From bba681cbb231920a786cd7303462fb2632af6f36 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Mon, 26 Jan 2015 17:41:23 -0800 Subject: 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 Signed-off-by: Jaegeuk Kim --- Documentation/ABI/testing/sysfs-fs-f2fs | 6 ++++++ Documentation/filesystems/f2fs.txt | 4 ++++ 2 files changed, 10 insertions(+) (limited to 'Documentation') 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" Description: Controls the memory footprint used by f2fs. + +What: /sys/fs/f2fs//trim_sections +Date: February 2015 +Contact: "Jaegeuk Kim" +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/ 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, -- cgit v1.2.3