Re: [PATCH V3] perf & kvm: Enhance perf to collect KVM guest os statisticsfrom host side

[Avi Kivity]

On 04/15/2010 01:40 PM, Joerg Roedel wrote:
> > That means an NMI that happens outside guest code (for example, in the
> > mmu, or during the exit itself) would be counted as if in guest code.
> >      
> Hmm, true. The same is true for an NMI that happens between VMSAVE and
> STGI but that window is smaller. Anyway, I think we don't need the
> busy-wait loop. The NMI should be executed at a well defined point and
> we set the cpu_var back to NULL after that point.
>    

The point is not well defined.  Considering there are already at least 
two implementations svm, I don't want to rely on implementation details.

We could tune the position of the loop so that zero iterations are 
executed on the implementations we know about.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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