mainline inclusion
from mainline-5.4-rc1
commit 8504dea783b044cab620acbaef87b86ee84646fe
category: feature
bugzilla: 38688
CVE: NA

---------------------------

Add a script which can be used to generate device-specific iocost
linear model coefficients.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>