The cgroup documentation does not specify how a process can be removed from a
particular group. This patch adds a note at the end of the simple example
about how this is done. Also, some cgroups (like cpusets) require user input
before a new group can be used. This is noted in the patch as well.
diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt
index 44b8b7a..6c975a1 100644
@@ -349,6 +349,10 @@ To mount a cgroup hierarchy with all available subsystems, type:
The "xxx" is not interpreted by the cgroup code, but will appear in
/proc/mounts so may be any useful identifying string that you like.
+Note: Some subsystems do not work without some user input first. For instance,
+if cpusets are enabled the user will have to populate the cpus and mems files
+for each new cgroup created before that group can be used.
To mount a cgroup hierarchy with just the cpuset and memory
# mount -t cgroup -o cpuset,memory hier1 /dev/cgroup
@@ -426,6 +430,9 @@ You can attach the current shell task by echoing 0:
# echo 0 > tasks
+Note: To remove a task from a cgroup you must write its PID to the root
2.3 Mounting hierarchies by name
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