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1ftrace {2 tracing_on = 0 # off by default3 tracer = function_graph4 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 16