From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-6.7 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id C1E867D982 for ; Wed, 14 Nov 2018 22:58:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728800AbeKOJDO (ORCPT ); Thu, 15 Nov 2018 04:03:14 -0500 Received: from mail-eopbgr770077.outbound.protection.outlook.com ([40.107.77.77]:54084 "EHLO NAM02-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727264AbeKOJDN (ORCPT ); Thu, 15 Nov 2018 04:03:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vmware.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=+xpGdvescWP3LrHUgpRKa1vg45gs/ylbZNH2ZHEPJ40=; b=H15JmMBerbBJ6MFeIAPXci/rFx81pqzHSsIYFGC3XIZpF21oaO2qN4flSHNfosdFNZDJ/1OmThsY48s8Xs9ayRWmv34QZLs5W20CMem3X+YxTe7HNA3ha6PiztiZXgmxyEK+5GGBBv0VsUdbUvWvKSSZ3+kNq6EHDuuRD6XJLlU= Received: from BYAPR05MB4776.namprd05.prod.outlook.com (52.135.233.146) by BYAPR05MB3992.namprd05.prod.outlook.com (52.135.199.16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1339.17; Wed, 14 Nov 2018 22:57:51 +0000 Received: from BYAPR05MB4776.namprd05.prod.outlook.com ([fe80::a1b8:a948:4c8c:747d]) by BYAPR05MB4776.namprd05.prod.outlook.com ([fe80::a1b8:a948:4c8c:747d%4]) with mapi id 15.20.1339.021; Wed, 14 Nov 2018 22:57:51 +0000 From: Nadav Amit To: David Hildenbrand , linux-mm CC: LKML , "open list:DOCUMENTATION" , "devel@linuxdriverproject.org" , linux-fsdevel , "linux-pm@vger.kernel.org" , xen-devel , Alexander Duyck , Alexey Dobriyan , Andrew Morton , Arnd Bergmann , Baoquan He , Boris Ostrovsky , Christian Hansen , Dave Young , David Rientjes , Haiyang Zhang , Jonathan Corbet , Juergen Gross , Kairui Song , "Kirill A. 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Wysocki" , Stefano Stabellini , Stephen Hemminger , Stephen Rothwell , Vitaly Kuznetsov , Vlastimil Babka , Julien Freche Subject: Re: [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are logically offline Thread-Topic: [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are logically offline Thread-Index: AQHUfG14AtUUXm8lq0WDadIpB+L9nQ== Date: Wed, 14 Nov 2018 22:57:51 +0000 Message-ID: <8932E1F4-A5A9-4462-9800-CAC1EF85AC5D@vmware.com> References: <20181114211704.6381-1-david@redhat.com> In-Reply-To: <20181114211704.6381-1-david@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=namit@vmware.com; x-originating-ip: [208.91.2.1] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;BYAPR05MB3992;20:689ymwZ6ohxKL013HXigJUZPZrl7O7yanyp/Afxmwtmbiiqf8FSCACQ5F7Sd697tZNiZnNBbX4JWDQgWVvxIC9GwySGb/Hm/VNp95YgRJVtVuKh0tpnS6U2Fu0P194OeoGxWGrumaADZFgN2hzKW5JHqczYxGEjfiTdevQG6g80= x-ms-office365-filtering-correlation-id: 3f620901-a23e-4660-9197-08d64a849b23 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390098)(7020095)(4652040)(8989299)(5600074)(711020)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7153060)(7193020);SRVR:BYAPR05MB3992; x-ms-traffictypediagnostic: BYAPR05MB3992: x-microsoft-antispam-prvs: x-ms-exchange-senderadcheck: 1 x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(6040522)(2401047)(5005006)(8121501046)(93006095)(93001095)(3231415)(944501410)(52105112)(10201501046)(3002001)(148016)(149066)(150057)(6041310)(20161123560045)(20161123564045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123558120)(20161123562045)(201708071742011)(7699051)(76991095);SRVR:BYAPR05MB3992;BCL:0;PCL:0;RULEID:;SRVR:BYAPR05MB3992; x-forefront-prvs: 085634EFF4 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(366004)(39860400002)(136003)(396003)(346002)(376002)(199004)(189003)(7736002)(4326008)(217873002)(71190400001)(2906002)(107886003)(71200400001)(6486002)(6246003)(39060400002)(83716004)(316002)(478600001)(82746002)(54906003)(25786009)(8676002)(305945005)(8936002)(81166006)(11346002)(256004)(446003)(110136005)(81156014)(105586002)(6436002)(36756003)(68736007)(106356001)(486006)(33656002)(53936002)(229853002)(476003)(6506007)(53546011)(99286004)(5660300001)(14454004)(76176011)(86362001)(6512007)(26005)(2900100001)(2616005)(7406005)(7416002)(66066001)(97736004)(6116002)(3846002)(102836004)(186003);DIR:OUT;SFP:1101;SCL:1;SRVR:BYAPR05MB3992;H:BYAPR05MB4776.namprd05.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: vmware.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: wevEr1sOZMJYdzxtBr2O7m+XEHOnJeQg9xrBJkfcGxwcPJjiNtPInmerI7PGT5PNLobYFkVecrvdVOeurk8M8Ls4orwOykFPgh3A/7DhUWvXhER9sAxdrkmgQvYoTO4Q75f1H/018hIOnmgm0kBQ+TACNUXJxcJF4tOfYNhQQT0GaAZ1UcNZ/GXmYyuLZsAD5iD++qvCaRLGGz3wR55a3Jy7HrfY/vfEuj9zf4NCy3ep/dNgK9rC/PqL+3iOS+JxVyw327TB24w8BkIBQ/mrlo8BnuwLkW5H6C7CDenLDwoB64zRAZ4yGDU3ODq6RdA+0/g4+StSoWLPSzFqUm2uznBdDAClVTvFV/id+kJrQPo= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-ID: <8127D4BDFD768A4B9EE74019E7FFB6E1@namprd05.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: vmware.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3f620901-a23e-4660-9197-08d64a849b23 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Nov 2018 22:57:51.3910 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB3992 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org From: David Hildenbrand Sent: November 14, 2018 at 9:16:58 PM GMT > Subject: [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are logica= lly offline >=20 >=20 > Right now, pages inflated as part of a balloon driver will be dumped > by dump tools like makedumpfile. While XEN is able to check in the > crash kernel whether a certain pfn is actuall backed by memory in the > hypervisor (see xen_oldmem_pfn_is_ram) and optimize this case, dumps of > virtio-balloon and hv-balloon inflated memory will essentially result in > zero pages getting allocated by the hypervisor and the dump getting > filled with this data. Is there any reason that VMware balloon driver is not mentioned?