The patch titled
Subject: mm: document /sys/class/bdi/<bdi>/min_ratio_fine knob
has been added to the -mm mm-unstable branch. Its filename is
mm-document-sys-class-bdi-bdi-min_ratio_fine-knob.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-document-sys-class-bdi-bdi-min_ratio_fine-knob.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Stefan Roesch <shr@xxxxxxxxxxxx>
Subject: mm: document /sys/class/bdi/<bdi>/min_ratio_fine knob
Date: Fri, 18 Nov 2022 16:52:15 -0800
This documents the new /sys/class/bdi/<bdi>/max_ratio_fine knob.
Link: https://lkml.kernel.org/r/20221119005215.3052436-21-shr@xxxxxxxxxxxx
Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
Cc: Chris Mason <clm@xxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-class-bdi | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/Documentation/ABI/testing/sysfs-class-bdi~mm-document-sys-class-bdi-bdi-min_ratio_fine-knob
+++ a/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@xxxxxxxxxxxx>
+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@xxxxxxxxx>
_
Patches currently in -mm which might be from shr@xxxxxxxxxxxx are
mm-add-bdi_set_strict_limit-function.patch
mm-add-knob-sys-class-bdi-bdi-strict_limit.patch
mm-document-sys-class-bdi-bdi-strict_limit-knob.patch
mm-use-part-per-1000000-for-bdi-ratios.patch
mm-add-bdi_get_max_bytes-function.patch
mm-split-off-__bdi_set_max_ratio-function.patch
mm-add-bdi_set_max_bytes-function.patch
mm-add-knob-sys-class-bdi-bdi-max_bytes.patch
mm-document-sys-class-bdi-bdi-max_bytes-knob.patch
mm-add-bdi_get_min_bytes-function.patch
mm-split-off-__bdi_set_min_ratio-function.patch
mm-add-bdi_set_min_bytes-function.patch
mm-add-sys-class-bdi-bdi-min_bytes-knob.patch
mm-document-sys-class-bdi-bdi-min_bytes-knob.patch
mm-add-bdi_set_max_ratio_no_scale-function.patch
mm-add-sys-class-bdi-bdi-max_ratio_fine-knob.patch
mm-document-sys-class-bdi-bdi-max_ratio_fine-knob.patch
mm-add-bdi_set_min_ratio_no_scale-function.patch
mm-add-sys-class-bdi-bdi-min_ratio_fine-knob.patch
mm-document-sys-class-bdi-bdi-min_ratio_fine-knob.patch
