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mm: document /sys/class/bdi/<bdi>/min_bytes knob

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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>
This commit is contained in:
Stefan Roesch 2022-11-18 16:52:09 -08:00 committed by Andrew Morton
parent 9c84819bd6
commit 9c832a8d57
1 changed files with 15 additions and 0 deletions
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Documentation/ABI/testing/sysfs-class-bdi
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@ -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>