linux-kernel - Re: [RFC][PATCH 0/2 v2] tracing: Add conditional to tracepoints

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Message-ID: <20101203145950.GB1711@nowhere>
Date:	Fri, 3 Dec 2010 15:59:53 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>
Subject: Re: [RFC][PATCH 0/2 v2] tracing: Add conditional to tracepoints

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@...il.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.
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