mm: document /sys/class/bdi/<bdi>/max_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/20221119005215.3052436-18-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>

diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi
index a9a2f58..e9c584d 100644 (file)
--- a/Documentation/ABI/testing/sysfs-class-bdi
+++ b/Documentation/ABI/testing/sysfs-class-bdi
@@ -57,6 +57,19 @@ Description:
 
        (read-write)
 
+What:          /sys/class/bdi/<bdi>/max_ratio_fine
+Date:          November 2022
+Contact:       Stefan Roesch <shr@devkernel.io>
+Description:
+       Allows limiting a particular device to use not more than the
+       given value of the write-back cache.  The value is given as part
+       of 1 million. 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, or a FUSE mount
+       which cannot be trusted to play fair.
+
+       (read-write)
+
 What:          /sys/class/bdi/<bdi>/min_bytes
 Date:          October 2022
 Contact:       Stefan Roesch <shr@devkernel.io>