[Spice-devel] Cross-device access in SPICE server

[Alon Levy]

On Mon, Mar 05, 2012 at 09:40:04AM -0700, Noel Van Hook wrote:
> On Sun, Mar 4, 2012 at 12:29 PM, Yonit Halperin <yhalperi at redhat.com> wrote:
> > On 03/02/2012 09:06 PM, Noel Van Hook wrote:
> >>
> >> I was wondering if anyone had any experience or insight into a way for
> >> a worker in the server to get access to data from the other workers?
> >> Specifically I am looking into some optimization that would require a
> >> worker to have access to the surfaces stored in other workers.
> >> Is there an easy way for the worker threads to access the other
> >> workers?  I'm referring to the worker->surfaces[] array in
> >> red_worker.c
> >>
> >> Thanks,
> >> Noel
> >>
> >
> > Hi,
> >
> > Currently the different workers share the pixmaps' cache (and also the glz
> > dictionary). I.e., if an image is in use in more than one device, it will be
> > sent to the client only once and will enter the shared cache.
> > The surfaces themselves are not shared, but we plan to change the driver to
> > use only one device for multiple monitors, and then maybe this will change.
> > Can you be more specific about what you are trying to achieve? This will
> > help to give you more details.
> 
> We are trying to me the X driver XRandR compliant in such a way that
> we don't break other drivers (such as the Windows driver).
> We can collect all the heads together and make them look like a single
> device, but copy operations that go from one device to the other give
> us problems. Currently we are trying to modify the server to be able
> to access a source surface which is located on another device.

Cool, I was going to change the pci device to support multiple heads but
if you can get this to work without pci device changes it would make my
work lower priority. Please keep us updated :)

> 
> Noel
> 
> 
> -- 
> Noel Van Hook - Intelligraphics, Inc
> 522 Cooper Ave N
> Red Lodge, MT 59068
> Noel.Van.Hook at Intelligraphics.com  (425) 770-5561
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