RE: [Xen-users] Linux-Windows data sharing in Xen

["ITZIAR BALENCIAGA" <ibalenciaga@xxxxxxxx>]

I'm always writing it. I increment that value until an event happens:

while((*pAcabar) == FALSE)
{
        (*pDatos)++;
}
So I think I can't use Xenstore but is it possible doing it with the functions I mentioned before (xc_domain_translate_gpfn_list and xc_map_foreign_batch) or is there any other way?

-----Mensaje original-----
De: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx]
Enviado el: lun 01/06/2009 15:00
Para: ITZIAR BALENCIAGA; xen-users@xxxxxxxxxxxxxxxxxxx
Asunto: RE: [Xen-users] Linux-Windows data sharing in Xen

>
> The counter is continuously changing and I refresh the window where I
show the
> value every 500 ms. Is it too often for xenstore?

So you are reading it every 500ms, but how often are you writing it?

There is lots of overhead for a single write of xenstore, so if the
value changes a lot then do it another way.

James

>
>
> -----Mensaje original-----
> De: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx]
> Enviado el: lun 01/06/2009 14:08
> Para: ITZIAR BALENCIAGA; xen-users@xxxxxxxxxxxxxxxxxxx
> Asunto: RE: [Xen-users] Linux-Windows data sharing in Xen
>
> >
> > Now I'll try to explain my situation a little bit more. I use Xen
> 3.3.1 and
> > have Ubuntu 8.10 as my dom0 and Windows XP as my domU. I have two
> processes
> > where one of them writes into a counter and the other one visualizes
> its
> > value. I've done it in windows with shared memory (using
> CreateFileMapping)
> > and now I'd like to move it to my new system. My intention is
putting
> the
> > process that writes into the counter in Linux and the other one in
> Windows. In
> > the post I've previously mentioned he says that he does something
> similar
> > using the functions xc_domain_translate_gpfn_list and
> xc_map_foreign_batch.
> > I've tried to understand what these functions do but I had no
success
> and
> > don't know how to use them. Does anybody know anything about these
> functions?
> > Has anybody done anything similar and can show me the code in order
to
> try to
> > understand it better? If not, where could I find an example doing
> something
> > similar?
> >
>
> How often are your counters being updated? If it's not too often then
> xenstore could be used for this.
>
> James
>
>
>

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