[Xen-devel] Re: 0/4 Xen Scheduling Groups

["Mike D. Day" <ncmike@xxxxxxxxxx>]

On 11/05/07 22:11 +0100, Keir Fraser wrote:
> On 11/5/07 20:41, "Mike D. Day" <ncmike@xxxxxxxxxx> wrote:
>
> > After these first patches get accepted I plan on implementing a
> > feature where one domain can tell the scheduler it would like to run
> > *after* a different domain in the same group.
> >
> > Xen already does this for dom0
> Does it?
When an hvm domain does an emulated io, xen creates an event which is
delivered to the idle domain (xen), which in turn triggers a soft
interrupt on domain 0. In effect dom0 is immediately scheduled. Dom 0
then emulates the io while the hvm domain is sleeping. I assume the
same holds for other i/o events to domain zero, although I haven't
looked at that code. This is the kind of scheduling effect that would
be nice to have for a stub domain in relation to an hvm domian. But
the stub domain doesn't have any special status that schedules it to run
immediately.

--
Mike D. Day
IBM LTC
Cell: 919 412-3900
Sametime: ncmike@xxxxxxxxxx AIM: ncmikeday  Yahoo: ultra.runner
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