linux-kernel - Re: [patch] introduce TRACE_EVENT_ABI (was Re: TRACE_EVENT

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Message-Id: <1253714632.4498.3.camel@frodo>
Date:	Wed, 23 Sep 2009 10:03:52 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>, mingo@...e.hu,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch] introduce TRACE_EVENT_ABI (was Re: TRACE_EVENT_ABI ?)

On Wed, 2009-09-23 at 08:43 -0400, Christoph Hellwig wrote:
> I'm not sure we can support any as an ABI yet.  The text format seems to
> volatile in general - not just the output of the individual trace events
> but also the common file format, and for the binary format we need to
> figure a good way to tag the output yet.   Also when we define one as
> one ABI we should make very clear what that means, e.g. does it have to stay
> exactly as is?  Or can we add new fields but not remove old one?

I had this discussion with people in Portland. We seem to agree that
this should just lock the old fields in, but you can add new ones at the
end.

-- Steve

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