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blk-wbt: allow reset of default latency through sysfs

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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 <[email protected]>
This commit is contained in:
Jens Axboe 2016-11-28 09:22:47 -07:00
commit 80e091d10e
4 changed files with 37 additions and 12 deletions
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4
Documentation/block/queue-sysfs.txt
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@ -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 <[email protected]>, February 2009