This documents the new /sys/class/bdi/<bdi>/max_ratio_fine knob. Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx> --- Documentation/ABI/testing/sysfs-class-bdi | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi index bec996e29565..34d2e5489c74 100644 --- 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@xxxxxxxxxxxx> +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@xxxxxxxxxxxx> -- 2.30.2
