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Date: Tue, 8 Nov 2011 06:31:50 -0500
From: "Frank Ch. Eigler" <fche@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Ted Ts'o" <tytso@mit.edu>, Pekka Enberg <penberg@cs.helsinki.fi>,
        Vince Weaver <vince@deater.net>, Pekka Enberg <penberg@kernel.org>,
        Anthony Liguori <anthony@codemonkey.ws>, Avi Kivity <avi@redhat.com>,
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        =?iso-8859-1?Q?Am=E9rico?= Wang <xiyou.wangcong@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [F.A.Q.] perf ABI backwards and forwards compatibility
Message-ID: <20111108113150.GA13195@redhat.com>
References: <CAOJsxLHvYo5zA+_m-AXuZHjAcGKE5q0ytmPCZ0Gye52LWq1p9Q@mail.gmail.com> <CAOJsxLG6kyq-RoQiBj0B_tThvOy1AxJf6XB2VfQFQJkwQ5cHcQ@mail.gmail.com> <20111106231953.GD4500@thunk.org> <alpine.LFD.2.02.1111070838520.1823@tux.localdomain> <alpine.DEB.2.02.1111071156230.28615@pianoman.cluster.toy> <20111107175942.GA9395@elte.hu> <y0mpqh3og3v.fsf@fche.csb> <alpine.LFD.2.02.1111072204370.3082@tux.localdomain> <20111107203514.GG24234@thunk.org> <20111108102235.GA1241@elte.hu>
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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