Enable support for cost model based cgroup IO controller

modulename: blk-iocost.ko

configname: CONFIG_BLK_CGROUP_IOCOST

Linux Kernel Configuration
└─>Enable the block layer
└─>Enable support for cost model based cgroup IO controller
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Enabling this option enables the .weight interface for cost
model based proportional IO control. The IO controller
distributes IO capacity between different groups based on
their share of the overall weight distribution.

source code:
selects
CONFIG_BLK_RQ_IO_DATA_LEN
CONFIG_BLK_RQ_ALLOC_TIME

depends
CONFIG_BLK_CGROUP
CONFIG_BLOCK