linux-kernel - Re: Perf ABI versioning

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Date:	Mon, 24 Jan 2011 22:28:38 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Thomas Renninger <trenn@...e.de>, tardyp@...il.com,
	jean.pihet@...oldbits.com, acme@...stprotocols.net,
	linux-perf-users@...r.kernel.org, mathieu.desnoyers@...icios.com,
	linux-trace-users@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Perf ABI versioning

* Frederic Weisbecker <fweisbec@...il.com> wrote:

> This may be generally useful to help dealing with tracepoint ABI changes.
> 
> But instead of a global tracing ABI number, I would rather suggest one number per 
> tracepoint subsystem (sched, power, etc...).

Nooooooooooo ... !!! :-)

Please lets stop this madness before it gets too serious: we dont do ABI version 
numbering in Linux, full stop.

We use 'natural' ABIs where the lack of an ABI component triggers some sort of 
clean, finegrained error. Like a -EINVAL on a not-yet-implemented ABI component, a 
non-existent file entry, or -ENOSYS on a non-existent syscall.

Such a design is arbitrarily backportable or forward portable, it's extensible and 
it is actually maintainable.

In the ABI version numbering direction lies Windows madness ...

Thanks,

	Ingo
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