From nobody Mon Feb 9 11:33:23 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1562179189; cv=none; d=zoho.com; s=zohoarc; b=USHe4i68oIeiwljndgKxx3kEeYaejL1MdVgy6yUPr5opVj90yJX+t7sBUAs6vRkQkfET01VwS5EcAM4MeD7S7pcsa5E2kl3NPiqaiAJvwMsFc/X9heJh/Q63Ue5O0cTvwxq+P/07EFGHtqMFQo7LFSdHRcIgfqJx2iioh+y63i8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1562179189; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=jrp0vlfNW1XTMz056ejIprWq2DAZ5pLhY3E2D7DMOV8=; b=danH0pxVySsruozet6BKdj9DLAEjMcpDu0DNKpIYv2og3s4ZGjy0bCnEzhh94HevNmmGz8hfAqbO49G2lEdWGBPN+CD67MGUVCwrJEMj+MTgGNhLDciCVfUcogqu1LfNvN2UcWJEnN4Qtj01VRR+VM6WVSVS2nVoXRroJMRYICM= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1562179189735390.04545197855896; Wed, 3 Jul 2019 11:39:49 -0700 (PDT) Received: from localhost ([::1]:38492 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hikAQ-0000Mb-MD for importer@patchew.org; Wed, 03 Jul 2019 14:39:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56574) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hijg2-0004YG-0R for qemu-devel@nongnu.org; Wed, 03 Jul 2019 14:08:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hijfx-0000Wz-SA for qemu-devel@nongnu.org; Wed, 03 Jul 2019 14:08:16 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52868) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hijfx-0000WV-IA for qemu-devel@nongnu.org; Wed, 03 Jul 2019 14:08:13 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D1C5A356CD; Wed, 3 Jul 2019 18:08:12 +0000 (UTC) Received: from localhost (ovpn-116-30.gru2.redhat.com [10.97.116.30]) by smtp.corp.redhat.com (Postfix) with ESMTP id 63BA9173B9; Wed, 3 Jul 2019 18:08:12 +0000 (UTC) From: Eduardo Habkost To: Peter Maydell , Paolo Bonzini , qemu-devel@nongnu.org, Marcel Apfelbaum , Richard Henderson Date: Wed, 3 Jul 2019 15:07:01 -0300 Message-Id: <20190703180726.31267-19-ehabkost@redhat.com> In-Reply-To: <20190703180726.31267-1-ehabkost@redhat.com> References: <20190703180726.31267-1-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 03 Jul 2019 18:08:12 +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: [Qemu-devel] [PULL v4 18/43] numa: deprecate implict memory distribution between nodes 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: Igor Mammedov Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Igor Mammedov Implicit RAM distribution between nodes has exactly the same issues as: "numa: deprecate 'mem' parameter of '-numa node' option" only with QEMU being the user that's 'adding' 'mem' parameter. Deprecate it, to get it out of the way so that we could consolidate guest RAM allocation using memory backends making it consistent and possibly later on transition to using memory devices instead of adhoc memory mapping for the initial RAM. Signed-off-by: Igor Mammedov Message-Id: <1559205199-233510-4-git-send-email-imammedo@redhat.com> Signed-off-by: Eduardo Habkost --- numa.c | 3 +++ qemu-deprecated.texi | 8 ++++++++ 2 files changed, 11 insertions(+) diff --git a/numa.c b/numa.c index 7d449c7e95..c1f5e84fa5 100644 --- a/numa.c +++ b/numa.c @@ -410,6 +410,9 @@ void numa_complete_configuration(MachineState *ms) if (i =3D=3D nb_numa_nodes) { assert(mc->numa_auto_assign_ram); mc->numa_auto_assign_ram(mc, numa_info, nb_numa_nodes, ram_siz= e); + warn_report("Default splitting of RAM between nodes is depreca= ted," + " Use '-numa node,memdev' to explictly define RAM" + " allocation per node"); } =20 numa_total =3D 0; diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi index 44c9a95966..2fe9b72121 100644 --- a/qemu-deprecated.texi +++ b/qemu-deprecated.texi @@ -104,6 +104,14 @@ In future new machine versions will not accept the opt= ion but it will still work with old machine types. User can check QAPI schema to see if the lega= cy option is supported by looking at MachineInfo::numa-mem-supported property. =20 +@subsection -numa node (without memory specified) (since 4.1) + +Splitting RAM by default between NUMA nodes has the same issues as @option= {mem} +parameter described above with the difference that the role of the user pl= ays +QEMU using implicit generic or board specific splitting rule. +Use @option{memdev} with @var{memory-backend-ram} backend or @option{mem} = (if +it's supported by used machine type) to define mapping explictly instead. + @section QEMU Machine Protocol (QMP) commands =20 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0) --=20 2.18.0.rc1.1.g3f1ff2140