linux-kernel - Re: [F.A.Q.] perf ABI backwards and forwards compatibility

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Message-ID: <20111108113416.GA571@elte.hu>
Date:	Tue, 8 Nov 2011 12:34:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ted Ts'o <tytso@....edu>, Pekka Enberg <penberg@...helsinki.fi>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Vince Weaver <vince@...ter.net>,
	Pekka Enberg <penberg@...nel.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Avi Kivity <avi@...hat.com>,
	"kvm@...r.kernel.org list" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	qemu-devel Developers <qemu-devel@...gnu.org>,
	Alexander Graf <agraf@...e.de>,
	Blue Swirl <blauwirbel@...il.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [F.A.Q.] perf ABI backwards and forwards compatibility


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> The ABI yes, the tool no, the tool very much relies on some newer 
> ABI parts. Supporting fallbacks isn't always possible/wanted.

Yeah, sure - and an older tool cannot possibly support newer features 
either.

Thanks,

	Ingo
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