Re: Signal from kernel space to user space

[Davide Libenzi]

On Tue, 1 Dec 2009, Mark Hounschell wrote:

> If no "information" is required, which of these are the fastest, say from an interrupt handler?
> I have a PCI card that handles external interrupts from the outside world and does nothing but
> report those external interrupts to userland. We use send_sig or wake_up_process depending
> on whether userland is going to wait for it or not. If there is a better/faster way I would be
> very interested.

eventfd is. eventfd_signal() is also callable from non-sleeping contexts.


- Davide


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