/proc/kpagecgroup - memory cgroups

/proc/kpagecgroup (since Linux 4.3)

This file contains a 64-bit inode number of the memory cgroup each page is charged to, indexed by page frame number (see the discussion of /proc/pid/pagemap).

The /proc/kpagecgroup file is present only if the CONFIG_MEMCG kernel configuration option is enabled.

proc(5)