Re: [PATCH 3/3] eventfd: add internal reference counting to fix notifier race conditions

Michael S. Tsirkin
2009-06-22T18:42:17Z

On Mon, Jun 22, 2009 at 11:03:22AM -0700, Davide Libenzi wrote:
> In your case of kernel-to-kernel scenario, why would you need eventfd at
> all, if userspace role in that model is simply to create it?

That's not 100% true. We have a mode where userspace is the producer
and/or consumer (migration mode) and we switch between that and
direct kernel-to-kernel communication.