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authorJaegeuk Kim <jaegeuk@kernel.org>2015-01-27 04:41:23 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2015-02-12 04:04:44 +0300
commitbba681cbb231920a786cd7303462fb2632af6f36 (patch)
tree9937a96f18dec591769f0fc677587148c24fac9e /Documentation
parent487261f39bcd8983f55c611e299f70f34659674b (diff)
downloadlinux-bba681cbb231920a786cd7303462fb2632af6f36.tar.xz
f2fs: introduce a batched trim
This patch introduces a batched trimming feature, which submits split discard commands. This is to avoid long latency due to huge trim commands. If fstrim was triggered ranging from 0 to the end of device, we should lock all the checkpoint-related mutexes, resulting in very long latency. Reviewed-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-fs-f2fs6
-rw-r--r--Documentation/filesystems/f2fs.txt4
2 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 6f9157f16725..2c4cc42006e8 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -74,3 +74,9 @@ Date: March 2014
Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
Description:
Controls the memory footprint used by f2fs.
+
+What: /sys/fs/f2fs/<disk>/trim_sections
+Date: February 2015
+Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
+Description:
+ Controls the trimming rate in batch mode.
diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index 6758aa358475..dac11d7fef27 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -199,6 +199,10 @@ Files in /sys/fs/f2fs/<devname>
checkpoint is triggered, and issued during the
checkpoint. By default, it is disabled with 0.
+ trim_sections This parameter controls the number of sections
+ to be trimmed out in batch mode when FITRIM
+ conducts. 32 sections is set by default.
+
ipu_policy This parameter controls the policy of in-place
updates in f2fs. There are five policies:
0x01: F2FS_IPU_FORCE, 0x02: F2FS_IPU_SSR,