linux-kernel - Re: [tip:perf/core] perf tools: Allow multiple threads or processes in record, stat, top

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Date:	Sat, 3 Mar 2012 08:42:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Ahern <dsahern@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, acme@...hat.com, fweisbec@...il.com,
	peterz@...radead.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [tip:perf/core] perf tools: Allow multiple threads or processes
 in record, stat, top


* David Ahern <dsahern@...il.com> wrote:

> That first cup of coffee is so important.
> 
> On 3/2/12 3:56 AM, Ingo Molnar wrote:
> >phoenix:~>  perf record -a sleep 1
> >[ perf record: Woken up 1 times to write data ]
> >[ perf record: Captured and wrote 0.023 MB perf.data (~988 samples) ]
> >phoenix:~>  perf report --stdio
> >Warning:
> >The perf.data file has no samples!
> ># ========
> ># captured on: Fri Mar  2 12:01:41 2012
> ># hostname : phoenix
> ># os release : 3.3.0-rc5+
> ># perf version : 3.3.rc5.1698.g68a63a.dirty
> ># arch : x86_64
> ># nrcpus online : 16
> ># nrcpus avail : 16
> ># cpudesc : Quad-Core AMD Opteron(tm) Processor 8356
> ># cpuid : AuthenticAMD,16,2,3
> 
> Would you mind adding this patch:
>   https://lkml.org/lkml/2012/2/29/217
> and see if it fixes your problem?

That one appears to have done the trick - I committed it 
yesterday, shortly after I did the testing - unknowing that it 
would fix this bug as well :-)

Thanks,

	Ingo
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