linux-kernel - Re: mailing list for trace users

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Date:	Wed, 23 Sep 2009 10:26:40 +0200
From:	Mike Galbraith <efault@....de>
To:	Avi Kivity <avi@...hat.com>
Cc:	rostedt@...dmis.org, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	postmaster@...r.kernel.org
Subject: Re: mailing list for trace users

On Tue, 2009-09-22 at 22:14 +0300, Avi Kivity wrote:
> On 09/22/2009 10:09 PM, Mike Galbraith wrote:
> > On Tue, 2009-09-22 at 17:03 +0300, Avi Kivity wrote:
> >    
> >> On 09/22/2009 04:53 PM, Mike Galbraith wrote:
> >>      
> >>> Parses fine here, and INSTALL_MOD_STRIP=1 made zero difference.  can you
> >>> send me that module and .config gzipped up?
> >>>
> >>>
> >>>        
> >> Sent privately.
> >>      
> > I can reproduce with your config, so do don't (thankfully) need to rip
> > binary apart looking for tools things.  Will take a look.
> >    
> 
> Thanks!  While trace/perf still have some rough edges, they've already 
> proven incredibly valuable for debugging and performance analysis.

Heh, fixed that... pass the baggies please ;-)

With your config, symbols were being loaded twice.  Parsing of vmlinux
and modules goes fine.  Unless there are no modules currently loaded, or
_the last module scanned isn't loaded_ that is.  dso__load_modules()
then returns 0, and we fall back to kallsyms.. making a mess.

Anyway, there's some other bustage with your config, so I'm going to
have to do more symbol table debugging/validation.

	-Mike

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