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authorJaegeuk Kim <jaegeuk@kernel.org>2014-09-11 03:53:02 +0400
committerJaegeuk Kim <jaegeuk@kernel.org>2014-09-16 15:10:44 +0400
commitc1ce1b02bb25640567dc484dc94d3a195d21e705 (patch)
tree66d98ac24b6959a78618b1706f156f8f76614ad8 /Documentation/ABI
parenta7ffdbe22cecaed59b5d76a5f003d68907d64240 (diff)
downloadlinux-c1ce1b02bb25640567dc484dc94d3a195d21e705.tar.xz
f2fs: give an option to enable in-place-updates during fsync to users
If user wrote F2FS_IPU_FSYNC:4 in /sys/fs/f2fs/ipu_policy, f2fs_sync_file only starts to try in-place-updates. And, if the number of dirty pages is over /sys/fs/f2fs/min_fsync_blocks, it keeps out-of-order manner. Otherwise, it triggers in-place-updates. This may be used by storage showing very high random write performance. For example, it can be used when, Seq. writes (Data) + wait + Seq. writes (Node) is pretty much slower than, Rand. writes (Data) Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/sysfs-fs-f2fs7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 62dd72522d6e..6f9157f16725 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -44,6 +44,13 @@ Description:
Controls the FS utilization condition for the in-place-update
policies.
+What: /sys/fs/f2fs/<disk>/min_fsync_blocks
+Date: September 2014
+Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
+Description:
+ Controls the dirty page count condition for the in-place-update
+ policies.
+
What: /sys/fs/f2fs/<disk>/max_small_discards
Date: November 2013
Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>