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| author | Chao Yu <chao2.yu@samsung.com> | 2015-10-12 11:08:48 +0200 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-10-12 23:03:43 +0200 |
| commit | ea1a29a0bdfffd56ca98335c0655308e8d7d0e22 (patch) | |
| tree | 15cff3be22c03ada0cb3e5936b73ed1451645176 /Documentation/ABI | |
| parent | f2fs: readahead for free nids building (diff) | |
| download | linux-ea1a29a0bdfffd56ca98335c0655308e8d7d0e22.tar.xz linux-ea1a29a0bdfffd56ca98335c0655308e8d7d0e22.zip | |
f2fs: export ra_nid_pages to sysfs
After finishing building free nid cache, we will try to readahead
asynchronously 4 more pages for the next reloading, the count of
readahead nid pages is fixed.
In some case, like SMR drive, read less sectors with fixed count
each time we trigger RA may be low efficient, since we will face
high seeking overhead, so we'd better let user to configure this
parameter from sysfs in specific workload.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
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 e066281dfd4e..0345f2d1c727 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -86,3 +86,9 @@ Date: October 2015 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org> Description: Controls the checkpoint timing. + +What: /sys/fs/f2fs/<disk>/ra_nid_pages +Date: October 2015 +Contact: "Chao Yu" <chao2.yu@samsung.com> +Description: + Controls the count of nid pages to be readaheaded. |