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[RFC,v4,14/20] mm: document /sys/class/bdi/<bdi>/min_bytes knob

Message ID 20221119005215.3052436-15-shr@devkernel.io (mailing list archive)
State New
Headers show
Series mm/block: add bdi sysfs knobs | expand

Commit Message

Stefan Roesch Nov. 19, 2022, 12:52 a.m. UTC 
This documents the new /sys/class/bdi/<bdi>/min_bytes knob.

Signed-off-by: Stefan Roesch <shr@devkernel.io>
---
 Documentation/ABI/testing/sysfs-class-bdi | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
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Patch

diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi
index 580f723de049..bec996e29565 100644
--- a/Documentation/ABI/testing/sysfs-class-bdi
+++ b/Documentation/ABI/testing/sysfs-class-bdi
@@ -57,6 +57,21 @@  Description:
 
 	(read-write)
 
+What:		/sys/class/bdi/<bdi>/min_bytes
+Date:		October 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_bytes' parameter allows assigning a minimum
+	percentage of the write-back cache to a particular device
+    expressed in bytes.
+	For example, this is useful for providing a minimum QoS.
+
+	(read-write)
+
 What:		/sys/class/bdi/<bdi>/max_bytes
 Date:		October 2022
 Contact:	Stefan Roesch <shr@devkernel.io>