linux-kernel - Re: [patch] Re: [perf] Finding uninstalled modules Was Re: mailing list for trace users

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Date:	Wed, 23 Sep 2009 17:26:16 +0200
From:	Mike Galbraith <efault@....de>
To:	Avi Kivity <avi@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>, 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>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [patch] Re: [perf] Finding uninstalled modules Was Re: mailing
 list for trace users

On Wed, 2009-09-23 at 18:09 +0300, Avi Kivity wrote:
> On 09/23/2009 06:05 PM, Mike Galbraith wrote:
> >
> >> Well, you don't need to do anything to open a file from cwd: that's the
> >> default.  You need to actively prepend /lib/modules/blah to get it to
> >> load from the correct location.  What I don't understand is why it is
> >> only hitting me (esp. as it used to work).
> >>      
> > If your modules.dep, always was missing the /lib/modules/blah bit, it
> > never worked for you.  I wrote the thing with the rash assumption that
> > it always contained full path like mine does :)
> >
> >    
> 
> Ah, changed there, I missed that part earlier, sorry.  So it's probably 
> a change in modules.dep generation instead of tools/perf.
> 
> > So, I just need to check whether it's full path or not, prepend or take
> > the path as is, and hope there aren't several other ways to get screwed
> > up by modules.dep content.
> >    
> 
> Maybe we should fix that then (though I prefer relative paths myself).

I'll do the check for relative vs full thing, and a bail noisily if it
finds something else.  (later i guess, wife is giving me the evil eye;)

> > Too bad the kernel doesn't store the path in /sys/modules/bla/path.
> > That would be nicer than rummaging around in a mutable file.
> >    
> 
> But then you rely on a running kernel.  Be nice to be able to ship 
> perf.data.

Long term, all pertinent data should go into a shippable perf.data.

	-Mike

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