Re: [Xen-devel] [PATCH] perfc: count number of explicit vcpu yields

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Mon, 2015-11-09 at 15:23 +0000, Ian Campbell wrote:
> On Mon, 2015-11-09 at 16:14 +0100, Dario Faggioli wrote:
> >  
> > > As far as xl accessibility --- doesn't xenperf already read them
> > > out?
> > > 
> > Mmm... ISTR having tried without much luck, and having heard that
> > it
> > wasn't functional any longer, but maybe I'm confusing it with
> > something
> > else. I'll try again.
> 
> I happened to have an xterm with this in its scroll buffer from
> earlier:
> 
> root@marilith-n0:~# xenperf 
> invalid hypercalls                  T=         0           0         
>  0          0          0
> trap: wfi                           T=     85068       56068     
>  11762       8461       8777
> trap: wfe                           T=      2811         614       
>  716        964        517
> trap: cp15 32-bit access            T=         4           1         
>  1          1          1
> trap: cp15 64-bit access            T=         0           0         
>  0          0          0
> trap: cp14 32-bit access            T=         0           0         
>  0          0          0
> trap: cp14 64-bit access            T=         0           0         
>  0          0          0
> trap: cp14 dbg access               T=         0           0         
>  0          0          0
> trap: cp access                     T=         0           0         
>  0          0          0
> trap: 32-bit smc                    T=         0           0         
>  0          0          0
> trap: 32-bit hvc                    T=      1291         510       
>  568        161         52
> trap: guest instr abort             T=         0           0         
>  0          0          0
> trap: guest data abort              T=     16446        6885      
>  4358       3431       1772
> trap: condition failed              T=         0           0         
>  0          0          0
> [...]
> 
> So I think it works.
> 
Ok, thanks for the confirmation, and sorry for the noise then.

> You need to build the hypervisor binary with perfc=y (and optionally
> perfc_arrays=y) or it doesn't do anything.
> 
Yeah, that I knew.

Thanks again and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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