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blk-wbt: doc: Update the doc of the wbt_lat_usec interface 

The symbol wb_window_usec cannot be found. Update the doc to reflect the
latest implementation, in other words, the debugfs interface
'curr_win_nsec'.

Signed-off-by: Tang Yizhou <yizhou.tang@shopee.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20250727173959.160835-4-yizhou.tang@shopee.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1347/head
Tang Yizhou 2025-07-28 01:39:59 +08:00 committed by Jens Axboe
parent bccdfcd56d
commit 0452f08395
1 changed files with 1 additions and 1 deletions
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Documentation/ABI/stable/sysfs-block
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@ -731,7 +731,7 @@ Contact: linux-block@vger.kernel.org
Description: Description:
[RW] If the device is registered for writeback throttling, then [RW] If the device is registered for writeback throttling, then
this file shows the target minimum read latency. If this latency this file shows the target minimum read latency. If this latency
is exceeded in a given window of time (see wb_window_usec), then is exceeded in a given window of time (see curr_win_nsec), then
the writeback throttling will start scaling back writes. Writing the writeback throttling will start scaling back writes. Writing
a value of '0' to this file disables the feature. Writing a a value of '0' to this file disables the feature. Writing a
value of '-1' to this file resets the value to the default value of '-1' to this file resets the value to the default