functiongraph.bconf

 1ftrace {
 2	tracing_on = 0  # off by default
 3	tracer = function_graph
 4	event.kprobes {
 5		start_event {
 6			probes = "pci_proc_init"
 7			actions = "traceon"
 8		}
 9		end_event {
10			probes = "pci_proc_init%return"
11			actions = "traceoff"
12		}
13	}
14}
15