Commit eba39236 authored by Stefan Roesch's avatar Stefan Roesch Committed by Andrew Morton
Browse files

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: default avatarStefan Roesch <shr@devkernel.io>
Cc: Chris Mason <clm@meta.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent ad3e6dab

Documentation/ABI/testing/sysfs-class-bdi

+15 −0
Original line number Diff line number Diff line
@@ -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>