Man page 9 : trace_irq_handler_entry

trace_irq_handler_entry - called immediately before the irq action handler

void trace_irq_handler_entry(int  irq , struct irqaction *  action );

irq
    irq number

action
    pointer to struct irqaction

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 <>
    Author.

William Cohen <>
    Author.