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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>

authored by

Stefan Roesch and committed by
Andrew Morton
eba39236 ad3e6dab

+15
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Documentation/ABI/testing/sysfs-class-bdi
··· 44 44 45 45 (read-write) 46 46 47 + What: /sys/class/bdi/<bdi>/min_ratio_fine 48 + Date: November 2022 49 + Contact: Stefan Roesch <shr@devkernel.io> 50 + Description: 51 + Under normal circumstances each device is given a part of the 52 + total write-back cache that relates to its current average 53 + writeout speed in relation to the other devices. 54 + 55 + The 'min_ratio_fine' parameter allows assigning a minimum reserve 56 + of the write-back cache to a particular device. The value is 57 + expressed as part of 1 million. For example, this is useful for 58 + providing a minimum QoS. 59 + 60 + (read-write) 61 + 47 62 What: /sys/class/bdi/<bdi>/max_ratio 48 63 Date: January 2008 49 64 Contact: Peter Zijlstra <a.p.zijlstra@chello.nl>