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3.3. Creating Control Groups
Use the
cgcreate
command to create transient cgroups in hierarchies you created yourself. The syntax for cgcreate
is:
cgcreate
-t
uid:gid-a
uid:gid-g
controllers:path
where:
-t
(optional) — specifies a user (by user ID, uid) and a group (by group ID, gid) to own thetasks
pseudo-file for this cgroup. This user can add tasks to the cgroup.Note
Note that the only way to remove a process from a cgroup is to move it to a different cgroup. To be able to move a process, the user has to have write access to the destination cgroup; write access to the source cgroup is not necessary.-a
(optional) — specifies a user (by user ID, uid) and a group (by group ID, gid) to own all pseudo-files other thantasks
for this cgroup. This user can modify the access to system resources for tasks in this cgroup.-g
— specifies the hierarchy in which the cgroup should be created, as a comma-separated list of the controllers associated with hierarchies. The list of controllers is followed by a colon and the path to the child group relative to the hierarchy. Do not include the hierarchy mount point in the path.
Because all cgroups in the same hierarchy have the same controllers, the child group has the same controllers as its parent.
As an alternative, you can create a child of the cgroup directly. To do so, use the
mkdir
command:
~]# mkdir /sys/fs/cgroup/controller/name/child_name
For example:
~]# mkdir /sys/fs/cgroup/net_prio/lab1/group1