend mode on than the case where the phone is always on.

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BibTeX
@inproceedings {190595,
author = {Dongil Park and Seungyong Cheon and Youjip Won},
title = {Suspend-aware Segment Cleaning in Log-structured File System},
booktitle = {7th USENIX Workshop on Hot Topics in Storage and File Systems (HotStorage 15)},
year = {2015},
address = {Santa Clara, CA},
url = {https://www.usenix.org/conference/hotstorage15/workshop-program/presentation/park},
publisher = {USENIX Association},
month = jul
}
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