From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753389Ab1KHLgT (ORCPT ); Tue, 8 Nov 2011 06:36:19 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:33503 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753312Ab1KHLgQ (ORCPT ); Tue, 8 Nov 2011 06:36:16 -0500 Date: Tue, 8 Nov 2011 12:34:16 +0100 From: Ingo Molnar To: Peter Zijlstra Cc: "Ted Ts'o" , Pekka Enberg , "Frank Ch. Eigler" , Vince Weaver , Pekka Enberg , Anthony Liguori , Avi Kivity , "kvm@vger.kernel.org list" , "linux-kernel@vger.kernel.org List" , qemu-devel Developers , Alexander Graf , Blue Swirl , =?iso-8859-1?Q?Am=E9rico?= Wang , Linus Torvalds , Arnaldo Carvalho de Melo Subject: Re: [F.A.Q.] perf ABI backwards and forwards compatibility Message-ID: <20111108113416.GA571@elte.hu> References: <20111106231953.GD4500@thunk.org> <20111107175942.GA9395@elte.hu> <20111107203514.GG24234@thunk.org> <20111108102235.GA1241@elte.hu> <1320748366.2244.15.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1320748366.2244.15.camel@twins> User-Agent: Mutt/1.5.21 (2010-09-15) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Peter Zijlstra 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:33645) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RNjyU-0000Wy-9P for qemu-devel@nongnu.org; Tue, 08 Nov 2011 06:36:19 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RNjyO-0002ni-FE for qemu-devel@nongnu.org; Tue, 08 Nov 2011 06:36:18 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:54897) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RNjyO-0002nJ-76 for qemu-devel@nongnu.org; Tue, 08 Nov 2011 06:36:12 -0500 Date: Tue, 8 Nov 2011 12:34:16 +0100 From: Ingo Molnar Message-ID: <20111108113416.GA571@elte.hu> References: <20111106231953.GD4500@thunk.org> <20111107175942.GA9395@elte.hu> <20111107203514.GG24234@thunk.org> <20111108102235.GA1241@elte.hu> <1320748366.2244.15.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1320748366.2244.15.camel@twins> Subject: Re: [Qemu-devel] [F.A.Q.] perf ABI backwards and forwards compatibility List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Zijlstra Cc: Alexander Graf , Ted Ts'o , Arnaldo Carvalho de Melo , "kvm@vger.kernel.org list" , qemu-devel Developers , Vince Weaver , "linux-kernel@vger.kernel.org List" , Pekka Enberg , Blue Swirl , "Frank Ch. Eigler" , Pekka Enberg , Avi Kivity , =?iso-8859-1?Q?Am=E9rico?= Wang , Linus Torvalds * Peter Zijlstra 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