linux-kernel - Re: [TEST PATCH] Test NMI kprobe modules

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Date:	Wed, 16 Apr 2008 10:54:40 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <andi@...stfloor.org>, akpm@...l.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [TEST PATCH] Test NMI kprobe modules

* Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Mathieu Desnoyers <compudj@...stal.dyndns.org> wrote:
> 
> > +long debug_eip, debug_cs, debug_eflags, debug_extra, debug_extra2, debug_extra3, debug_extra4;
> > +long debugo_eip, debugo_cs, debugo_eflags, debugo_extra, debugo_extra2, debugo_extra3, debugo_extra4;
> > +EXPORT_SYMBOL(debug_eip);
> > +EXPORT_SYMBOL(debug_cs);
> > +EXPORT_SYMBOL(debug_eflags);
> > +EXPORT_SYMBOL(debug_extra);
> > +EXPORT_SYMBOL(debug_extra2);
> > +EXPORT_SYMBOL(debug_extra3);
> > +EXPORT_SYMBOL(debug_extra4);
> > +EXPORT_SYMBOL(debugo_eip);
> > +EXPORT_SYMBOL(debugo_cs);
> > +EXPORT_SYMBOL(debugo_eflags);
> > +EXPORT_SYMBOL(debugo_extra);
> > +EXPORT_SYMBOL(debugo_extra2);
> > +EXPORT_SYMBOL(debugo_extra3);
> > +EXPORT_SYMBOL(debugo_extra4);
> 
> ok, while this is a test patch of yours, lets make one thing sure: all 
> things hook-alike instrumentation _MUST_ and will stay stay GPL 
> exported. It's all very internal, and there will be no automatic, 
> programmable interface stability guarantees for any of the markers that 
> kabi crap could come and shackle the kernel with ... (it will all be 
> stable to SystemTap of course - but SystemTap is a kernel-internal 
> entity in that regard)
> 
> 	Ingo
> 

Yes, I agree. This patch is just an ugly test-hack. :)

I already designed my LTTng tracer so it follows changes to the internal
kernel structures as easily as possible, but yes, it is kernel internal
too.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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