linux-kernel - why could cause PerfTop get nothing output ?

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Message-ID: <AANLkTi=vJArRbLup=F2duoxx47LFGTT3++4QiFZHJbzQ@mail.gmail.com>
Date:	Sat, 9 Oct 2010 05:07:42 -0400
From:	Luming Yu <luming.yu@...il.com>
To:	acme@...hat.com
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: why could cause PerfTop get nothing output ?

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@...alhost clocksource0]# rpm -qa | grep perf
perf-2.6.36-0.35.rc7.git0.fc15.x86_64
[root@...alhost 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@...alhost 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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