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

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This documents the new /sys/class/bdi/<bdi>/max_ratio_fine knob.

[akpm@linux-foundation.org: fix htmldocs warnings]
Link: https://lkml.kernel.org/r/20221119005215.3052436-18-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>
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Stefan Roesch 2022-11-18 16:52:12 -08:00 committed by Andrew Morton
parent bca52dcbad
commit 54790f30fe
1 changed files with 13 additions and 0 deletions
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Documentation/ABI/testing/sysfs-class-bdi
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@ -57,6 +57,19 @@ Description:
(read-write)
What: /sys/class/bdi/<bdi>/max_ratio_fine
Date: November 2022
Contact: Stefan Roesch <shr@devkernel.io>
Description:
Allows limiting a particular device to use not more than the
given value of the write-back cache. The value is given as part
of 1 million. This is useful in situations where we want to avoid
one device taking all or most of the write-back cache. For example
in case of an NFS mount that is prone to get stuck, or a FUSE mount
which cannot be trusted to play fair.
(read-write)
What: /sys/class/bdi/<bdi>/min_bytes
Date: October 2022
Contact: Stefan Roesch <shr@devkernel.io>