Re: [PATCH RFC 0/2] kvm: Improving undercommit,overcommit scenariosin PLE handler

[Raghavendra K T]

* Avi Kivity <avi@xxxxxxxxxx> [2012-09-27 14:03:59]:

> On 09/27/2012 01:23 PM, Raghavendra K T wrote:
> >>
[...]
> > 2) looking at the result (comparing A & C) , I do feel we have
> > significant in iterating over vcpus (when compared to even vmexit)
> > so We still would need undercommit fix sugested by PeterZ (improving by
> > 140%). ?
> 
> Looking only at the current runqueue?  My worry is that it misses a lot
> of cases.  Maybe try the current runqueue first and then others.
> 

Okay. Do you mean we can have something like

+       if (rq->nr_running == 1 && p_rq->nr_running == 1) {
+               yielded = -ESRCH;
+               goto out_irq;
+       }

in the Peter's patch ?

( I thought lot about && or || . Both seem to have their own cons ).
But that should be only when we have short term imbalance, as PeterZ
told.

I am experimenting all these for V2 patch. Will come back with analysis
and patch.

> Or were you referring to something else?
> 

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