Re: [Xen-devel] Cpu pools discussion

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

Keir Fraser wrote:
> On 30/07/2009 13:51, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxx> wrote:
> 
>>> I think especially if cpupools are added into the mix then this becomes more
>>> attractive than the current approach. The other alternative is to modify the
>>> two existing problematic callers to work okay from softirq context (or not
>>> need continue_hypercall_on_cpu() at all, which might be possible at least in
>>> the case of CPU hotplug). I would be undecided between these two just now --
>>> it depends on how easily those two callers can be fixed up.
>> I'll try to set up a patch to add a hypervisor domain. Regarding all the
>> problems I got with switching cpus between pools (avoid running on the cpu to
>> be switched etc.) this solution could make life much easier.
> 
> I'm inclined actually to think a hypervisor domain is not necessary, and we
> can get by with softirqs. I actually think cpu offline can be reimplemented
> without softirqs or continue_hypercall_on_cpu(), and I would imagine cpupool
> changes then could use a similar technique. I will take a look at that, and
> you can take your cues from it if I find an elegant solution along those
> lines.

Thanks, that's great!


Juergen

-- 
Juergen Gross                 Principal Developer Operating Systems
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