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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2024-04-17 20:01:55 +0000 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2024-04-19 17:56:13 +0000 |
| commit | 7643f3fe27729b20e6fcf6b314b00b8b93504356 (patch) | |
| tree | 42ef1e80c57a604345d02f4d8fd3c07b02573e9b /Documentation/filesystems/f2fs.rst | |
| parent | b2cf5a1ff236fcd0eb9dcbb188df30b50bb1af0f (diff) | |
f2fs: assign the write hint per stream by default
This reverts commit 930e2607638d ("f2fs: remove obsolete whint_mode"), as we
decide to pass write hints to the disk.
Cc: Hyunchul Lee <cheol.lee@lge.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'Documentation/filesystems/f2fs.rst')
| -rw-r--r-- | Documentation/filesystems/f2fs.rst | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst index efc3493fd6f8..68a0885fb5e6 100644 --- a/Documentation/filesystems/f2fs.rst +++ b/Documentation/filesystems/f2fs.rst @@ -774,6 +774,35 @@ In order to identify whether the data in the victim segment are valid or not, F2FS manages a bitmap. Each bit represents the validity of a block, and the bitmap is composed of a bit stream covering whole blocks in main area. +Write-hint Policy +----------------- + +F2FS sets the whint all the time with the below policy. + +===================== ======================== =================== +User F2FS Block +===================== ======================== =================== +N/A META WRITE_LIFE_NONE|REQ_META +N/A HOT_NODE WRITE_LIFE_NONE +N/A WARM_NODE WRITE_LIFE_MEDIUM +N/A COLD_NODE WRITE_LIFE_LONG +ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME +extension list " " + +-- buffered io +N/A COLD_DATA WRITE_LIFE_EXTREME +N/A HOT_DATA WRITE_LIFE_SHORT +N/A WARM_DATA WRITE_LIFE_NOT_SET + +-- direct io +WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME +WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT +WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET +WRITE_LIFE_NONE " WRITE_LIFE_NONE +WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM +WRITE_LIFE_LONG " WRITE_LIFE_LONG +===================== ======================== =================== + Fallocate(2) Policy ------------------- |