From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from CO1PR03CU002.outbound.protection.outlook.com (mail-westus2azon11010008.outbound.protection.outlook.com [52.101.46.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 51FDD2798F8; Wed, 2 Sep 2026 14:17:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.46.8 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788358622; cv=fail; b=N9ZYqQ5Bx2Vh3Qcl7VPBVyW9nKMIA2Ryb4jvSe9Ju1IDN89oW89UsMUAQXmxJ6/SoP771F5MFHNNpsFeA3e2HIZi6K3o2SQ2ymfjgE1wZuD1/VifgYzuxGvfs0Y4PhDwylBJ8QnEXuDF1C/Xkauwju20EhJNga/7u/UNr9GlR6E= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788358622; c=relaxed/simple; bh=RvjEFnVgLs+8jTbnFDFEWi72YS9zWiflLATxhfZ3fdc=; h=Content-Type:Date:Message-Id:Cc:To:From:Subject:References: In-Reply-To:MIME-Version; b=XeSWs472V91XrwUtgpSSwcmCh5RDsYqiMbtgYLH/8os3HWqV2m3pnlZg/sQKqOYPYV9oEx/ubEjtCUuYQ/aLWWyhiI/Sjctd4NuZPbSJfJw+KH244f7CpoxyTp5oUO2Q9Yi9tqwMkuxGReXH3+tFm0NOE8BYUKlk2g4qWRajsjw= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=cUo0FRXg; arc=fail smtp.client-ip=52.101.46.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="cUo0FRXg" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=F6lUbXQgSk2iR5q3TSZC7Kb6VSUUF/SRE6LF+fvpIJ3sZgEOc4hzZg+jQZ314RiLYDHE4i4iZoVhRunupZ+bxxEhpuTNaqM1Y0hGn5RUdBmTVf4JuTedLt4KvdfP0IYD/kM1uqiqT2OzrqXs1dCqLdUTYsAEbMgBfRC+fg2hEl/urie6RfpNZtWmc3zHhJ4rwFuhRV+wHAxfbvOM4UVksBemoo1l4TjDz4MZdNhlbWFAlQims8SEGrHGliEdywkzhsy+bqN8tHFwVbo9LqTZYayFAJEPPEps/T41jjVvcVvPV/FeeB6kW30hRd2/dL3WGcgJYu1vaBoS44jO8gG7lg== 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=2Miuf6NFFGDj/xeqju29xmDwUM2Do9Wc8EizonD2Orw=; b=dHooAkDBagZWhKgguf27dfMYuNrDEU+AXBxNGyKzjRRcstLRyTPbCQRQ5F2UKlfXd/36gHXz90N0P7vZrt0p4KOvk27Og7xQ9yCk2TdQeoMVGnKuT8AP/n9+Acxx9Irt/Xd0Qbo5weu+t51WqzOggBweUKpvckLgtaHUIhWVJTW4TNpCbG5mJrkBCiC4jD8nYhs2vXsTwfeaCmE18NqeSKPh+oyQTyN9KmQcdpBpFGdHJiJe6k3QB9HUiip2XX9IpKETpMHyQoST4I7vf4dPFXCNjjRmw57CCp+kjwRMZ4p6u/7PAW9A+Os3SOmZtpdPSEF71srQwFWa4VxIoTGTIw== 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=2Miuf6NFFGDj/xeqju29xmDwUM2Do9Wc8EizonD2Orw=; b=cUo0FRXgedvCTuRtNN0zmQ4eMxCdqUsshW5VSD6wsbwv0qv4av0xZW7y/qdxeZwogi6fLDnQW9edwtbvBufuHun1mgZoK0+l5K3+s9pTi/jsZjD7VSIgYRYFA7WAlu6CSDsWddztWmZCYe7jpyQjs+qDkbseVJPU8HNP+7BDQUd4bMLxWtuz+3Y+0GHS/NzT49yO7viAngdQoVN9AXGXsPheakmCbAmtVUvzoMDJ8K26U9YyYrIQKnLI7ut4vbqT5P3AAVtKkOd4f0YJ+DYuZm/bndAMB5ATTKU8trZ/p+tMA/gGCbxzT06WXaDwR/6SSl2Ac6FkXOsO2IoOcVstsQ== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) by LV3PR12MB9214.namprd12.prod.outlook.com (2603:10b6:408:1a4::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.382.10; Wed, 2 Sep 2026 14:16:53 +0000 Received: from IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16]) by IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16%5]) with mapi id 15.21.0360.008; Wed, 2 Sep 2026 14:16:53 +0000 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 02 Sep 2026 10:16:51 -0400 Message-Id: Cc: , , To: "Yeoreum Yun" , "Andrew Morton" , "David Hildenbrand" , "Lorenzo Stoakes" , "Baolin Wang" , "Liam R. Howlett" , "Nico Pache" , "Ryan Roberts" , "Dev Jain" , "Barry Song" , "Lance Yang" , "Usama Arif" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Shuah Khan" , "Kevin Brodsky" From: "Zi Yan" Subject: Re: [PATCH v4 1/3] kselftest: mm: prevent random failure of huge page split for khugepaged X-Mailer: aerc 0.22.0 References: <20260902-fix_split-v4-0-85f03905f7b1@arm.com> <20260902-fix_split-v4-1-85f03905f7b1@arm.com> In-Reply-To: <20260902-fix_split-v4-1-85f03905f7b1@arm.com> X-ClientProxiedBy: YQBPR0101CA0232.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:66::13) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|LV3PR12MB9214:EE_ X-MS-Office365-Filtering-Correlation-Id: 10be5b8f-29cc-4aab-16ad-08df08fcd677 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|366016|376014|1800799024|7416014|921020|6133799003|11063799006|56012099006|4143699003|10067099003|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: acnNfCV06qa3MYkaCrFRCWU762rioB+9rer9BxMEpR//IIyhNy1aaAzFjcCRfOYt65oosQwX9OudYBNcmVWp0BMWVegelsSTKxP6Y7oScHb3uWnLOMoABwdz/desta21yBUqT52+YBKoOolFy1KhT2tQSU7uUwzkZ3XEP83p8FL+lMCqQhoB8YCSdVE3B+XgPgqaLQY+00RjwevzLwB2P0Tq723Subq35d5qQDVTW9Ot4qVI/KKJC58WSijmTWND4OfVKjibLjlXM9V2ZS3LyEsePThN6n2gLK5RoX3A2k87MQiyWswABqcp3hUM6PQsMBoExHAMChhNdJlblTyaULtgkIEO5bUP+Qhp1/69ALx11iJ203V8vZJM9G+KRCiRJlRCLvQ/DkGIM3/4BUeqpi56HftUsgsIga9XVkIfZelFj+MylndHZY0Y4KtKMYAzdazaaXhT9w0yr4etb/asgODuIaFbykofOfXKitiJRZWVnNT5rgBFSIfLSR0idXvWaHvtNV/a/+TRofjVSmpZd/K1m9uH5z7WevCO0FIXvPHVT+w3pqY4ZY8V7NJioVkwgwloZCPzyt5KwayFn9eGRd8+LRKUPdQq8cIZejsk0AA5SjYzGnDhE36fFy2ZnUEi3VACeTw5yhvcu9oy5PMRLXbfnQk4tkKFodObRsRwRJabEcawx9xE7MwQ+p/zi4HDlO+lYLQyyB154LBsX3jLsA== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:IA0PR12MB8374.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(23010399003)(366016)(376014)(1800799024)(7416014)(921020)(6133799003)(11063799006)(56012099006)(4143699003)(10067099003)(18002099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?UWs3TTRteU1mR1M4MnRRQWcvamtxWVBFSUhhS1ZHaU1pMTRSQWEwaWpEa1Js?= =?utf-8?B?ci9OMk9HVEdvNEZwLzVGWkNjd3paM0Mza0xHSWNldEtoV2V1UDUzeDhxNVZR?= =?utf-8?B?WGtwZ2NQTldJZE9iNkJoSmNoZmw1d2ROMVBrd1g1c3pNZDZJL05EK1FTR0hi?= =?utf-8?B?TzdkWStTZnEyalJJY3djM2plUGk2clNtZ1lXaUtOMy9PL1ZDRjNuRXgzK25h?= =?utf-8?B?T1FaUFdPU3h2TjZjcnoxNmt5bEo5NzNUblJRQ25VQWptVWcwY2QrV295blhJ?= =?utf-8?B?cHB4Z1BqZWFzM2kyL2dsT3FXdWsySlVqY3RNb21nVFJ5Rzc0U0ZxTll2UlhU?= =?utf-8?B?VlUraUhvdHNqNlR1REErZjc3dFRtVmFpV2hicEU5TUIzbXltSU16a1Y1aWVk?= =?utf-8?B?cEdsbzhCS0tQNm5Wd1dTbTFZS2o1Mis5S3JFaWg1Y1JpK1JFVUt2S3ZZdGRv?= =?utf-8?B?UDlzRThrR3huYVp0YmZTRWRTUjhHY1ExRlBNQmhURGhnYVEzYUZRdkJCaXNr?= =?utf-8?B?YThManc2ZGFRalhFTGhvM0Z2UWsxTWhrRVpuTWtxdG9wdXNicTdya2Q2a2dP?= =?utf-8?B?TlFXUVBvWTBnQzRiOGRqVGlTUXVDU1dFQUNBNlVEdGxPSEZpczNwMlFxdlBT?= =?utf-8?B?U1ZUdkxlcllCZWRnNjk4TElsMEM3NXBoRGhWZzhldCtTN1hxWnk4U0J3K2dI?= =?utf-8?B?QzkxT1hYSW1PYW5LMmN6ZnM2NStkc2gybnZURzl5YUFWcXYvWnNTUjRBVkJi?= =?utf-8?B?TXVFR3hGOG1TcnY3RE11MVFwN3c1Mk0yV1o2MHBhVzhnaER5QzdoNUhqNjhM?= =?utf-8?B?R1AyL2RObzBqdHZ3YVNoWVdaK25NTFYzOVRaamVpUFpoUytmQ2pBRXk3aXl0?= =?utf-8?B?eFIrMExEUE1ZT2VDazVnc1I4cVRxc1IrT2QzOU5uNXNtT05PQzdXOGpVTmdZ?= =?utf-8?B?amNtOGVialQxS2x5QUhHb2ZkRDhXdStYOW9GWVE3RVdNNHZLVFlwMTFUdGFR?= =?utf-8?B?RklKVklsVjZBeVdSb2NVYWM1NnU2dGROZUthRFZlZitTVXFiWWpNNkVhMVFW?= =?utf-8?B?b0YxSXVrc21hL2UyRlBJVXg1a0dvakFWTEppaWNDWDZuaitXQ2ZIcUNoR0ti?= =?utf-8?B?MFNqckV5Nm1qWDNabzhtKzFyVUo1ZXJod0psQmJGUitzSGYrWlVmNkc1ZSta?= =?utf-8?B?TUJqSFZOSjh6eUk3RnpJaDdFcERJanZ6NVVIQ1lJWFZkckpCTitlZWJSd3RH?= =?utf-8?B?MjI1TTVQMlBhSG96WUMrazBrWDl5S1QvUk80K1BQS0l1LzVSMVh6czdhT0Zv?= =?utf-8?B?SWk1MXpuUjh5OWdrZXhKa1pFUXhUTFNDVWcwL1RLUnVUWEd5MThRcnZWTDY1?= =?utf-8?B?OW82SVlyTFhzZGNydisyK28wQXFMdWxDakJLNzUxUUlzWXkvdFpJNnJqTDRC?= =?utf-8?B?Ujl5eXFxeUo0YnZjTmoyK2lkb28rUy9uR0ZBWWNtN01sRnRCaE1ZRmRiTHls?= =?utf-8?B?Yk1iMHpBdVV3WlcrWHdYdnB2OFBERVlYWGNIZ29LVjVwamk2ekpsS0NUZ1FG?= =?utf-8?B?WmFMZ0oyanJ1S0IxN0xaSGpuc2VxNG45UENrWTVTNnYxYlc2SE9PTVpsYkRL?= =?utf-8?B?ZjhlR082RTlnbHBXNHNrNExsY0hxcDlBNzRJL201YXpyT2dudUNrL1pMR1R3?= =?utf-8?B?VjhzR0xKdDkyMDBvcGRmVmRDRVlISS83SEdST1JQazgvckFOODJIVHc2S2lv?= =?utf-8?B?T3Q1MnExaFErMHFMOXFqdTc0ZmtxOWc5QVNRcUZNbjV2akpUT0ZNZmZmUXRi?= =?utf-8?B?eWZqeEU4K0RqRGNJMldGc0ZURkJFU3IwbFVnUnV6WGZDV3B6NjR3a3R3OXU5?= =?utf-8?B?UytrVWZVODU5ODhOQm53Mzh3amwyUE05R1luTU1Gd1hlYjQ0aCtnQmo0VHl5?= =?utf-8?B?OHFMOUpzL1dyc09SNmczU1ozellIZTE1cVpKSUFBV3pBQjlEOVJiM0ZDeWRy?= =?utf-8?B?Ym5MZUFSdXJZQnE0VEJvdEllZlNqcE5pUjIzSS9HMWlVaWQ0V3VyczBaMG5W?= =?utf-8?B?QXpiTEpFT3psTnBMeGJwMlJhNHh0WjZwRFQzR0VTdG1yN3BrMklFTWE4NnFR?= =?utf-8?B?UEpaNUI4NHNnMFVVOUppTUJKUWRQUkRlTHNlWnVVUkgyZWJ5U1YzK3VZWExL?= =?utf-8?B?NllCZ1JSODM1bXBmRnRPRlBHcEVSM201UTY1K2dEVlNmTU1TMnB5QUt0VDA3?= =?utf-8?B?QVE5MTBqWXNqcVNoWXZDODB5djRabGZwNXFTOUFuNmZ2dmpmZHF4TFpHdzFB?= =?utf-8?Q?5/mcW+CtMYkttN9RZS?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 10be5b8f-29cc-4aab-16ad-08df08fcd677 X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Sep 2026 14:16:53.4034 (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: hiwtKtt/Yn96h6Daa0RVykYBAgsSiz3Pm04hpThgo/JewTjOOOgrhE0LyW2Uj4dH X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR12MB9214 On Wed Sep 2, 2026 at 8:09 AM EDT, Yeoreum Yun wrote: > There're some random failure for split_huge_page_test when khugepaged > collapses pages into pmd again which had split by the test. > > Prevent the khugepaged's collapses for split page by setting the > mapped pmd-huge-page with MADV_NOHUGEPAGE before split. > > Suggested-by: Kevin Brodsky > Suggested-by: Lorenzo Stoakes (ARM) > Signed-off-by: Yeoreum Yun > --- > tools/testing/selftests/mm/split_huge_page_test.c | 19 +++++++++++++++++= ++ > 1 file changed, 19 insertions(+) > LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi