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

[Ian Campbell <ian.campbell@citrix.com>]

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.

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

Ian.
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