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Subject: Re: [RFC][PATCH 1/5] [PATCH 1/5] events: Add EVENT_FS the event
 filesystem
From: Steven Rostedt <rostedt@goodmis.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Ingo Molnar <mingo@elte.hu>, Greg KH <gregkh@suse.de>,
        linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Theodore Tso <tytso@mit.edu>, Arjan van de Ven <arjan@infradead.org>,
        Lin Ming <ming.m.lin@intel.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>
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Date: Wed, 17 Nov 2010 12:52:34 -0500
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On Wed, 2010-11-17 at 12:46 -0500, Mathieu Desnoyers wrote:
> * Steven Rostedt (rostedt@goodmis.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