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 D4A7BC7115B for ; Mon, 23 Jun 2025 14:28:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 777066B00CF; Mon, 23 Jun 2025 10:28:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7276D6B00D0; Mon, 23 Jun 2025 10:28:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5C8606B00D1; Mon, 23 Jun 2025 10:28:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 4BE136B00CF for ; Mon, 23 Jun 2025 10:28:51 -0400 (EDT) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 1B537C05B4 for ; Mon, 23 Jun 2025 14:28:51 +0000 (UTC) X-FDA: 83586896862.27.DB1712A Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2059.outbound.protection.outlook.com [40.107.223.59]) by imf20.hostedemail.com (Postfix) with ESMTP id 4F6BF1C000E for ; Mon, 23 Jun 2025 14:28:48 +0000 (UTC) Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=mbwtfVg2; spf=pass (imf20.hostedemail.com: domain of ziy@nvidia.com designates 40.107.223.59 as permitted sender) smtp.mailfrom=ziy@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1750688928; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=3byKriXNQENGCPIN7VsI4Rz/pkNWde3jeasyUU/GvHU=; b=NprMu3oEu9Ao/e5iHaCmlnDX9ZRpHirXrbnzzm2CIpy6w2Us4cYAjXWpKNFliCb+mPDARh AgKCFQkHRKZmosHRRtORNNwsPZdxg/SydYRjNdLdAJ/aghkGrxgnVxorA4MC8p6FPktAli 0eqyz7JshmpUEHZ7ZX2+gJTGh3uqUjk= ARC-Authentication-Results: i=2; imf20.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=mbwtfVg2; spf=pass (imf20.hostedemail.com: domain of ziy@nvidia.com designates 40.107.223.59 as permitted sender) smtp.mailfrom=ziy@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1750688928; a=rsa-sha256; cv=pass; b=yuOr3/Zl8WwrXpXeuOZXxnR8mc1u6xk48vlSVWkRPCoAQgLAy0yswKHK9sBsiD/45kXjSx Mjku6UIlD2Q2jtBbsHTPptN/OTPqIjYi9zid4U+o7unbvChlmMWqxEYlwBrT6Yf9wvbJuB xs2ZeGIrQ3utUJE6j4OINYihGsOFWs0= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=oz5wU8tpjjsw9kkB8zvIfI6jgmWjjNvSzVfp4yHQYOSalyV5R88UCBKp3bR4Ph5pQ+t7fVc0euB816H3tKjpspbJArRtVyn90rop0To/tcX6AjUfeWIF+CPKfFLKC502xa46gFa+qLEFp2+8P4rgsj6sUCHvZy8lXuRi810LiKHCsRDS+u7+tRjE3xuFjd/w09jBUgwud8uhGhFM1VPor0PbABXFxdEtmhcw51p7duB81dyz/zrAFVi9AH9K2ks6FY1FqLmQ9WU7wE2dnKlFKVMz8O3ggGCoEFB/KewuXMtcYStAFwLDeCbHmJPuKf277zLGOyGh9i0+v6oYTMikLw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=3byKriXNQENGCPIN7VsI4Rz/pkNWde3jeasyUU/GvHU=; b=p+PyfZVF5oVzM6cBxbzqEMPKdWT35axWBgxMho6HqqYcvlSdiKP/kBRLgNFaxYBiL/e5/mfNtImIGt9MX61/JY1frifXaQWHddP0fj2msrWH3pVBMdja8dj+nL/s4/iBptUJA+LIJ0iTKaGFA5m9gcm1cNyTMDgO9Y6TPAEphFYL3lHughDakILgYtmi11e9Tu2zb/4pNOHxmr1dF8X1lbFvDK/XkSElJ8MQsK7vTqP0s6Op3guOUwFFdWesdDCq175tnZ60F0nB7f25lxCfqeR+xqfoHThcZKtWI5ts2zdFxgzZpi7q7iMCAlmDk7b/S5Sq1eTe/foprWxl37SCqA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=3byKriXNQENGCPIN7VsI4Rz/pkNWde3jeasyUU/GvHU=; b=mbwtfVg2z1+o0Vh98wwi5Sagy3VH363Btr5pdMY1DWmUc7jRMiD/lx3bkPyRmMmeVJ1fOWe7kemz2l5+WPNRhjMFCo2rxpqPMfqlYJUAfBnZ/qX+ErB3e0OXb8vmuog4ucnp2GD0zcNTeV+14cXS9asl3kqCl0o28taL0vzW/Z9ATzg39eaJjSmjRdnZlhj9TnO8LXC+av+Ak5e9fWN6w3i4MwedSet9SkKai8P0RoXTCMaKZExyXdgLjby67J8C3lUk7Dub0nVPomyCY1X6WFKBLScitE8QXv0tlJoY7SZHSP50HEX+friig6v4nhOHEkuF6Ibu6zEGIlgTVJOQag== Received: from DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) by IA0PR12MB7750.namprd12.prod.outlook.com (2603:10b6:208:431::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8835.28; Mon, 23 Jun 2025 14:28:45 +0000 Received: from DS7PR12MB9473.namprd12.prod.outlook.com ([fe80::5189:ecec:d84a:133a]) by DS7PR12MB9473.namprd12.prod.outlook.com ([fe80::5189:ecec:d84a:133a%5]) with mapi id 15.20.8835.037; Mon, 23 Jun 2025 14:28:45 +0000 From: Zi Yan To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux.dev, linux-fsdevel@vger.kernel.org, Andrew Morton , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Jerrin Shaji George , Arnd Bergmann , Greg Kroah-Hartman , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , Alexander Viro , Christian Brauner , Jan Kara , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Minchan Kim , Sergey Senozhatsky , Brendan Jackman , Johannes Weiner , Jason Gunthorpe , John Hubbard , Peter Xu , Xu Xin , Chengming Zhou , Miaohe Lin , Naoya Horiguchi , Oscar Salvador , Rik van Riel , Harry Yoo , Qi Zheng , Shakeel Butt Subject: Re: [PATCH RFC 27/29] docs/mm: convert from "Non-LRU page migration" to "movable_ops page migration" Date: Mon, 23 Jun 2025 10:28:39 -0400 X-Mailer: MailMate (2.0r6265) Message-ID: In-Reply-To: <20250618174014.1168640-28-david@redhat.com> References: <20250618174014.1168640-1-david@redhat.com> <20250618174014.1168640-28-david@redhat.com> Content-Type: text/plain Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MN2PR19CA0069.namprd19.prod.outlook.com (2603:10b6:208:19b::46) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB9473:EE_|IA0PR12MB7750:EE_ X-MS-Office365-Filtering-Correlation-Id: 9d5c4ae6-6064-4e8e-4d13-08ddb2624265 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|366016|1800799024|7053199007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?eMpqVdOoXB7ghW3z6ELVIG3SzXFJ28yY2WMGfMu7oMH7f81enCNpEVtmXS9u?= =?us-ascii?Q?nueyVFqN3CQjVjlCKhCH7s+OguLJ+s1WLS5QlJAHnPojz7Q3IQug4Xh6vmkt?= =?us-ascii?Q?zXKFm7EOfUKQwTCVGdWNw/V4cRRcGh+4WBYSI8XvaibFZym5aXnuz986ewks?= =?us-ascii?Q?pyzRVuRh4yfk6QCNx/xdvtfX6m8VPZhH9hcn4E5fD+EgOX0oAczU67pKaYQq?= =?us-ascii?Q?HW9aRftT7MXjKQAnxl5yaQ9L9mW29LoBZtGN7k0ujzb8ScQfcbwyQdpGOaqn?= =?us-ascii?Q?ZghtJYVrv4x6n6qzE3Q0pQEC1rq7jEhvL2qlO2+uD5OMWBWw8Cx6FK0TcZk2?= =?us-ascii?Q?TpIg4rWsJprNRnDx04oGxXVO1/fcRLJfoXWLFOpByYrx7ZSqHkBq317o6zpH?= =?us-ascii?Q?TsJYRtLKCdwvGL52dtgtb1wYArWCAd3I5jphmuBQa9ErfSrqxfysxdP+hVXR?= =?us-ascii?Q?FBJTDfmWFB/pJbek/1k7sqHuhhLEM/nVpKEw1Rei3bz02Vs/sw+aOBkdJRZB?= =?us-ascii?Q?bieG2VrqZbgthp5m/Rc8/oYLkudrtQA4a20mOOfOK0JFhm7NgjvJK70XJK4B?= =?us-ascii?Q?dUUqA1NE4wqtnjNOXX1wyP12lezqraur4L1AtmDUYi6+jAaKquHVnuqBODgo?= =?us-ascii?Q?Gbr+Lew7JvD7o+xs2dvi2vx1KQm5iNlUs2EqwX2a/BysGGVcUNv1xXvxQUaT?= =?us-ascii?Q?txBk+iu4kEi83b4JzAMGQ4y7BT0BW83g2WnkzEg67PasBy0b77aXVMWduqhp?= =?us-ascii?Q?mTa5ztU87VWtG07wW1tav4wPKVeSXQxl50HrXyXa83CwoPPtL//diA87k6xp?= =?us-ascii?Q?BU8Ywi9WUJrgQ/7/oDJQ2JJQkUStaXAE1mk8GnP8n8qU/qIuOlF7s7VSLw+A?= =?us-ascii?Q?5nMhlEnuRedHYcMp++SO0bXsyCuVZ8+U1HtwKDylrNvAWz8Z7t+EuchO30yK?= =?us-ascii?Q?vj17lpffWwGVltjx84lxKNo4JuC2TyPBSaptC7z5QvNyhcyzLawHQHDr2d+M?= =?us-ascii?Q?wITpfL54z6GoYeIu/g822dNWGZ+JldwuFhM3VSz6mycdxIGGyAu8WCJ/kMTd?= =?us-ascii?Q?sDnuXFy26pGDEnzsYeetqec8aoprYpnattgUKQWlleSI/1r/FuFJt06t6V4E?= =?us-ascii?Q?l4w3KVXoCTA/HDMZKGkg2BdcIZnTkn34ulN1RXhA8FYQgDn7cCu281MtKhvS?= =?us-ascii?Q?R3v4a/NqZvIufwAAYo36NFVJ6TQ/zWzn7Xw5I7ISl9IBfpuGb/mXHtiTFw3K?= =?us-ascii?Q?E4FWe8loX73tkq1uyKFmRWj4AcfnXAMJlxPHMYlLDZoMYCIoDIK4+7VqUzf5?= =?us-ascii?Q?qrCX4QRWJHJQFk5gC+T744MgerkxC6RYNE3o3UW80b0qDSjPKISf+k8ToTyD?= =?us-ascii?Q?gs3vS7OcZ9+yBiHlVIQwQ7aHBTjO/CwTJcdmMI3pnpLf1ifI1twhLyf4SBjq?= =?us-ascii?Q?wiG6rxWM/3M=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR12MB9473.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(366016)(1800799024)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?YdNm2z7RrdscpiPO47iq5v7zHkZS7Uq+KK+xOYIM44EBU5yfHx3N9N8cWkK+?= =?us-ascii?Q?+SmX3oLqWKV3T4iQ26Jj6y8yy363nnDzzsoqCaZ0mohFRDxXX+L08UGXhP5T?= =?us-ascii?Q?5Dfu6/8F4iOCnaggkECzVNYAUPz0qlojE0y94lJiq9XxR3WVdWGXwB6kPYsC?= =?us-ascii?Q?zdshuVrbycujjoZUVboHIxutZNDO1Rmmcctyh9UpcJd/UiKesK22F8TqobS7?= =?us-ascii?Q?BXZ+CS29Gr+BBqr4ZS9nLdaPNH8Pj22ifvUmDjgeV5YNMuE9+2pxM/vMPYG3?= =?us-ascii?Q?RS47foW2mMaCq+5bn3nf8cZjMTGv4LaRBE5A9gKpti2UQhQEZzbaXO9+8rYR?= =?us-ascii?Q?fJBV/OSEc3q0+mhSp8hmXO4E07Xf5VArYnygsbng7WodNALItg6/oQampxZH?= =?us-ascii?Q?f6pZB0GhoIOvqRjXwVIKEBHmf3XotzBa5AfUAnS7BQE3gd528UM28Sv5ne2o?= =?us-ascii?Q?xdj0undBfGEyjLyjG0NVVRatGVSAvyQmSIet+aTikoPWjECAY7/H7HYNUzYS?= =?us-ascii?Q?J0h4a8/m5k/5qNEfUwiHZe/uIwTLH7YiWtFQHtIY931haD2ffFRaxonYOScH?= =?us-ascii?Q?dQu7BFvu0XFX0gFQs5GcM4ki+B8oxRzZPOE4WU/AYDQ/H2X1qrEWRaHUxVT/?= =?us-ascii?Q?ztOuO126/uLgQ1FQLrKLYzXQUNp0aT0xT6/Xcwm3JTNR96giVvAcraQTiCDi?= =?us-ascii?Q?2rSmCXPO5cMlzR3RuobZ5T7zNT/PiWOO8TZaK9eINdWHRXMzrPyCOemz6gzz?= =?us-ascii?Q?N2CMRU+Udj4iiiCcU7GmY+0lJN+imHzL0B3ZkRmWS7x2YA4EZmRni7CQBUyv?= =?us-ascii?Q?WXgdCSZm8Oq275JY0X5vCaknn27g3lEs3OJxjFQ/gKWL6nj2WKIuDhCkl/aX?= =?us-ascii?Q?Q38ZfOyQnXB1bDpwUWKngWW9/P91RKinzzA1lq63nQ4HhYDGrXrS5QqlHw/h?= =?us-ascii?Q?Cz3Ji4RoPxcQX7pLbm/TMqae4ic0UKgEUrf7cPh+HwZklkMMHW1CPq4OOoT/?= =?us-ascii?Q?R8LFCZom4beVQc8UzNqJTPUt+g1RYtsiv0vWxJYO/HTQOwOxHU6lWirJRcPv?= =?us-ascii?Q?SiwZRKxHpiNW9T/qPBqrHL30CV6Qjh6bEng4SOmfq/HSO5z1XVWTMbNYsN1i?= =?us-ascii?Q?TWc05p4LPP5wAMWAwK+5SN0uiRmK1kBlHn6woZVBqmWjvClWPyXdpQdnQaQP?= =?us-ascii?Q?6xSC51YMbosnA87A+ulmGUenTOC4RKukp9k/HMOwtJQfAgZy/x8W4z58kL+3?= =?us-ascii?Q?SbC01G5MFAW/2jYEHrLk10VCg1nAVMhQJx2bepwk9QfAN/BEsuirca6hJkSJ?= =?us-ascii?Q?mM/Qi3m3DYlNnHF2hLmDO6Y9eEMG5MjfRqoXL4GyoEACnnyTg74nAy8bfEL3?= =?us-ascii?Q?KvzdoQxvQOVkXnHHSFIEXfjI+NzI12q/MIG6y8av0YvCrnXbjWP3qCaudqln?= =?us-ascii?Q?msoigtdn8x8HntfEwCNHXA3Y0Jsx5Eye5o1qshk9M5JZ0v9c6/fryurC97QY?= =?us-ascii?Q?R2e29g3p7fYm4Acpzr59tFlKg83d+oZwznq6YvGjjwOnmNtXvF0t+z5+6cmz?= =?us-ascii?Q?PCmfErSUBm4IYaSvkeE3J+Wos2oAQ5tpxXd/lGlv?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9d5c4ae6-6064-4e8e-4d13-08ddb2624265 X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB9473.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jun 2025 14:28:44.9338 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 47xiaHPJcRngZ+B5so4VGeb0TbESRd98Jmr6VVk7RgTVfNXz/xr3mjC/IvIXNYe5 X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7750 X-Rspamd-Queue-Id: 4F6BF1C000E X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: ai4usbwnyfhdx8uin8kktp4q1o3ubjkb X-HE-Tag: 1750688928-777985 X-HE-Meta: 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 1NuzlEuN 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 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: List-Subscribe: List-Unsubscribe: On 18 Jun 2025, at 13:40, David Hildenbrand wrote: > Let's bring the docs up-to-date. > > Signed-off-by: David Hildenbrand > --- > Documentation/mm/page_migration.rst | 39 ++++++++++++++++++++---------= > 1 file changed, 27 insertions(+), 12 deletions(-) > > diff --git a/Documentation/mm/page_migration.rst b/Documentation/mm/pag= e_migration.rst > index 519b35a4caf5b..a448e95e0a98e 100644 > --- a/Documentation/mm/page_migration.rst > +++ b/Documentation/mm/page_migration.rst > @@ -146,18 +146,33 @@ Steps: > 18. The new page is moved to the LRU and can be scanned by the swapper= , > etc. again. > > -Non-LRU page migration > -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > - > -Although migration originally aimed for reducing the latency of memory= > -accesses for NUMA, compaction also uses migration to create high-order= > -pages. For compaction purposes, it is also useful to be able to move > -non-LRU pages, such as zsmalloc and virtio-balloon pages. > - > -If a driver wants to make its pages movable, it should define a struct= > -movable_operations. It then needs to call __SetPageMovable() on each > -page that it may be able to move. This uses the ``page->mapping`` fie= ld, > -so this field is not available for the driver to use for other purpose= s. > +movable_ops page migration > +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D > + > +Selected typed, non-folio pages (e.g., pages inflated in a memory ball= oon, This is a great clarification. Thanks. > +zsmalloc pages) can be migrated using the movable_ops migration framew= ork. > + > +The "struct movable_operations" provide callbacks specific to a page t= ype > +for isolating, migrating and un-isolating (putback) these pages. > + > +Once a page is indicated as having movable_ops, that condition must no= t > +change until the page was freed back to the buddy. This includes not > +changing/clearing the page type and not changing/clearing the > +PG_movable_ops page flag. > + > +Arbitrary drivers cannot currently make use of this framework, as it > +requires: > + > +(a) a page type > +(b) indicating them as possibly having movable_ops in page_has_movable= _ops() > + based on the page type > +(c) returning the movable_ops from page_has_movable_ops() based on the= page > + type > +(d) not reusing the PG_movable_ops and PG_movable_ops_isolated page fl= ags > + for other purposes > + > +For example, balloon drivers can make use of this framework through th= e > +balloon-compaction framework residing in the core kernel. > > Monitoring Migration > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Reviewed-by: Zi Yan -- Best Regards, Yan, Zi