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

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Mon, May 16, 2016 at 11:33 PM, Boris Ostrovsky
<boris.ostrovsky@xxxxxxxxxx> wrote:
> 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.

Is someone on the Linux side going to put this on their to-do list then? :-)

 -George

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