tree ea36cd79d9bf4ba855d231826d5bf17a58fd0242
parent 08332893e37af6ae779367e78e444f8f9571511d
author Shaohua Li <shli@fb.com> 1495051644 -0700
committer Jens Axboe <axboe@fb.com> 1495486032 -0600

blk-throttle: add hierarchy support for latency target and idle time

For idle time, children's setting should not be bigger than parent's.
For latency target, children's setting should not be smaller than
parent's. The leaf nodes will adjust their settings according to the
hierarchy and compare their IO with the settings and do
upgrade/downgrade. parents nodes don't need to track their IO
latency/idle time.

Signed-off-by: Shaohua Li <shli@fb.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>