Enable support for block device writeback throttling

modulename: blk-wbt.ko

configname: CONFIG_BLK_WBT

Linux Kernel Configuration
└─>Enable the block layer
└─>Enable support for block device writeback throttling
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Enabling this option enables the block layer to throttle buffered
background writeback from the VM, making it more smooth and having
less impact on foreground operations. The throttling is done
dynamically on an algorithm loosely based on CoDel, factoring in
the realtime performance of the disk.

source code:
depends
CONFIG_BLOCK