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| author | Stefan Roesch <shr@devkernel.io> | 2022-11-18 16:52:09 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-11-30 15:59:05 -0800 |
| commit | 9c832a8d571784c998d0f9f5df480c62f7f3064c (patch) | |
| tree | 1eb2a9dec7b5875c7fed9693cd7910edc95c3299 /Documentation | |
| parent | 9c84819bd64ec15cb15d041c45ebe4725e9d4f3b (diff) | |
| download | linux-9c832a8d571784c998d0f9f5df480c62f7f3064c.tar.bz2 | |
mm: document /sys/class/bdi/<bdi>/min_bytes knob
This documents the new /sys/class/bdi/<bdi>/min_bytes knob.
[akpm@linux-foundation.org: fix htmldocs warnings]
Link: https://lkml.kernel.org/r/20221119005215.3052436-15-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Cc: Chris Mason <clm@meta.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-bdi | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi index 580f723de049..a9a2f588a2b7 100644 --- a/Documentation/ABI/testing/sysfs-class-bdi +++ b/Documentation/ABI/testing/sysfs-class-bdi @@ -57,6 +57,21 @@ Description: (read-write) +What: /sys/class/bdi/<bdi>/min_bytes +Date: October 2022 +Contact: Stefan Roesch <shr@devkernel.io> +Description: + Under normal circumstances each device is given a part of the + total write-back cache that relates to its current average + writeout speed in relation to the other devices. + + The 'min_bytes' parameter allows assigning a minimum + percentage of the write-back cache to a particular device + expressed in bytes. + For example, this is useful for providing a minimum QoS. + + (read-write) + What: /sys/class/bdi/<bdi>/max_bytes Date: October 2022 Contact: Stefan Roesch <shr@devkernel.io> |