why could cause PerfTop get nothing output ?

[Luming Yu]

Hi acme,

I got nothing output as below, wondering if it was due to too few interrupts ?
Is it possbile to get perf top based on samples from other Perf events?

[root@localhost clocksource0]# rpm -qa | grep perf
perf-2.6.36-0.35.rc7.git0.fc15.x86_64
[root@localhost clocksource0]# uname -a
Linux localhost.localdomain 2.6.36-0.35.rc7.git0.fc15.x86_64 #1 SMP
Wed Oct 6 22:02:54 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost clocksource0]# perf top

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

             samples  pcnt  DSO
             _______ _____

Thanks,
Luming
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