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Date: Tue, 8 Nov 2011 06:31:50 -0500
From: "Frank Ch. Eigler" <fche@redhat.com>
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Subject: Re: [Qemu-devel] [F.A.Q.] perf ABI backwards and forwards
	compatibility
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To: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>, Alexander Graf <agraf@suse.de>, Ted Ts'o <tytso@mit.edu>, Peter Zijlstra <a.p.zijlstra@chello.nl>, "kvm@vger.kernel.org list" <kvm@vger.kernel.org>, qemu-devel Developers <qemu-devel@nongnu.org>, Vince Weaver <vince@deater.net>, "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>, Pekka Enberg <penberg@kernel.org>, Blue Swirl <blauwirbel@gmail.com>, Pekka Enberg <penberg@cs.helsinki.fi>, Avi Kivity <avi@redhat.com>, =?iso-8859-1?Q?Am=E9rico?= Wang <xiyou.wangcong@gmail.com>, Linus Torvalds <torvalds@linux-foundation.org>

Hi -

On Tue, Nov 08, 2011 at 11:22:35AM +0100, Ingo Molnar wrote:

> [...]  These examples show *PICTURE PERFECT* forwards ABI
> compatibility, using the ancient perf tool on a bleeding edge
> kernel. [...]

Almost: they demonstrate that those parts of the ABI that these
particular perf commands rely on have been impressively compatible.
Do you have any sort of ABI coverage measurement, to see what
parts of the ABI these perf commands do not use?

- FChE