Re: [Xen-devel] [BUG] Linux process vruntime accounting in Xen

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 05/16/2016 05:38 PM, Tony S wrote:
> The issue behind it is that the process execution calculation(e.g.,
> delta_exec) in virtualized environment should not be calculated as it
> did in physical enviroment.
>
> Here are two solutions to fix it:
>
> 1) Based on the vcpu->runstate.time(running/runnable/block/offline)
> changes, to determine how much time the process on this VCPU is
> running, instead of just "delta_exec = now - exec_start";
>
> 2) Build another clock inside the guest OS which records the exect
> time that the VCPU runs. All vruntime calculation is based on this
> clock, instead of hyperivosr clock/time(real clock).

Looks like CONFIG_PARAVIRT_TIME_ACCOUNTING is used for adjusting process
times. KVM uses it but Xen doesn't.

-boris


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