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Date: Fri, 3 Dec 2010 15:59:53 +0100
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Theodore Tso <tytso@mit.edu>, Arjan van de Ven <arjan@infradead.org>,
        Mathieu Desnoyers <compudj@krystal.dyndns.org>
Subject: Re: [RFC][PATCH 0/2 v2] tracing: Add conditional to tracepoints
Message-ID: <20101203145950.GB1711@nowhere>
References: <20101203040358.955427199@goodmis.org>
 <20101203144720.GA1711@nowhere>
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On Fri, Dec 03, 2010 at 09:53:12AM -0500, Steven Rostedt wrote:
> On Fri, 2010-12-03 at 15:47 +0100, Frederic Weisbecker wrote:
> 
> > Looks good
> > 
> > Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
> > 
> > I suspect we'll need to fix some scripts/subperf commands in perf. Those that do:
> > 
> > 	if (success)
> > 
> > tests after reading a trace from a wakeup event.
> 
> I  guess the question is, is that "success" part of the ABI or not?


The fact is: if old tools read new sched wakeup traces, the tools won't work.

Now the debate is always the same.