Re: [KVM PATCH v4 2/2] kvm: add support for irqfd via eventfd-notification interface

Davide Libenzi
2009-05-08T03:18:48Z

On Thu, 7 May 2009, Avi Kivity wrote:

> What's your take on adding irq context safe callbacks to irqfd?
>
> To give some background here, we would like to use eventfd as a generic
> connector between components, so the components do not know about each other.
> So far eventfd successfully abstracts among components in the same process, in
> different processes, and in the kernel.
>
> eventfd_signal() can be safely called from irq context, and will wake up a
> waiting task. But in some cases, if the consumer is in the kernel, it may be
> able to consume the event from irq context, saving a context switch.
>
> So, will you consider patches adding this capability to eventfd?

Since I received this one after your ACK on the capability of eventfd of
triggering callbacks, I assume we're clear on this point, aren't we?

- Davide