perf_group_detach 2169 kernel/events/core.c 		perf_group_detach(event);
perf_group_detach 2213 kernel/events/core.c 		perf_group_detach(event);
perf_group_detach 11536 kernel/events/core.c 		perf_group_detach(child_event);
perf_group_detach 11683 kernel/events/core.c 	perf_group_detach(event);