OSDI文章分享，论文（CrossFS: A Cross-layered Direct-Access File System）的结构化文摘

原创于 2021-06-21 20:02:25 发布 · 311 阅读

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#操作系统 #内核 #硬件 #层次模型

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CrossFS是一种跨用户级、固件级和内核级的分布式文件系统，旨在提升I/O性能并增强并发性。通过利用主机和设备级计算能力，CrossFS实现了基于文件描述符的并发控制，将每个文件描述符映射到独立的硬件I/O队列，以实现并发处理。同时，它使用主机CPU进行并发控制，并利用非易失性内存确保跨层设计的崩溃一致性。此外，CrossFS还设计了一种固件级I/O调度器来高效分发文件描述符请求。评估表明，与最新内核、用户级和固件文件系统相比，CrossFS在基准测试中并发访问性能提高了4.87倍，在实际应用中提高了2.32倍。

Authors:

Yujie Ren, Rutgers University; Changwoo Min, Virginia Tech; Sudarsun Kannan, Rutgers University

Abstract:

We design CrossFS, a cross-layered direct-access file system disaggregated across user-level, firmware, and kernel layers for scaling I/O performance and improving concurrency. CrossFS is designed to exploit host- and device-level compute capabilities. For concurrency with or without data sharing across threads and processes, CrossFS introduces a file descriptor-based concurrency control that maps each file descriptor to one hardware-level I/O queue. This design allows CrossFS’s firmware component to process disjoint access across file descriptors concur