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SubjectRe: [PATCH 0/11] VMI / Paravirt bugfixes for 2.6.21
Arjan van de Ven wrote:
> On Tue, 2007-02-06 at 16:11 +1100, Rusty Russell wrote:
>
>> On Mon, 2007-02-05 at 20:54 -0800, Zachary Amsden wrote:
>>
>>> Rusty Russell wrote:
>>>
>>>> Indeed, I'm expecting to push lguest this week, and this code will
>>>> effect me, so I'd like to see this in a -mm soon...
>>>>
>>> Yes, I took a look at the lguest changes today and I think these won't
>>> generate conflicts, just make stuff easier for you ;) Course you've now
>>> got a couple new paravirt-ops to support, but the native ones are fine
>>> for temporary use.
>>>
>> Implementing stolen time is something I'd like to do, since it'd be a
>> nice self-contained example the expectations.
>>
>
>
> hmm stolen time could even be useful without virtualization; to a large
> degree, if cpufreq reduces the speed of your cpu you have "stolen
> cycles" that way... I wonder if this concept can be used for that as
> well...
>

Yes, stolen time happens in most moderns systems as a result of power
management (and you can probably count SMM cycles as stolen if only
there was a way to count them). It would be useful to report on a
laptop, for instance, how many cycles have been stolen by running off
battery or on a server because of heat issues. Having an interface for
Linux to report this seems useful. It is a covert channel, however, in
a virtualized environment, so there should be some provision in the
hypervisor to turn it off.

Zach
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