From: Stefan Roesch <shr@devkernel.io> mainline inclusion from mainline-v6.2-rc1 commit 54790f30fea74247e2f38b4a632ee3dc2fe42d86 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>/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> Signed-off-by: Yifan Qiao <qiaoyifan4@huawei.com> --- 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 5b1341ffbd6d..6e23417e0dd9 100644 --- a/Documentation/ABI/testing/sysfs-class-bdi +++ b/Documentation/ABI/testing/sysfs-class-bdi @@ -50,6 +50,19 @@ max_ratio (read-write) (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> -- 2.39.2