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| author | Stefan Roesch <shr@devkernel.io> | 2022-11-18 16:52:04 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-11-30 15:59:04 -0800 |
| commit | c354d9268d7825eb8643f658c5091079d4f11a4a (patch) | |
| tree | 02e3395547a1d229c4ba314e2d747d203bab994a | |
| parent | c56e049a5e401a177c7c9b39a3bcc973ff5cec0b (diff) | |
mm: document /sys/class/bdi/<bdi>/max_bytes knob
This documents the new /sys/class/bdi/<bdi>/max_bytes knob.
Link: https://lkml.kernel.org/r/20221119005215.3052436-10-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>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-bdi | 14 |
1 files changed, 14 insertions, 0 deletions
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> |