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 27E8AC10F1A for ; Tue, 7 May 2024 16:28:50 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B77E86B0098; Tue, 7 May 2024 12:28:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B4B3A6B0099; Tue, 7 May 2024 12:28:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 99D5F6B009A; Tue, 7 May 2024 12:28:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 7A13B6B0098 for ; Tue, 7 May 2024 12:28:49 -0400 (EDT) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id E3C7AC0B33 for ; Tue, 7 May 2024 16:28:48 +0000 (UTC) X-FDA: 82092133536.02.24855FE Received: from NAM04-DM6-obe.outbound.protection.outlook.com (mail-dm6nam04on2058.outbound.protection.outlook.com [40.107.102.58]) by imf29.hostedemail.com (Postfix) with ESMTP id 008B6120003 for ; Tue, 7 May 2024 16:28:45 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=PbmBmYoD; dmarc=pass (policy=reject) header.from=nvidia.com; spf=pass (imf29.hostedemail.com: domain of jhubbard@nvidia.com designates 40.107.102.58 as permitted sender) smtp.mailfrom=jhubbard@nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1715099326; 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=MPolYrSEfKTT6LLHz10WmO4L3kB5TFUp75T3mMLXB/w=; b=hTMEYw7CfwKzSANc5b7vyat9o1MGDp3ydLHAwreyzSfXmz19pvC+fqQ3D4IWFFsqFRVhB/ 0JKZyoKj7qK4d8ntN/f5R3q/pz+JZo7i7LP79QuR7MTpf9wgG7UcwJbyDv/H0i8nqFQTJa W/txSbGBRBUwu9mRLZ0ZVysyXPLPnT0= ARC-Authentication-Results: i=2; imf29.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=PbmBmYoD; dmarc=pass (policy=reject) header.from=nvidia.com; spf=pass (imf29.hostedemail.com: domain of jhubbard@nvidia.com designates 40.107.102.58 as permitted sender) smtp.mailfrom=jhubbard@nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1715099326; a=rsa-sha256; cv=pass; b=BilTubsHSXYA1OhYkpFlWeVEkQezhZyTQjIy6nRcy6HV1+vBAdHExNarmNX5glz/BnbkGt XeFZ9WurFRzNhToqS6oTxysZG8uhG7yZUfvgX/zV3paDwLAuMeXjYO1SgEYd/RswnvstU6 cIpx6cerlKlLPWiIhLoG6A9bsQ9jSCI= ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=HrGT5xpav/FNqFNm2GCNtKaDRpzxARXSmECD/r6dKsWuNLdQh58IYNrhconozQX1l72nmDa8ZIktfjt9GO2I2BoKCbO3UDpEuvYYgOU81LBv4Aq4qbpHMKsPQx+fUTIm9URUwN4u6AkJycV8XCULX1nPEfN1uAqYbnY5C2v8ZAU8Mope9enUCTZ7fX/l2fZASqKWPAn3kSzYEWJEbAhum17YPVp58B/HB6jsH35n8ABk6OtyNBYgSLuFTUtSR5qfPtoPHoL1eH3ClVgia9mnu6svoLv8xxEwcRMc+Wa5rePPKJh/V4PzzIF57ofiFflY5cU27DbgxsTmnf1dkaKsfA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=MPolYrSEfKTT6LLHz10WmO4L3kB5TFUp75T3mMLXB/w=; b=G0YddfCI0VUWIS80Y05cmUktk6SDZuQCjT3RBEo+tCYmTLGu21LHNGtjEVXBgxyh9RhPnzRbjAu0fkP48V+POK7oWBIC/Fs+IbDFt8wnAxWwtFnW+nwbDemVGCPGu06+pJDmvQWagcNqhMjcXJH6HeslaGfU5p17y3BXV5L/DwpGAB9/NcNTQjI52UyVqQrNqw24lp+ZXxEiLgc8CPkcvxuXTYfCAgXAhLLnnyVMoHzrriFzkj+nipoMcHrR0jCXRAdba3FhiotZL8jYRlo843Y03lIMA60RZyDC49M0YXga0VLUwv3Ur1nOtc5ikftVrdQa57OW/jbRUlA76cxMcg== 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=MPolYrSEfKTT6LLHz10WmO4L3kB5TFUp75T3mMLXB/w=; b=PbmBmYoDpTxkfUz427cRessfAyRiE3UmPraM5UYQbQQ/Vx6Qxsl16zhhkFb5eq6Y4yUFL74a1E5fkXa1n7IDBuVDcDENoFry9pc29p0qxr2WQwQ9BuJZLE/X2dG1Pv7XGN+FFy3NHpU8oA22rMIX12MEXpfMTv3aYXcACIQ8kRGlkqt8E44b/WyIzn50YQcLaBsIGSQ/ANG4Yv8djC4p+o3HcEqLwhMBrvmVWqsBBf1qDH/VL3cTWdDh63coG7gM4hsJPAqdU6f1iGwUp0GGEqCRM08KcYft2ku1kduj1nYd6hgqisaVn7FS4ya74v9KDu6H47vDDESLZkk3PQA5ow== Received: from DM6PR12MB4140.namprd12.prod.outlook.com (2603:10b6:5:221::13) by SA0PR12MB4432.namprd12.prod.outlook.com (2603:10b6:806:98::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7544.43; Tue, 7 May 2024 16:28:41 +0000 Received: from DM6PR12MB4140.namprd12.prod.outlook.com ([fe80::5b0:8154:dfef:2cac]) by DM6PR12MB4140.namprd12.prod.outlook.com ([fe80::5b0:8154:dfef:2cac%3]) with mapi id 15.20.7544.041; Tue, 7 May 2024 16:28:41 +0000 Message-ID: <302d50ac-45ff-470e-90a0-b349821706a6@nvidia.com> Date: Tue, 7 May 2024 09:28:29 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] x86/fault: speed up uffd-unit-test by 10x: rate-limit "MCE: Killing" logs To: David Hildenbrand , Andy Lutomirski Cc: Dave Hansen , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H . Peter Anvin" , LKML , linux-mm@kvack.org, Peter Xu , Axel Rasmussen References: <20240507022939.236896-1-jhubbard@nvidia.com> <016d8cff-efc3-4ef1-9aff-7c21c48f2d69@redhat.com> Content-Language: en-US From: John Hubbard In-Reply-To: <016d8cff-efc3-4ef1-9aff-7c21c48f2d69@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BY5PR13CA0006.namprd13.prod.outlook.com (2603:10b6:a03:180::19) To DM6PR12MB4140.namprd12.prod.outlook.com (2603:10b6:5:221::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR12MB4140:EE_|SA0PR12MB4432:EE_ X-MS-Office365-Filtering-Correlation-Id: a4d18185-f1cb-40ca-b140-08dc6eb2c18f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|7416005|376005|1800799015|366007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?TjhlcHVJeTJuQTJjN3B0UEY0N0k1WlNKOFMwZm1EMzQ1WFNJT3Rlc0d6MHVx?= =?utf-8?B?emdPU2t6eFl0S2pmVXBtWjh1ODB0TUFhQTdJMmJPelhyemRYVmJSNVZmNlQ0?= =?utf-8?B?eVhkeFViYnNDa25qd1NWOCtQUFlvSjRoKzZ6K0taZEI2R1pkalZKbE54UHFz?= =?utf-8?B?aG1nWUdhaTFJak5scStid0s2UmF5L0xDbGZCWFJJUVBsMFVtVzRyQ01CUVZq?= =?utf-8?B?SUw1eXhwZFpjVTE4L015ejRqSW5TbWJyR2ZlajJtcHZxV25ZUjZNQlcvWVJt?= =?utf-8?B?SkNrMFF4c0JiaXZsM252UWlrb0F3WDU5cGJxbEpKSU5pVVVBc01nbE1Nd3By?= =?utf-8?B?NGhHY2hoVnFiR3VBOUdQMThXQXRXclN4aTd2YW1qVGNhQkhqdEtPNlR0S3U0?= =?utf-8?B?WVZ2S1EyK01CZ1JMd1Nya0d2QUxUTnVLUWVTV1E2MVVGRHFkQVpLSnpwRi9W?= =?utf-8?B?WUxxYTFMbTMrbkJBMGxFUmF4RnprSEtYMDlkRGY5REM0VU9MZU5Tekl4K2F3?= =?utf-8?B?WjRFRVVCNzFpMThuenRjSittYUkycWVENFdKS1MzcHBUTmd0WXVBUGJaa3Zx?= =?utf-8?B?NC9vOU1ZeWhFSSt2QmYrNjlETllMWVpTb2I0QWpBd1hLQXNkNGZRUEg0OUcz?= =?utf-8?B?amlRNXpxR1c1N2IrZjZmTDFaVFc1OTFYSzM3aU0xYzFkRU5PbTh6VHlXdkZW?= =?utf-8?B?NkhtL3o2Uk9xZHpEUmhFVURTdXZQTnlSNlFwYnF4cTBRN2E4N2ZHMjRhNnJM?= =?utf-8?B?SHF5QmJhNDkwU0hyU29ZZDN0emJHbXJBdkc5T2VlRTdqWmdxL050SnVIRVZE?= =?utf-8?B?eFF5dmpxSHNSdkhtRTE1L0ZoUzdxWVJpWGw0d2xrZ2owUWRkeVRORS81cFpD?= =?utf-8?B?NEUwOW9BNUlUNHc3bEY3LzZVUTgxTXBrazUrZEZydnlCK0c5L0NkQklqSFo0?= =?utf-8?B?SzJTdWpBQ0FUaFNLampObVIrdHpOekxzN09wbGtUOHAvNFJweGE5QjFGSXF4?= =?utf-8?B?NStLSDJjVlZJYVpzQmt4N0cxSnM4eUQ1OWRCWTJXRjVLc2dJcXR1U0htN2wr?= =?utf-8?B?aFArNmdadVpjOFExWnA3OVplMjd0azVwQlJZa3p4MCsraWNUUStiWlYyQVlk?= =?utf-8?B?WTBudE41SW5nYmlTYUIxdVYyNUh3Y1hvQUd3WEtyUVo0S2ZVTjRMa1NwcDRn?= =?utf-8?B?VmZxWGZkZDRTeXZnU1UvMHgxdEo0cGV5MngzbDUzbmhtS2hzUlczRmQ3aGZB?= =?utf-8?B?TTVrajE0WFViR3haQzc5WGhyQ3ZodVpkZjl2QTNQQitCbzJMbm5YZjhWM3Nv?= =?utf-8?B?ekpjMkZ4S3A3bzA3SzFFY2ZRMXZrUWdOejVRMWp5eHVoTmJzY1dtR2hYK3Ju?= =?utf-8?B?WkVVVlp1amI4YWE3ZXhLZEp6SEpqbzBNaktCVU9YWlJjTXVKYjJra0dteE80?= =?utf-8?B?YjY4MnM2aDcxVm9OcVdtUGlxWWIzdUJGTmJ1RzNqRlM0Z29GS1BhUStVbDRD?= =?utf-8?B?RjRGUlRpbHJzR01UanVlTFZBREpMOTdrYU8xdCsyY2FtTjdIM0FiYm80cERJ?= =?utf-8?B?ZVB6dVhReFgyT3BDLzdWdUgxcnA4UDZneUJyYjBQaGkrWDhZZndiTFk5VHJH?= =?utf-8?B?ZU5sUG1tbHgrNWxTUmZkMk5LTzRrYlBpVExsbFBzUUQzNXdSMU5jdksrcEtx?= =?utf-8?B?SVB5ck9FSFhPWllrNjZnVGlLQStJM2tSc2QyK1RFcHl0YjNsTjZsVjZ3PT0=?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR12MB4140.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(7416005)(376005)(1800799015)(366007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bnZPOWIvRTZPbzlWR0NvRUE5dk5CV0c1c2lvWHE3OUMzWHFnU0hlYTBvTksv?= =?utf-8?B?azE3NEpYU3k5UVQvbGhYKzRFSTNQS3VPM2hnSnE1cStIZHl3K25tbnZmUXdC?= =?utf-8?B?TkN4ZVQ1ODVMMFFkUVpacXB2bWFwYUE0K2JJZDJ2eFZTZWw4bXY5eXIxOU40?= =?utf-8?B?NWRhSE5Zc1FvK2RtRzlCMVVSTXhhY2xmMFIzV2JyVWljcW5DbHc5Tjc5UEts?= =?utf-8?B?bGxERU9kU2NZOGxxSXdTOHROVGRBZWZ1KzI3aTl5emRvYzJJZ2pUblNGaXpX?= =?utf-8?B?YUorUkk0NSs5NG9IOVZVR1QrYnY3eXFyZ0p3eHpFSlRDcFNvemt4WWdSM2da?= =?utf-8?B?Qi92UXVPZGlFdTVyamQ0UlNUTGE1ZE0yNjJUQk10ekJCcVZINEhxRXhlem1k?= =?utf-8?B?NjJkRzIzV05NTVBPT29nWUl2YWx3cXZBRzBUTEF5SzJ2MGlLK2ZrdEJHTXB2?= =?utf-8?B?M2pqMFcwcWpRVGc2ZVJ0NEhzNW5udVZUODdLMTIwbWZNRjk0UlVCbHFnWkly?= =?utf-8?B?Z05jZG5HUEUvalpnZTA5QTViTmRBZUVIY3A1M1FUb0lGK3BDMnI4citvVVhy?= =?utf-8?B?YWJxYXNqbDFKVjkxQVNDTkNNdkZRUU9mb3NabkNjSng0ei9mdUlUUFc0S3Q1?= =?utf-8?B?Z2VJZUtTWHJWWWtNUm5USk9ua0NjaklMaG9OR1pVUi84VjlLRHBFS3FoSW5m?= =?utf-8?B?d0ZFL1I0aGRZYXpPSVljRzVlU1FLb1ZDRjQyYTNxSEljZmtmMGFqUXpZbHFh?= =?utf-8?B?blJCeTdHTDRyU29VZ253c3l5L2dXN2JVMVcvdDFWeFk4eXVZb2cyWWRpZjlm?= =?utf-8?B?VHZtMFAwSVFFY0xmVXpQUTNSd0hMY25QR2lpeXN4UGJXcUw3QWpuMnIxYUF0?= =?utf-8?B?czZoaVRDVGhkOTNGUU4vdnJaN0s2NHNHOXJlR3REdms2T09kQUFqcDBNb210?= =?utf-8?B?M2QzdFM2RmpyLzE1ZXJhQmJsSlI2eUZ2dmZNdEVIOFp3aml5RXROS2dVNUF3?= =?utf-8?B?WFJFWWJvTlNqRTliSENUa0EvOEQvMTcyak03NDVaUVQvT2dSRzRFSVkzRURO?= =?utf-8?B?V2JvV1JucGdBZXpVVEJ3VGRFUFNheW43MlN4b2FGcms3U1kxYXAyM1F6aVVa?= =?utf-8?B?Qml1bWFTYnlWZ3ZkbzNxNEkvdGYvdmlUWlh4ZWJ6MkJjTHZZTi9HMmdBZno5?= =?utf-8?B?UXBRSXd6RmxBWGZDd2F5Wjh4emtyeEJ0bm5JRWFKOS9nb0pFOTdFZ1Qzcllr?= =?utf-8?B?UlpuRzNialdBa1NjamtoK0ZPZXlJYUw3WHBXcmx5Mmw3RHdlei8wL0htL05D?= =?utf-8?B?bVRmUlFmZloxcWZyZ3p1blFNTkNVcWVjcXBOb2dQeEFhR0pMSWF4ZUw1R3VG?= =?utf-8?B?cEhsYkI3N2k3QlVvNnljdHArYUNvUDBMRFlaaVFlcEVvYTdicGlWc2dkeEJp?= =?utf-8?B?ekRMY2I2OWhxMTQ3L0RWUlJnSUlub2JEZXNOV01SeHlxVnVmUXdqRUJvd3hK?= =?utf-8?B?TUlmM0VkektCUC9sZ2JXMkh1R1RtcFJpb2RrSUx3N2lYZGZXQkNKTUl0QktL?= =?utf-8?B?TkNGZTdyZUhHME5FTWNBekpxSG53Q2daelBVV01KOGd5VjEweDhoR1ZVeWxt?= =?utf-8?B?UTNGaythdTFPc2F1NTE0NEpNRUFMS1ZsRFZuVThjTXFaRWwrdWtjQlRxTWU2?= =?utf-8?B?bkNpUDVXN0swc1lWeXVtYUhDdExwL0w0ZUdCYTA0eUlEdDRSUm9NajhLM1Z5?= =?utf-8?B?N2UyM0RuWllsU0tFSVlCRlVmemJqZXpLTWF3cytQbXBNdkQ0am9VSDJtYnFG?= =?utf-8?B?akFHTGNYakNMK2JVeDdHS0wxVVE0V3RKMDRnbjYrV0dXRHlpN255a3VIVEJN?= =?utf-8?B?bjhCdExYQ3VSWGVCalhHWjl5cUwzdmJUTXhLNTVpTFhHNm5UdmcxbHRoanQr?= =?utf-8?B?L0RielVyUEEzKy9jcDBqYllpcFNubDdrdktJVkZjM3lQc0JoM21mMHY5S3Jo?= =?utf-8?B?UnQ0MUtCWGl5U1dpZk1zaUxSamlxS1dEcnZMUm9iZzhtNk52a05qWXdJeUsw?= =?utf-8?B?NjAwZlVBZmxoc1dOWC90ZXZmOGpySXFHeXJGTkl6NC9KUGUwU0twVE4xUU9I?= =?utf-8?B?ZThaa1NJODFnbWtGT3o3cWJ0N0FvMm15dExCVXdLMVlDQUt5VktDb2YyYTdv?= =?utf-8?Q?S7s8U+ns5kZLV6bcQftsV6M=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: a4d18185-f1cb-40ca-b140-08dc6eb2c18f X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB4140.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 May 2024 16:28:41.1545 (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: 0txLQCQpCkmCSxv1ZZCfFWZJW9GYn3v71r3cJDa1H7Jt81Ai47BajMkGj2ozPM4CYbcZHI5hd8TxhtPPM/vD8w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4432 X-Stat-Signature: 4ccbjgm448m9zghskcjznukp7x79huim X-Rspamd-Queue-Id: 008B6120003 X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1715099325-83779 X-HE-Meta: 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 sexMg72h uPpU1T8GxRLh7c87jXHqVUwlV7sPMWbhgJ5S+v0c5JTcY9t661ctjUSXtnKPIxku5UWkoYAELEiwNQx7PljFtDW3zhcx//mOuyTtc61SBQPG1xtqbSFmQxdMj12UVszQnbsyBSGXMDU/EPv1cuf2FD9Cp3EB/h4SlAcBl1/XgiuE3J7QTyXlQmpkkUswf57PF/T8zM2Mm6IFaPwdxyxsctMfAs1XP/upE66uMzQnAo4Z3UTjhucladWlgZM4kOnLB8ZoF8smuWySXadeqQs7WD0QMF8kqJ0KaNJj6frWWjRiWMxDEpQ9/ZH1/Kw== 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 5/7/24 1:13 AM, David Hildenbrand wrote: > The patch subject is misleading. This should be "don't flood the system I went back and forth on that subject line. :) > log". Nobody cares about the speed of a unittest ;) Yes they do. People should actually run the selftests, which in turn have enshrined their guidelines in kernel doc. See dev-tools/kselftest.rst, "Contributing new tests", which says, as you would hope, "Don't take too long". It's important. Tests need to be quick, and having one out of 50 that blows it up is worth fixing. > > On 07.05.24 04:29, John Hubbard wrote: >> If a system experiences a lot of memory failures, then any associated >> printk() output really needs to be rate-limited. I noticed this while >> running selftests/mm/uffd-unit-tests, which logs 12,305 lines of output, >> adding (on my system) an extra 97 seconds of runtime due to printk time. > > Recently discussed: > > https://lkml.kernel.org/r/a9e3120d-8b79-4435-b113-ceb20aa45ee2@alu.unizg.hr > > See the pros/cons of using ratelimiting, and what an alternative for > uffd is that Axel is working on. > > (CCing Peter and Axel) > That thread seems to have stalled. I *do* have MCE experience (writing a handler, dealing with MCEs and related bugs), and what they wrote so far is exactly correct: if you were going to flood the log, then no, we don't need to see every single line printed. The first 10 or so, plus the fact that rate limiting kicked in, is sufficient to proceed with debugging and/or hardware replacement. I'd like to just do this patch almost as-is, just with a fixed up subject, perhaps: x86/fault: rate-limit to avoid flooding dmesg with "MCE: Killing" reports Yes? thanks, -- John Hubbard NVIDIA