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

[Paolo Bonzini]

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?

If you can do this in QEMU, as an alternative to writing code with
callbacks we have coroutines based on a setjmp-longjmp and also a simple
thread pool (thread-pool.c).  If you want to allocate your own
thread-pool, you can create an additional AioContext (aio_context_new)
and add the AioContext to the glib main loop using aio_get_g_source.

Paolo