This adds support for the following proposed latency based IO control mechanism. https://lkml.org/lkml/2018/6/5/428
The kernel added support for a new cgroup memory controller knob memory.min in bf8d5d52ffe8 ("memcg: introduce memory.min") which was merged during v4.18 merge window. Add MemoryMin to support memory.min.
Tejun Heo