linux-kernel - Re: perf timechart broken

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Date:	Fri, 14 Jan 2011 18:00:18 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	David Ahern <daahern@...co.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, linux-perf-users@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf timechart broken

On Tuesday 11 January 2011 19:56:22 David Ahern wrote:
> 
> On 01/11/11 01:55, Thomas Renninger wrote:
> > On Tuesday 11 January 2011 02:36:28 Frederic Weisbecker wrote:
> >> On Fri, Jan 07, 2011 at 11:04:37AM +0100, Thomas Renninger wrote:
> >>> Hi,
> >>>
> >>> Latest x86 tip has another perf timechart issue introduce
> >>> by latest commits.
> >>>
> >>> ./perf timechart
> >>> gives me:
> >>> "no trace data in the file"
> >>>
> >>> I reverted  the latest changes and things seem to break
> >>> between d854861c4292a4e675a5d3bfd862c5f7421c81e8
> >>> and
> >>> 69aad6f1ee69546dea8535ab8f3da9f445d57328
> >>> (linux-2.6-x86 tree ids)
> >>>
> >>> Be aware that ./perf timechart is currently broken
> >>> and segfaults on idle events (in 2.6.36 and 2.6.37).
> >>
> >> You mean .36 perf tools faults on .37 kernel? or the opposite?
> >> Is it because power_idle events weren't present on old tools?
> >> Do you have a pointer to those patches?
> > perf timechart
> > will segfault if perf.data has power_{start,end} events included
> > on 2.6.36 and 2.6.37 kernels.
> 
> Is this the same segfault you are seeing?
> 
> http://www.mail-archive.com/linux-perf-
users@...r.kernel.org/msg00057.html
Looks slightly different, the segfault should happen in:
process_sample_event
But looks very much related, possibly it has not been made/make with 
DEBUG=1
and -O6 was added and the backtrace is not 100% correct?

I still did not have time to send it out, will do so on Mo.

    Thomas
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