ftrace_graph_probe_sched_switch  560 kernel/trace/fgraph.c 		ret = register_trace_sched_switch(ftrace_graph_probe_sched_switch, NULL);
ftrace_graph_probe_sched_switch  622 kernel/trace/fgraph.c 	unregister_trace_sched_switch(ftrace_graph_probe_sched_switch, NULL);