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[RFC,v1,09/14] mm: document new /sys/class/bdi/<bdi>/max_bytes knob

Message ID 20221011010044.851537-10-shr@devkernel.io (mailing list archive)
State New
Headers show
Series mm/block: add bdi sysfs knobs | expand

Commit Message

Stefan Roesch Oct. 11, 2022, 1 a.m. UTC 
This documents the new /sys/class/bdi/<bdi>/max_bytes knob.

Signed-off-by: Stefan Roesch <shr@devkernel.io>
---
 Documentation/ABI/testing/sysfs-class-bdi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
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Patch

diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi
index 68b5d4018c2f..580f723de049 100644
--- a/Documentation/ABI/testing/sysfs-class-bdi
+++ b/Documentation/ABI/testing/sysfs-class-bdi
@@ -56,6 +56,20 @@  Description:
 	be trusted to play fair.
 
 	(read-write)
+
+What:		/sys/class/bdi/<bdi>/max_bytes
+Date:		October 2022
+Contact:	Stefan Roesch <shr@devkernel.io>
+Description:
+	Allows limiting a particular device to use not more than the
+	given 'max_bytes' of the write-back cache.  This is useful in
+	situations where we want to avoid one device taking all or
+	most of the write-back cache.  For example in case of an NFS
+	mount that is prone to get stuck, a FUSE mount which cannot be
+	trusted to play fair, or a nbd device.
+
+	(read-write)
+
 What:		/sys/class/bdi/<bdi>/strict_limit
 Date:		October 2022
 Contact:	Stefan Roesch <shr@devkernel.io>