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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id A84F3C433EF for ; Mon, 31 Jan 2022 22:38:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 053418D002C; Mon, 31 Jan 2022 17:38:49 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0012E8D0028; Mon, 31 Jan 2022 17:38:48 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E0CA38D002C; Mon, 31 Jan 2022 17:38:48 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0103.hostedemail.com [216.40.44.103]) by kanga.kvack.org (Postfix) with ESMTP id D28CC8D0028 for ; Mon, 31 Jan 2022 17:38:48 -0500 (EST) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 92ACB99EAD for ; Mon, 31 Jan 2022 22:38:48 +0000 (UTC) X-FDA: 79092048336.07.9B8C5A8 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by imf05.hostedemail.com (Postfix) with ESMTP id 81056100007 for ; Mon, 31 Jan 2022 22:38:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1643668727; x=1675204727; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=M7mZJap8bWp6kqusTez3NXr8dHFfMt8bmhpv8eupywQ=; b=Mr6Wo+slwuRwTlGJzxzospzTFWCjBbvxYO+2BqnvbDzOZVPxlbrBa0cV Fk5I/hftg1IVOsVOcj4irATkM98pZGI3sKeyek/7XBiP6dt8/GGhTAaf6 SuLGS3jx2FBOlCkK+BeF6aUIWTLzusnaWDEobURzD2wD8fI814AqUllq9 n9i4bCPkKKERugPo/J/gnsIgb2bMNoeGC1ncKB9+PjuRKnN3mZkItToeY ij+a2M/VqJD2X/NHfBK02BVE00R0h7AvrREJq52RzPWxK9trA4Uc8XeSQ Z4jq+y5ie8E6BHlMjJq4ckElI5FW1JK3XdV4u8FghrM/SrkaMgPcg+6JF Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10244"; a="333921604" X-IronPort-AV: E=Sophos;i="5.88,331,1635231600"; d="scan'208";a="333921604" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jan 2022 14:38:45 -0800 X-IronPort-AV: E=Sophos;i="5.88,331,1635231600"; d="scan'208";a="630180014" Received: from kcoopwoo-mobl1.amr.corp.intel.com (HELO [10.252.132.7]) ([10.252.132.7]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jan 2022 14:38:45 -0800 Message-ID: <101a4497-ae17-ab69-640d-667c79da639b@intel.com> Date: Mon, 31 Jan 2022 14:38:42 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCHv3 2/7] efi/x86: Get full memory map in allocate_e820() Content-Language: en-US To: "Kirill A. Shutemov" , Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel Cc: Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Varad Gautam , Dario Faggioli , Brijesh Singh , Mike Rapoport , David Hildenbrand , x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org References: <20220128205906.27503-1-kirill.shutemov@linux.intel.com> <20220128205906.27503-3-kirill.shutemov@linux.intel.com> From: Dave Hansen In-Reply-To: <20220128205906.27503-3-kirill.shutemov@linux.intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 81056100007 X-Rspam-User: nil Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=Mr6Wo+sl; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf05.hostedemail.com: domain of dave.hansen@intel.com has no SPF policy when checking 192.55.52.43) smtp.mailfrom=dave.hansen@intel.com X-Stat-Signature: c43p56j489xu6a4rsawiqw1pebp7oeas X-HE-Tag: 1643668727-734381 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 1/28/22 12:59, Kirill A. Shutemov wrote: > Modify allocate_e820() to get a full memory map. Dumb question time: why doesn't the current code get a full memory map? This looks simpler. What's the downside? Memory consumption?