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

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

Link: https://lkml.kernel.org/r/20221119005215.3052436-4-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 16:51:58 -08:00 committed by Andrew Morton
parent 27bbe9d48d
commit 16b837eb84
1 changed files with 11 additions and 0 deletions
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Documentation/ABI/testing/sysfs-class-bdi
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@ -55,6 +55,17 @@ Description:
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>/strict_limit
Date: October 2022
Contact: Stefan Roesch <shr@devkernel.io>
Description:
Forces per-BDI checks for the share of given device in the write-back
cache even before the global background dirty limit is reached. This
is useful in situations where the global limit is much higher than
affordable for given relatively slow (or untrusted) device. Turning
strictlimit on has no visible effect if max_ratio is equal to 100%.
(read-write)
What: /sys/class/bdi/<bdi>/stable_pages_required
Date: January 2008