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

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/20221119005215.3052436-21-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 16:52:15 -08:00 committed by Andrew Morton
parent ad3e6dabf6
commit eba39236f1
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Documentation/ABI/testing/sysfs-class-bdi
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@ -44,6 +44,21 @@ Description:
(read-write)
What: /sys/class/bdi/<bdi>/min_ratio_fine
Date: November 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_ratio_fine' parameter allows assigning a minimum reserve
of the write-back cache to a particular device. The value is
expressed as part of 1 million. For example, this is useful for
providing a minimum QoS.
(read-write)
What: /sys/class/bdi/<bdi>/max_ratio
Date: January 2008
Contact: Peter Zijlstra <a.p.zijlstra@chello.nl>