From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0954BC43218 for ; Tue, 11 Jun 2019 13:41:38 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D253720896 for ; Tue, 11 Jun 2019 13:41:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D253720896 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:59100 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hah1s-0005l4-LN for qemu-devel@archiver.kernel.org; Tue, 11 Jun 2019 09:41:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55820) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hah0R-00050D-9U for qemu-devel@nongnu.org; Tue, 11 Jun 2019 09:40:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hah0Q-0000TZ-Ci for qemu-devel@nongnu.org; Tue, 11 Jun 2019 09:40:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33494) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hah0Q-0000Sg-7C for qemu-devel@nongnu.org; Tue, 11 Jun 2019 09:40:06 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CEC282F8BCE; Tue, 11 Jun 2019 13:39:59 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-148.ams2.redhat.com [10.36.116.148]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9AA2317DC2; Tue, 11 Jun 2019 13:39:59 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 2BCDC11386A0; Tue, 11 Jun 2019 15:39:58 +0200 (CEST) From: Markus Armbruster To: Paolo Bonzini References: <5cf62de9.1c69fb81.66fc.8f4fSMTPIN_ADDED_BROKEN@mx.google.com> <1e9e4edd-f4ad-d8d6-95a2-e0aeab89510d@redhat.com> <5cf7b6e6.1c69fb81.1cdca.e260SMTPIN_ADDED_BROKEN@mx.google.com> <003b01d51f72$5e6f4160$1b4dc420$@Fursova@ispras.ru> <67806828-f666-0c9c-00fc-b520f15013d9@suse.de> <98826c5f-4a74-5364-2aef-28a10db12c20@suse.de> <39250506-f38f-c440-5728-7b970d32ab41@redhat.com> <79b821a4-7cc0-2461-7ca4-d71c3e5ee4ef@suse.de> <87o934sdot.fsf@dusky.pond.sub.org> <8d391b41-bf6d-b83b-7b22-25fefa18c518@redhat.com> Date: Tue, 11 Jun 2019 15:39:58 +0200 In-Reply-To: <8d391b41-bf6d-b83b-7b22-25fefa18c518@redhat.com> (Paolo Bonzini's message of "Tue, 11 Jun 2019 12:31:24 +0200") Message-ID: <87ftogp7f5.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 11 Jun 2019 13:39:59 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] qgraph X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?B?J9Cf0LDRiNCwJw==?= , Andreas =?utf-8?Q?F?= =?utf-8?Q?=C3=A4rber?= , Natalia Fursova , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Paolo Bonzini writes: > On 11/06/19 10:56, Markus Armbruster wrote: >> Yes, this is how introspection (both QMP and QOM) is commonly used. >> Just keep in mind one difference: QMP is static, QOM is dynamic. >> >> QMP being static means it's defined at compile time. So is the value of >> query-qmp-schema. Same QEMU build, same value. This permits caching. >> >> QOM being dynamic means to introspect an object's properties, you have >> to create it. Worse, an object's properties may (in theory) change at >> any time. *Properties*, not just property *values*. In practice, I'd >> expect properties to change only at realize time. > > Right, and we should move more towards class-based properties so that > the dynamic nature of QOM is only used for the bare minimum needed (e.g. > memory regions). What are we doing to make new code conform to that? What are we doing to update existing code?