Prabhu nath wrote:

But if the device has to generate an interrupt on the reception of the data
then it is best for the driver code to be in the kernel space waiting for
the data, rather than in the user space because there is no efficient
mechanism till now for the control to be transferred to the waiting user
space code on the reception of the interrupt.

What are the curently available mechanisms for an interrupt to
propagate into user space?

Is there one that affects the scheduler?

- Gergely