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| author | Daeho Jeong <daehojeong@google.com> | 2021-08-02 21:22:45 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2021-08-03 11:16:22 -0700 |
| commit | 0f6b56ec958d49e2b3dc955cdac6b62702c04b72 (patch) | |
| tree | 7d6b246158ca89612e6004bf773fa1224a87d5ac /Documentation/ABI | |
| parent | 4f993264fe2965c344f223d854ccbb549b16ed71 (diff) | |
| download | linux-0f6b56ec958d49e2b3dc955cdac6b62702c04b72.tar.bz2 | |
f2fs: add sysfs node to control ra_pages for fadvise seq file
fadvise() allows the user to expand the readahead window to double with
POSIX_FADV_SEQUENTIAL, now. But, in some use cases, it is not that
sufficient and we need to meet the need in a restricted way. We can
control the multiplier value of bdi device readahead between 2 (default)
and 256 for POSIX_FADV_SEQUENTIAL advise option.
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-f2fs | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 845c4be535b0..73211f77d11e 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -507,3 +507,9 @@ Date: July 2021 Contact: "Daeho Jeong" <daehojeong@google.com> Description: You can control for which gc mode the "gc_reclaimed_segments" node shows. Refer to the description of the modes in "gc_reclaimed_segments". + +What: /sys/fs/f2fs/<disk>/seq_file_ra_mul +Date: July 2021 +Contact: "Daeho Jeong" <daehojeong@google.com> +Description: You can control the multiplier value of bdi device readahead window size + between 2 (default) and 256 for POSIX_FADV_SEQUENTIAL advise option. |