From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:45765) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RNVuh-00089A-Eh for qemu-devel@nongnu.org; Mon, 07 Nov 2011 15:35:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RNVug-0004ol-6Q for qemu-devel@nongnu.org; Mon, 07 Nov 2011 15:35:27 -0500 Received: from li9-11.members.linode.com ([67.18.176.11]:44963 helo=test.thunk.org) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RNVug-0004og-1j for qemu-devel@nongnu.org; Mon, 07 Nov 2011 15:35:26 -0500 Date: Mon, 7 Nov 2011 15:35:14 -0500 From: Ted Ts'o Message-ID: <20111107203514.GG24234@thunk.org> References: <4EB6BEFA.6000303@codemonkey.ws> <20111106183132.GA4500@thunk.org> <20111106231953.GD4500@thunk.org> <20111107175942.GA9395@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: [Qemu-devel] [PATCH] KVM: Add wrapper script around QEMU to test kernels List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Pekka Enberg Cc: Alexander Graf , Arnaldo Carvalho de Melo , Peter Zijlstra , "kvm@vger.kernel.org list" , qemu-devel Developers , Vince Weaver , "linux-kernel@vger.kernel.org List" , Pekka Enberg , Blue Swirl , "Frank Ch. Eigler" , Avi Kivity , =?iso-8859-1?Q?Am=E9rico?= Wang , Ingo Molnar , Linus Torvalds On Mon, Nov 07, 2011 at 10:09:34PM +0200, Pekka Enberg wrote: > > I guess for perf ABI, "perf test" is the closest thing to a > specification so if your application is using something that's not > covered by it, you might be in trouble. I don't believe there's ever been any guarantee that "perf test" from version N of the kernel will always work on a version N+M of the kernel. Perhaps I am wrong, though. If that is a guarantee that the perf developers are willing to stand behind, or have already made, I would love to be corrected and would be delighted to hear that in fact there is a stable, backwards compatible perf ABI. Regards, - Ted