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| author | Stefan Roesch <shr@devkernel.io> | 2022-11-19 03:52:15 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-12-01 02:59:06 +0300 |
| commit | eba39236f18da7a50b6c51df5d902ee72c43e760 (patch) | |
| tree | df4c63e9614e7d21e500647aec020909ba2f1068 /Documentation/ABI/testing/sysfs-class-bdi | |
| parent | ad3e6dabf6f7d9ffd68eb711191ef16cdbdd25f0 (diff) | |
| download | linux-eba39236f18da7a50b6c51df5d902ee72c43e760.tar.xz | |
mm: document /sys/class/bdi/<bdi>/min_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/20221119005215.3052436-21-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>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-bdi')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-bdi | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi index e9c584db316f..0d2abd88a18c 100644 --- a/Documentation/ABI/testing/sysfs-class-bdi +++ b/Documentation/ABI/testing/sysfs-class-bdi @@ -44,6 +44,21 @@ Description: (read-write) +What: /sys/class/bdi/<bdi>/min_ratio_fine +Date: November 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_ratio_fine' parameter allows assigning a minimum reserve + of the write-back cache to a particular device. The value is + expressed as part of 1 million. For example, this is useful for + providing a minimum QoS. + + (read-write) + What: /sys/class/bdi/<bdi>/max_ratio Date: January 2008 Contact: Peter Zijlstra <a.p.zijlstra@chello.nl> |