Re: [PATCH 0/2][KVM] guest time accounting

Avi Kivity
2007-08-13T08:38:15Z

Laurent Vivier wrote:
>> - perhaps the new fields should be guarded by a #ifdef CONFIG_HYPERVISOR
>> (selected by CONFIG_KVM)? that way the (minor) additional overhead is
>> only incurred if it can possibly be used. I imagine that our canine
>> cousin will want to use this as well.
>>
>
> There is also a CONFIG_VIRTUALIZATION and a CONFIG_VIRT_CPU_ACCOUNTING (from
> s390 and powerpc) Which one to use ?
>

Are these options for using the kernel as a guest or host? I'd guess
the former.

> I'm wondering if we can have a more accurate accounting:
>
> - For the moment we add all system time since the previous entering to the VCPU
> to the guest time (and I guess there is some real system time in it ???)
>
> - Perhaps we can sum nanoseconds spent in the VCPU and add it to cpustat when
> these ns are greater than 1 ms ? (I'm trying to make something in this way)
>

I think that it's okay to use the same method as user/system time
accounting. But Ingo the the right man to ask.

--
error compiling committee.c: too many arguments to function