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=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 07C18C433E3 for ; Thu, 13 Aug 2020 07:54:31 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B2C1120838 for ; Thu, 13 Aug 2020 07:54:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="g3vcirPt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B2C1120838 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=citrix.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 18E6D6B0022; Thu, 13 Aug 2020 03:54:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 13ECE6B0023; Thu, 13 Aug 2020 03:54:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 055256B0024; Thu, 13 Aug 2020 03:54:30 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0050.hostedemail.com [216.40.44.50]) by kanga.kvack.org (Postfix) with ESMTP id E47336B0022 for ; Thu, 13 Aug 2020 03:54:29 -0400 (EDT) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id A0EA45823 for ; Thu, 13 Aug 2020 07:54:29 +0000 (UTC) X-FDA: 77144783058.30.face39_5f01e5326ff2 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin30.hostedemail.com (Postfix) with ESMTP id 70E73180B3C83 for ; Thu, 13 Aug 2020 07:54:29 +0000 (UTC) X-HE-Tag: face39_5f01e5326ff2 X-Filterd-Recvd-Size: 3289 Received: from esa4.hc3370-68.iphmx.com (esa4.hc3370-68.iphmx.com [216.71.155.144]) by imf12.hostedemail.com (Postfix) with ESMTP for ; Thu, 13 Aug 2020 07:54:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1597305268; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=rGN7NkgwAEJ2ZoHEFH2PZFIIR5lqiIJQgzR9gZfV/kA=; b=g3vcirPtPE2NUUUriKOvjwh3HDD4v3fzIKRM0CfPXSxK9HbtjtYI5T9i HH5WxK/AY/6JJUcKFS0QRYrUn7PUrh7zwqc1yyyIAhUglC+jcqfvNNa8H UMxmLUyTiCi4c3Vl90Eh6B7fsFJLy/xMIbgnfhIDXKSKfSkQFuXC0oMRZ M=; Authentication-Results: esa4.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none IronPort-SDR: CGSiRuy2FL5NWfWVjPwjPdUkwaXeWvnbYbwr1LMb9ijYk9TC1E3fzgAdL3b7/HEUVoIhaFwOcY LldZ9H5V7RCULb3EzXbTcKv+9jW4Izfb8ohyOjU/Rzbis8IYyY2I6ssIynObdLwWN6SbOfCx+a J+d51tvpvZ93irUqTW2TmiQpr7YQ2OBIlh5tPB2LlNGJTF6MFbUVL4bf+wZdsLjH9FqpEy0zIH yEZJki2K7FUIF5I5QW6R0issxNrrro1Hc/n+2ZZLNoFohSszUpeW7S+QZzXY/xuUSGLmrLuv63 nSQ= X-SBRS: 2.7 X-MesageID: 25349268 X-Ironport-Server: esa4.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.76,307,1592884800"; d="scan'208";a="25349268" Date: Thu, 13 Aug 2020 09:54:20 +0200 From: Roger Pau =?utf-8?B?TW9ubsOp?= To: Christoph Hellwig CC: , Oleksandr Andrushchenko , David Airlie , "Daniel Vetter" , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Dan Carpenter , Wei Liu , "Yan Yankovskyi" , , , , David Hildenbrand , Michal Hocko , Dan Williams Subject: Re: [PATCH v4 2/2] xen: add helpers to allocate unpopulated memory Message-ID: <20200813075420.GC975@Air-de-Roger> References: <20200811094447.31208-1-roger.pau@citrix.com> <20200811094447.31208-3-roger.pau@citrix.com> <20200813073337.GA16160@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline In-Reply-To: <20200813073337.GA16160@infradead.org> X-ClientProxiedBy: AMSPEX02CAS02.citrite.net (10.69.22.113) To AMSPEX02CL02.citrite.net (10.69.22.126) X-Rspamd-Queue-Id: 70E73180B3C83 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Aug 13, 2020 at 08:33:37AM +0100, Christoph Hellwig wrote: > On Tue, Aug 11, 2020 at 11:44:47AM +0200, Roger Pau Monne wrote: > > If enabled (because ZONE_DEVICE is supported) the usage of the new > > functionality untangles Xen balloon and RAM hotplug from the usage of > > unpopulated physical memory ranges to map foreign pages, which is the > > correct thing to do in order to avoid mappings of foreign pages depend > > on memory hotplug. > > So please just select ZONE_DEVICE if this is so much better rather > than maintaining two variants. We still need to other variant for Arm at least, so both need to be maintained anyway, even if we force ZONE_DEVICE on x86. Thanks, Roger.