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

[Michael S. Tsirkin]

On Mon, May 09, 2011 at 03:27:33PM +0930, Rusty Russell wrote:
> 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?

I thought that if we keep the API kind of generic
there might be more of a chance that future transports
will be able to implement it. For example, with an
old host we can't commit to a specific index.

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

Hmm, maybe. OK.

-- 
MST