Re: [RFC v2 4/7] change kernel accounting to include steal time

Rik van Riel
2010-08-30T19:45:38Z

On 08/30/2010 03:20 PM, Peter Zijlstra wrote:
> On Mon, 2010-08-30 at 15:17 -0400, Rik van Riel wrote:
>>
>> When time is accounted as steal time, it is NOT accounted as
>> to the current process user/system/..., which in turn should
>> help it in the scheduler.
>>
>> Am I overlooking something?
>
> Yeah, the scheduler doesn't care about the user/system time accounting
> at all... :-)

Uh oh. This would seem like something we'll want to fix
in an architecture independent way, so s390, etc. also
benefit from it.

I can see this being a real problem when the host and guest
OS have the same time slice - which is quite possible since
they may both be the same version of Linux.

Guest 1, alternating between processes A and B, may end up
with process A getting a lot of actual CPU time, and process
B being scheduled in when the VCPU itself is not running...

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