echo function > /sys/kernel/debug/tracing/current_tracer echo "1">/sys/kernel/debug/tracing/events/irq/irq_handler_entry/enable echo "1">/sys/kernel/debug/tracing/events/irq/irq_handler_exit/enable echo "1" >/sys/kernel/debug/tracing/tracing_on cat /sys/kernel/debug/tracing/trace echo "...