From: Stefan Roesch <shr@devkernel.io> mainline inclusion from mainline-v6.2-rc1 commit 9c832a8d571784c998d0f9f5df480c62f7f3064c category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAN96I Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- This documents the new /sys/class/bdi/<bdi>/min_bytes knob. [akpm@linux-foundation.org: fix htmldocs warnings] Link: https://lkml.kernel.org/r/20221119005215.3052436-15-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> Signed-off-by: Yifan Qiao <qiaoyifan4@huawei.com> --- Documentation/ABI/testing/sysfs-class-bdi | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi index 726c2e2c15cf..5b1341ffbd6d 100644 --- a/Documentation/ABI/testing/sysfs-class-bdi +++ b/Documentation/ABI/testing/sysfs-class-bdi @@ -50,6 +50,21 @@ max_ratio (read-write) (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> -- 2.39.2