https://www.kernel.org/doc/Documentation/cgroups/memory.txt

Memory Resource Controller NOTE: The Memory Resource Controller has generically been referred to as the memory controller in this document. Do not confuse memory controller used here with the memory controller that is used in hardware. (For editors) In this document: When we mention a cgroup (cgroupfs's directory) with memory controller, we call it "memory cgroup". When you see git-log and source