linux-kernel - Re: [RFC][PATCH 1/5] [PATCH 1/5] events: Add EVENT

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Message-ID: <20101118130502.GC3741@Krystal>
Date:	Thu, 18 Nov 2010 08:05:02 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Ted Ts'o <tytso@....edu>, Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [RFC][PATCH 1/5] [PATCH 1/5] events: Add EVENT_FS the event
	filesystem

* Ted Ts'o (tytso@....edu) wrote:
> On Wed, Nov 17, 2010 at 12:52:34PM -0500, Steven Rostedt wrote:
> > 
> > I still say no to stable tracepoints in modules. Once you open that
> > door, everyone will have it.
> 
> What about having KVM define the stable tracepoints in the built-in
> part of the kernel, if CONFIG_KVM is Y or M, and then export the
> tracepoints, such that the tracepoints can be called from a module?
> 
> That way the tracepoints aren't being *defined* in a module, they are
> just being *called* from the module.  Does that seem like a reasonable
> compromise?

As Avi replied separately, he does not seem to think stable ABI is needed for
KVM, given that his tools can deal with tracepoint addition/removal pretty well.
However, let's keep this idea in mind if we ever face this issue with other
"core" modules.

Thanks Ted,

Mathieu

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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