Paper Info
Title
UMFS: An efficient user-space file system for non-volatile memory.
Abstract
Emerging non-volatile memory (NVM) is expected to be a mainstream storage media in embedded systems for its low-power consumption, near-DRAM speed, high density, and byte-addressability. In-memory file systems are proposed to achieve high-performance file accesses by storing files in NVM. Existing in-memory file systems, such as NOVA and EXT4-DAX, operate in kernel space and have additional overhead caused by kernel layers and mode change. In this paper, we propose a new design of User-space in-Memory File System (UMFS) to improve file access speed by minimizing the overhead of kernel. We implement UMFS in Linux system to verify the proposed design. In open operation, UMFS exposes a file into user-space in constant time independent from the file size. Then, UMFS can achieve high-performance file accesses taking advantages of user virtual address space and existing address translation hardware in processors. We also propose an efficient user-space journaling to ensure data consistency while minimizing kernel cost. Extensive experiments are conducted on standard benchmarks to compare UMFS with NOVA, EXT4-DAX, and SIMFS, the state-of-the-art in-memory file system. The experimental results show that UMFS outperforms any of existing in-memory file systems.
Year
DOI
Venue
2018
10.1016/j.sysarc.2018.04.004
Journal of Systems Architecture
Keywords
Field
DocType
Non-volatile memory,In-memory file systems,Virtual address space,User space direct I/O,Performance
Kernel (linear algebra),File system,Computer science,Parallel computing,Virtual address space,File size,Journaling file system,Non-volatile memory,User space,Operating system,Data consistency
Journal
Volume
ISSN
Citations 
89
1383-7621
1
PageRank 
References 
Authors
0.35
26
7
Name
Order
Citations
PageRank
Xianzhang Chen16817.61
Edwin Hsing-Mean Sha2244.58
Qingfeng Zhuge3396.27
ting wu43916.80
Weiwen Jiang59516.21
Xiaoping Zeng623629.69
Lin Wu773.50