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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2025-01-31 22:27:57 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-12-18 13:55:15 +0100 |
| commit | 9933e05f508e08ff9054d859c6736234f8d3700f (patch) | |
| tree | 244524900b972e758b2ff069472efa1e5ab4441f /Documentation | |
| parent | 58ecedab080c41b7ecbb9f38d81d35a169738b82 (diff) | |
| download | linux-9933e05f508e08ff9054d859c6736234f8d3700f.tar.gz linux-9933e05f508e08ff9054d859c6736234f8d3700f.tar.bz2 linux-9933e05f508e08ff9054d859c6736234f8d3700f.zip | |
f2fs: add a sysfs entry to reclaim POSIX_FADV_NOREUSE pages
[ Upstream commit a907f3a68ee26ba493a08a958809208d17f3347e ]
1. fadvise(fd1, POSIX_FADV_NOREUSE, {0,3});
2. fadvise(fd2, POSIX_FADV_NOREUSE, {1,2});
3. fadvise(fd3, POSIX_FADV_NOREUSE, {3,1});
4. echo 1024 > /sys/fs/f2fs/tuning/reclaim_caches_kb
This gives a way to reclaim file-backed pages by iterating all f2fs mounts until
reclaiming 1MB page cache ranges, registered by #1, #2, and #3.
5. cat /sys/fs/f2fs/tuning/reclaim_caches_kb
-> gives total number of registered file ranges.
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-f2fs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 3e1630c70d8a..81deae2af84d 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -828,3 +828,10 @@ Date: November 2024 Contact: "Chao Yu" <chao@kernel.org> Description: It controls max read extent count for per-inode, the value of threshold is 10240 by default. + +What: /sys/fs/f2fs/tuning/reclaim_caches_kb +Date: February 2025 +Contact: "Jaegeuk Kim" <jaegeuk@kernel.org> +Description: It reclaims the given KBs of file-backed pages registered by + ioctl(F2FS_IOC_DONATE_RANGE). + For example, writing N tries to drop N KBs spaces in LRU. |