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Defuse: Decoupling Metadata and Data Processing in FUSE Framework for Performance Improvement

Authors :
Wenrui Yan
Jie Yao
Qiang Cao
Source :
IEEE Access, Vol 7, Pp 138473-138484 (2019)
Publication Year :
2019
Publisher :
IEEE, 2019.

Abstract

A popular user-space file system framework, FUSE, has been widely used for building various customized file systems (cFS) on top of the underlying kernel file system (kFS). A FUSE-based cFS gains adequate flexibility by developing its specific functions in user space, but brings extra user-kernel mode switches in the request processing flow owing to forwarding all requests from the FUSE kernel driver to the user-space daemon, thus degrading the overall performance. We observe that a file data request does not need to forward to the user-space daemon when its file-to-file mapping between the FUSE-based cFS and the underlying kFS remains unchanged. Based on the insight, we propose a modified FUSE framework - DeFUSE that decouples the processing flow of the metadata and data requests. The metadata requests still follow the original flow to reserve flexibility while the data requests are directly executed in the DeFUSE kernel driver maintaining the file-to-file mappings in the kernel, effectively eliminating the unnecessary mode switches. We have implemented the DeFUSE framework and ported three representative FUSE-based cFSs to DeFUSE. The result shows that for data-centric workloads, the throughput of DeFUSE-based cFSs increases up to 3.5X for write and 3.8X for read respectively, compared to their corresponding FUSE-based implementations. DeFUSE is available on Github.

Details

Language :
English
ISSN :
21693536
Volume :
7
Database :
Directory of Open Access Journals
Journal :
IEEE Access
Publication Type :
Academic Journal
Accession number :
edsdoj.9e810d6fbf5f494d97dd6b6df68c7331
Document Type :
article
Full Text :
https://doi.org/10.1109/ACCESS.2019.2942954