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

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Mon, Nov 09, 2015 at 04:47:20PM +0100, Dario Faggioli wrote:
> 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.

And you need to apply an patch this patch for x86:

http://lists.xen.org/archives/html/xen-devel/2015-11/msg00633.html
since the lock_profile also adds tons of data in the 'struct spinlock'
making the 'struct domain' bigger than 4K (to 68K!).
> 
> 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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