17.11.3. /proc/interrupts
In the guest with QEMU graphic mode:
watch -n 1 cat /proc/interrupts
Then see how clicking the mouse and keyboard affect the interrupt counts.
This confirms that:
-
1: keyboard
-
12: mouse click and drags
The module also shows which handlers are registered for each IRQ, as we have observed at irq.ko
When in text mode, we can also observe interrupt line 4 with handler ttyS0 increase continuously as IO goes through the UART.