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authorStefan Roesch <shr@devkernel.io>2022-11-18 16:52:15 -0800
committerAndrew Morton <akpm@linux-foundation.org>2022-11-30 15:59:06 -0800
commiteba39236f18da7a50b6c51df5d902ee72c43e760 (patch)
treedf4c63e9614e7d21e500647aec020909ba2f1068 /Documentation
parentad3e6dabf6f7d9ffd68eb711191ef16cdbdd25f0 (diff)
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-class-bdi15
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi
index e9c584db316f..0d2abd88a18c 100644
--- a/Documentation/ABI/testing/sysfs-class-bdi
+++ b/Documentation/ABI/testing/sysfs-class-bdi
@@ -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>