how to use 'perf kvm'?

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Hello,

Can someone tell me how to use the subcommand 'kvm' of the perf tool?
I'm trying to use it this way:

perf kvm --guest --guestkallsyms kallsyms top

where kallsyms is copied from the kvm guest. But nothing useful is
displayed, only some headers:


-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
   PerfTop:       0 irqs/sec  kernel:-nan% us:-nan% guest kernel:-nan% guest us:-nan% exact: -nan% [1000Hz cycles],  (all, 2 CPUs)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

             samples  pcnt  DSO
             _______ _____

exiting.

Thanks in advance.

-- 
Han Pingtian
Quality Engineer
hpt @ #kernel-qe
Red Hat, Inc
Freedom ... courage ... Commitment ... ACCOUNTABILITY
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