linux-kernel - Re: [Bug #11954] sysprof tracer ABI regression in 2.6.28rc1

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Message-ID: <20081117162431.GG12081@elte.hu>
Date:	Mon, 17 Nov 2008 17:24:31 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Soeren Sandmann <sandmann@...mi.au.dk>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Eric Anholt <eric@...olt.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Bug #11954] sysprof tracer ABI regression in 2.6.28rc1


* Soeren Sandmann <sandmann@...mi.au.dk> wrote:

> There are no ABI guarantees for the sysprof tracer at this point, 
> given that it is in debugfs [...]

to avoid situations like this, it would be nice to print out the 
format string itself in the trace header, in printf format string 
style. That way if there's a trivial expansion in trace format, it can 
be detected (and even followed) by user-space - without some ugly 
version based API.

	Ingo
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