sys_kernel_cgroup(5)

File Formats Manual

NAME

/sys/kernel/cgroup/ - Linux control groups

/sys/kernel/cgroup/

/sys/kernel/cgroup/delegate (since Linux 4.15): This file exports a list of the cgroups v2 files (one per line) that are delegatable (i.e., whose ownership should be changed to the user ID of the delegatee). In the future, the set of delegatable files may change or grow, and this file provides a way for the kernel to inform user-space applications of which files must be delegated. As at Linux 4.15, one sees the following when inspecting this file:

$ cat /sys/kernel/cgroup/delegate
cgroup.procs
cgroup.subtree_control
cgroup.threads

/sys/kernel/cgroup/features (since Linux 4.15): Over time, the set of cgroups v2 features that are provided by the kernel may change or grow, or some features may not be enabled by default. This file provides a way for user-space applications to discover what features the running kernel supports and has enabled. Features are listed one per line:

$ cat /sys/kernel/cgroup/features
nsdelegate
memory_localevents

The entries that can appear in this file are:

memory_localevents (since Linux 5.2): The kernel supports the memory_localevents mount option.
nsdelegate (since Linux 4.15): The kernel supports the nsdelegate mount option.
memory_recursiveprot (since Linux 5.7): The kernel supports the memory_recursiveprot mount option.

Linux.

Linux 2.6.0.