Re: [Xen-devel] [PATCH 1/2] cpu steal time accounting

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 22 Feb 2006, at 23:58, Dan Hecht wrote:

> The interface does not provide a way for a vcpu to atomically read the
> entire set of time values { wallclock time, real time counter, 
> available
> time counter, stolen time counter }.  While it seems that such a
> mechanism might be "nice" to have in theory, it seems unnecessary in
> practice.  Indeed, real hardware rarely provides this functionality.
>
> One nice side effect of having this feature is that the explicit stolen
> time counter (or available time counter) can be dropped entirely from
> the interface, since its value can be inferred from the real time
> counter and available time counter (or stolen time counter).
I don't understand the last paragraph here. It's not true that, for 
example,
 available_time = real_time - stolen_time
right?

 -- Keir


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