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| author | Jens Axboe <axboe@fb.com> | 2016-11-28 17:22:47 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-28 18:27:03 +0100 |
| commit | 80e091d10e8bf7b801d634ea8870b9e907314424 (patch) | |
| tree | 05d99a001b158de7e3f6f9eb119f28bb226b8bc2 /Documentation/block | |
| parent | nbd: fix setting of 'error' in NBD_DO_IT ioctl (diff) | |
| download | linux-80e091d10e8bf7b801d634ea8870b9e907314424.tar.xz linux-80e091d10e8bf7b801d634ea8870b9e907314424.zip | |
blk-wbt: allow reset of default latency through sysfs
Allow a write of '-1' to reset the default latency target for
a given device. This removes knowledge of the different default
settings for rotational vs non-rotational from user space.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'Documentation/block')
| -rw-r--r-- | Documentation/block/queue-sysfs.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt index 14235e72a702..51642159aedb 100644 --- a/Documentation/block/queue-sysfs.txt +++ b/Documentation/block/queue-sysfs.txt @@ -188,7 +188,9 @@ wb_lat_usec (RW) If the device is registered for writeback throttling, then this file shows the target minimum read latency. If this latency is exceeded in a given window of time (see wb_window_usec), then the writeback throttling will start -scaling back writes. +scaling back writes. Writing a value of '0' to this file disables the +feature. Writing a value of '-1' to this file resets the value to the +default setting. Jens Axboe <jens.axboe@oracle.com>, February 2009 |