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erofs: support to readahead dirent blocks in erofs_readdir()

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This patch supports to readahead more blocks in erofs_readdir(), it can
enhance readdir performance in large direcotry.

readdir test in a large directory which contains 12000 sub-files.

		files_per_second
Before:		926385.54
After:		2380435.562

Meanwhile, let's introduces a new sysfs entry to control readahead
bytes to provide more flexible policy for readahead of readdir().
- location: /sys/fs/erofs/<disk>/dir_ra_bytes
- default value: 16384
- disable readahead: set the value to 0

Signed-off-by: Chao Yu <chao@kernel.org>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250721021352.2495371-1-chao@kernel.org
[ Gao Xiang: minor styling adjustment. ]
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Chao Yu
2025-07-21 10:13:52 +08:00
committed by Gao Xiang
parent 414091322c
commit df0ce6cefa
5 changed files with 29 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-fs-erofs
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@@ -35,3 +35,11 @@ Description: Used to set or show hardware accelerators in effect
and multiple accelerators are separated by '\n'.
Supported accelerator(s): qat_deflate.
Disable all accelerators with an empty string (echo > accel).
What: /sys/fs/erofs/<disk>/dir_ra_bytes
Date: July 2025
Contact: "Chao Yu" <chao@kernel.org>
Description: Used to set or show readahead bytes during readdir(), by
default the value is 16384.
- 0: disable readahead.