Re: [RFC][PATCH v2 4/7] taskstats: Add per task steal time accounting

[Jeremy Fitzhardinge]

On 11/16/2010 08:05 AM, Martin Schwidefsky wrote:
>>> Yes and no. The tracepoint idea looks interesting in itself. But that does
>>> not completely replace the per-task steal time. The hypervisor can take
>>> away the cpu anytime, it is still interesting to know which task was hit
>>> hardest by that. You could view the cpu time lost by a hypercall as
>>> "synchronous" steal time for the task, the remaining delta to the total
>>> per-task steal time as "asynchronous" steal time. 
>> Right, so there is no way the guest knows about the vcpu getting
>> scheduled, it can only derive the fact from hardware clocks after the
>> fact?
> Correct.

Yes, same for Xen.

    J

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