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

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Date:	Fri, 22 Oct 2010 00:52:45 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Luming Yu <luming.yu@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: why could cause PerfTop get nothing output ?

Em Sat, Oct 09, 2010 at 05:07:42AM -0400, Luming Yu escreveu:
> Hi acme,
> 
> I got nothing output as below, wondering if it was due to too few interrupts ?

Try using a higher frequency:

perf top -F 100000

> Is it possbile to get perf top based on samples from other Perf events?

Yes, any event, just specify it like:

perf top -e instructions

- Arnaldo

> [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
>              _______ _____
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