Re: [Xen-devel] Calculating real cpu usage of Xen domains correctly!

[Andrew Theurer <habanero@xxxxxxxxxx>]

Anthony Liguori wrote:

> Ian Pratt wrote:
>
> > Rather than trying to come up with metrics like this, I'd rather have
> > vm-top show the percentage of a physical CPU that each domain used,
> > independent of it's allocation.
> > i.e. total including the idle domain will be #CPUS x 100%.
> >
> >  
> Right, that's exactly what we want to do.  How does one get that 
> information?  We thought that xc_domain_get_cpu_usage() would provide 
> that information but it doesn't appear too.
(Caution: I have not even looked at this code and am ready to insert 
foot in mouth) Can you derive this based on a delta of time stamps, 
those timestamps correlating to times when the xen scheduler granted a 
domain's virtual cpu a physical cpu and when it was removed from a 
physical cpu?
-Andrew Theurer



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