Re: [Qemu-devel] Linux kernel polling for QEMU

[Paolo Bonzini]

On 28/11/2016 16:29, Stefan Hajnoczi wrote:
> Thanks for sharing the link.  I'll let you know before embarking on an
> effort to make epoll support busy_loop.
> 
> At the moment I'm still evaluating whether the good results we've gotten
> from polling in QEMU userspace are preserved when polling is shifted to
> the kernel.
> 
> FWIW I've prototyped ioctl(EVENTFD_SET_POLL_INFO) but haven't had a
> chance to test it yet:
> https://github.com/stefanha/linux/commit/133e8f1da8eb5364cd5c5f7162decbc79175cd13

This would add a system call every time the main loop processes a vring,
wouldn't it?

Paolo