diff options
| author | Konstantin Vyshetsky <vkon@google.com> | 2021-12-13 17:12:43 -0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2022-02-02 16:34:55 -0800 |
| commit | b2e4a2b300e5e2042e8d92ec16fc124222b7ecc9 (patch) | |
| tree | 81408d12355db80d3fd24d20b83af094acb1b223 /Documentation | |
| parent | d2d8e896485a52554cea486816c171dc7240792e (diff) | |
f2fs: expose discard related parameters in sysfs
This patch exposes max_discard_request, min_discard_issue_time,
mid_discard_issue_time, and max_discard_issue_time in sysfs. This will
allow the user to fine tune discard operations.
Signed-off-by: Konstantin Vyshetsky <vkon@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-f2fs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 2416b03ff283..87d3884c90ea 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -98,6 +98,33 @@ Description: Controls the issue rate of discard commands that consist of small checkpoint is triggered, and issued during the checkpoint. By default, it is disabled with 0. +What: /sys/fs/f2fs/<disk>/max_discard_request +Date: December 2021 +Contact: "Konstantin Vyshetsky" <vkon@google.com> +Description: Controls the number of discards a thread will issue at a time. + Higher number will allow the discard thread to finish its work + faster, at the cost of higher latency for incomming I/O. + +What: /sys/fs/f2fs/<disk>/min_discard_issue_time +Date: December 2021 +Contact: "Konstantin Vyshetsky" <vkon@google.com> +Description: Controls the interval the discard thread will wait between + issuing discard requests when there are discards to be issued and + no I/O aware interruptions occur. + +What: /sys/fs/f2fs/<disk>/mid_discard_issue_time +Date: December 2021 +Contact: "Konstantin Vyshetsky" <vkon@google.com> +Description: Controls the interval the discard thread will wait between + issuing discard requests when there are discards to be issued and + an I/O aware interruption occurs. + +What: /sys/fs/f2fs/<disk>/max_discard_issue_time +Date: December 2021 +Contact: "Konstantin Vyshetsky" <vkon@google.com> +Description: Controls the interval the discard thread will wait when there are + no discard operations to be issued. + What: /sys/fs/f2fs/<disk>/discard_granularity Date: July 2017 Contact: "Chao Yu" <yuchao0@huawei.com> |