Re: [Qemu-devel] RFC: running the user interface in a thread ...

[Gerd Hoffmann]

On Do, 2016-01-21 at 10:05 +0100, Paolo Bonzini wrote:
> 
> On 21/01/2016 09:44, Dave Airlie wrote:
> > I've hacked on this before, but only with SDL and it was pretty dirty,
> > and it gave a fairly decent
> > speed up.
> > 
> > My thoughts are to use dataplane like design to process the queue in a
> > separate thread,
> > and then have some sort of channel between the UI and virtio-gpu
> > thread to handle things like
> > screen resize etc.
> > 
> > http://cgit.freedesktop.org/~airlied/qemu/commit/?h=dave3d&id=fe22a0955255afef12b947c4a91efa57e7a7c429
> > is my previous horror patch.
> 
> Instead of having a full-blown thread, are there things (such as the
> TGSI->GLSL conversion) that could be simply offloaded to a userspace
> thread pool, either in QEMU or in virglrenderer?

I think virglrenderer would have to do that.  Unfortunaly opengl isn't
very good at multithreading, so I'm not sure a thread pool would work
well.  Compiling shaders could be a special case where threading
actually works because that isn't in the actual rendering workflow.  Not
fully sure though, Dave?

cheers,
  Gerd