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

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

Link: https://lkml.kernel.org/r/20221119005215.3052436-10-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 16:52:04 -08:00 • committed by Andrew Morton
parent c56e049a5e
commit c354d9268d
1 changed files with 14 additions and 0 deletions
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Documentation/ABI/testing/sysfs-class-bdi
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@ -56,6 +56,20 @@ Description:
be trusted to play fair.
(read-write)
What: /sys/class/bdi/<bdi>/max_bytes
Date: October 2022
Contact: Stefan Roesch <shr@devkernel.io>
Description:
Allows limiting a particular device to use not more than the
given 'max_bytes' of the write-back cache. 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, a FUSE mount which cannot be
trusted to play fair, or a nbd device.
(read-write)
What: /sys/class/bdi/<bdi>/strict_limit
Date: October 2022
Contact: Stefan Roesch <shr@devkernel.io>