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

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Message-ID: <1290016354.30543.71.camel@gandalf.stny.rr.com>
Date:	Wed, 17 Nov 2010 12:52:34 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	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>,
	Theodore Tso <tytso@....edu>,
	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>
Subject: Re: [RFC][PATCH 1/5] [PATCH 1/5] events: Add EVENT_FS the event
 filesystem

On Wed, 2010-11-17 at 12:46 -0500, Mathieu Desnoyers wrote:
> * Steven Rostedt (rostedt@...dmis.org) wrote:
> [...]
> > Are these events now going to be labeled as stable?  Is every tracepoint
> > we have, much have the same data?  Linus specifically said at Kernel
> > Summit that he wants absolutely NO modules to have a stable tracepoint.
> 
> I'd like to bring up the point of KVM tracepoints here. KVM can be configured as
> a module, and may clearly contain tracepoints that we'd like to be stable.
> 
> My thought is that what we really want to enforce is "no stable tracepoints in
> drivers" rather than in "modules", but I might be wrong.
> 
> Thoughts ?

I still say no to stable tracepoints in modules. Once you open that
door, everyone will have it.

But, that doesn't mean that a raw traepoint can't be stable. If the
maintainer of that tracepoint states it is stable, then by all means,
let tools use it.

-- Steve


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