3.11. perf_event

When the perf_event subsystem is attached to a hierarchy, all cgroups in that hierarchy can be used to group processes and threads which can then be monitored with the perf tool, as opposed to monitoring each process or thread separately or per-CPU. Cgroups which use the perf_event subsystem do not contain any special tunable parameters other than the common parameters listed in Section 3.12, “Common Tunable Parameters”.
For additional information on how tasks in a cgroup can be monitored using the perf tool, refer to the Red Hat Enterprise Linux Developer Guide, available from http://access.redhat.com/site/documentation/Red_Hat_Enterprise_Linux/.