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Wed, 23 Sep 2020 07:27:34 +0000 From: =?iso-2022-jp?B?SE9SSUdVQ0hJIE5BT1lBKBskQktZOH0hIUQ+TGkbKEIp?= To: Oscar Salvador CC: "akpm@linux-foundation.org" , "aris@ruivo.org" , "mhocko@kernel.org" , "tony.luck@intel.com" , "cai@lca.pw" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: [PATCH v7 08/14] mm,hwpoison: rework soft offline for free pages Thread-Topic: [PATCH v7 08/14] mm,hwpoison: rework soft offline for free pages Thread-Index: AQHWkOhHhPSks/uu9Em9rYoCckvXQal11DCA Date: Wed, 23 Sep 2020 07:27:33 +0000 Message-ID: <20200923072733.GA15221@hori.linux.bs1.fc.nec.co.jp> References: <20200922135650.1634-1-osalvador@suse.de> <20200922135650.1634-9-osalvador@suse.de> In-Reply-To: <20200922135650.1634-9-osalvador@suse.de> Accept-Language: ja-JP, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: suse.de; dkim=none (message not signed) header.d=none;suse.de; dmarc=none action=none header.from=nec.com; x-originating-ip: [165.225.110.205] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 7bbad6db-5589-4011-fffe-08d85f9223a3 x-ms-traffictypediagnostic: TY2PR01MB1961: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; 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x-ms-exchange-antispam-messagedata: Fo/omSQoAXq5qCmESqMT0mdzPi3ZmnkUHoZ//cwzo6KZLktLEZ1Koqpv9yHIB4DelUEZKiU5jYTN7hHB9a1lMx9abgv4ND+FmaSFEAYg449khyGsY8aIWuOtkJzqYUa99FwFVh2e1r5kwCzm7Xv8Cu6r3PV+z3Qaqoo9j9X+/Zp2WbbN0A2Tm7QbzsjD1xm8ci9XO4AV+r0Y4S4T+yJ0vuGViHkgjmBLdVIVUQa4tEw87bBYJcceMury56JoWGLMEHbc14GOFf/XkAHFcP68Ygd0Ea1xOciaPJzQJ3OwHVhW48MIgVXxwiu3L9/TCeFeKc4qM13a48t4tlnN6rxSkIiHjlzIM/0Dr0tjzYFraDLzN/RB6deUnWfhs96SAca6eM7H9YETZgcz0p149gQ6VA0Ec9ndLT6O3fV4OiCWxkAa+1IK1AVyzwX2f/DOZS6+PflnbGT3yzCFcC9NdcB8ri1tD6CKgoa7KdEsSyzV63FwTgN+L5S1Ppx9nG3suIK5GRim/g6YqyMLZ3062nBzf5Qc4+jMoy+FpQDFXgz989o1idvmehvEmPnrHqSSEM8zRHJt3fteKw6wSWp5yYAiO5uOKxhAZ2DJgmPOP7/xkNI1dYQ+QbdR7bzblWxhhG26ZYuAkW387b/qIJ9aojtBjw== Content-Type: text/plain; charset="iso-2022-jp" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nec.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TY2PR01MB3210.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7bbad6db-5589-4011-fffe-08d85f9223a3 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Sep 2020 07:27:34.0039 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: e67df547-9d0d-4f4d-9161-51c6ed1f7d11 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: +Jm7kKGpxKJw2C1TDkNgqdy/8R4hEl24gjCcoGF7OZ6naad5FuFPIpzWxtsgYvkB52Mp1dhy/spSoAM/0AwOdg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TY2PR01MB1961 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000020, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Sep 22, 2020 at 03:56:44PM +0200, Oscar Salvador wrote: > When trying to soft-offline a free page, we need to first take it off the > buddy allocator. > Once we know is out of reach, we can safely flag it as poisoned. >=20 > take_page_off_buddy will be used to take a page meant to be poisoned off > the buddy allocator. take_page_off_buddy calls break_down_buddy_pages, > which splits a higher-order page in case our page belongs to one. >=20 > Once the page is under our control, we call page_handle_poison to set it > as poisoned and grab a refcount on it. >=20 > Signed-off-by: Oscar Salvador Acked-by: Naoya Horiguchi =