linux-next

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History

Gao Xiang 6422cde1b0 erofs: use buffered I/O for file-backed mounts by default

For many use cases (e.g. container images are just fetched from remote),
performance will be impacted if underlay page cache is up-to-date but
direct i/o flushes dirty pages first.

Instead, let's use buffered I/O by default to keep in sync with loop
devices and add a (re)mount option to explicitly give a try to use
direct I/O if supported by the underlying files.

The container startup time is improved as below:
[workload] docker.io/library/workpress:latest
                                     unpack        1st run  non-1st runs
EROFS snapshotter buffered I/O file  4.586404265s  0.308s   0.198s
EROFS snapshotter direct I/O file    4.581742849s  2.238s   0.222s
EROFS snapshotter loop               4.596023152s  0.346s   0.201s
Overlayfs snapshotter                5.382851037s  0.206s   0.214s

Fixes: fb176750266a ("erofs: add file-backed mount support")
Cc: Derek McGowan <derek@mcg.dev>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20241212134336.2059899-1-hsiangkao@linux.alibaba.com

2024-12-16 21:02:07 +08:00

compress.h

erofs: avoid refcounting short-lived pages

2024-07-11 15:14:26 +08:00

data.c

erofs: reference struct erofs_device_info for erofs_map_dev

2024-12-16 21:02:06 +08:00

decompressor_deflate.c

erofs: tidy up stream decompressors

2024-07-09 19:04:41 +08:00

decompressor_lzma.c

erofs: convert comma to semicolon