trace_irq_handler_entry - called immediately before the irq action handler
void trace_irq_handler_entry(int irq, struct irqaction * action);
The struct irqaction pointed to by action contains various information about the handler, including the device name, action->name, and the device id, action->dev_id. When used in conjunction with the irq_handler_exit tracepoint, we can figure out irq handler latencies.
Jason Baron <firstname.lastname@example.org>
William Cohen <email@example.com>
|January 2017||Kernel Hackers Manual 4.8.|