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Date: Wed, 17 Nov 2010 13:12:22 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Steven Rostedt <rostedt@goodmis.org>, Avi Kivity <avi@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, Greg KH <gregkh@suse.de>,
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        Lin Ming <ming.m.lin@intel.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [RFC][PATCH 1/5] [PATCH 1/5] events: Add EVENT_FS the event
	filesystem
Message-ID: <20101117181222.GB1093@Krystal>
References: <20101117005357.024472450@goodmis.org> <20101117005939.600541101@goodmis.org> <20101117033242.GB31335@suse.de> <20101117103914.GA21976@elte.hu> <1289996753.30543.35.camel@gandalf.stny.rr.com> <20101117174652.GC13717@Krystal> <1290016354.30543.71.camel@gandalf.stny.rr.com>
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* Steven Rostedt (rostedt@goodmis.org) wrote:
> 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.

I'd really like to hear Avi's thoughts on this.

Thanks,

Mathieu

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