[Lguest] [PATCH 14/18] virtio: add api for delayed callbacks

[Rusty Russell]

On Wed, 4 May 2011 23:52:33 +0300, "Michael S. Tsirkin" <mst at redhat.com> wrote:
> Add an API that tells the other side that callbacks
> should be delayed until a lot of work has been done.
> Implement using the new used_event feature.

Since you're going to add a capacity query anyway, why not add the
threshold argument here?

Then the caller can choose how much space it needs.  Maybe net and block
will want different things...

Cheers,
Rusty.