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 54368D0EE34 for ; Fri, 11 Oct 2024 20:15:23 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9A4796B00A5; Fri, 11 Oct 2024 16:15:22 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 955566B00AB; Fri, 11 Oct 2024 16:15:22 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 77F8B6B00AC; Fri, 11 Oct 2024 16:15:22 -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 524656B00A5 for ; Fri, 11 Oct 2024 16:15:22 -0400 (EDT) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id E21D781108 for ; Fri, 11 Oct 2024 20:15:17 +0000 (UTC) X-FDA: 82662425958.09.4D21259 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf03.hostedemail.com (Postfix) with ESMTP id 01A1120005 for ; Fri, 11 Oct 2024 20:15:16 +0000 (UTC) Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b=cZ5MLuGo; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=ccA0Qteo; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf03.hostedemail.com: domain of jane.chu@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=jane.chu@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1728677579; 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=SHDAJP0o99fdmlCJH34NCzlIn93zbtykzhZj34fjpJ8=; b=vkYQSSTYboEdwbgG7i2BPAMPoiKQpjFsNfn37nItGVd8nPrE1+lFwh48LS/FzWRZek49Ow 3Ez+VuWSxsbDsaIp5xshCyod+2n8NDqxrOsjJYVRxGncX3zl9R1/JgpWwZA6QlUyHztwCm 0hZnK54mJqf7Wa9N3I4PgwnLfQzLP54= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1728677579; a=rsa-sha256; cv=pass; b=0L48f8sWHRygSB/4G3UPrvBhERvoXhhVo7LCYf4EtRb9hGw8u8JSyra68Deie4AFUFLHB1 WyOYtTFxHAZQZzv/fspHZZ6qyfW1KrySivSkQx9NauVU+uMR90BZBqB0agc3nlDntnfMAG VMZtKyLpyNhAUzCRE/LMDX4QrXQdUMw= ARC-Authentication-Results: i=2; imf03.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b=cZ5MLuGo; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=ccA0Qteo; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf03.hostedemail.com: domain of jane.chu@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=jane.chu@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com Received: from pps.filterd (m0246617.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49BJQeki007065; Fri, 11 Oct 2024 20:15:10 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s= corp-2023-11-20; bh=SHDAJP0o99fdmlCJH34NCzlIn93zbtykzhZj34fjpJ8=; b= cZ5MLuGoxNRu70Nv5ZSZ00XIGeLCn8tL0oCFpSJJiMXIJd9VY67edNZW4hMuCIn3 JfZDWrIkEJG5meXEagheleTOjzB4PHXmTtK34kAGZ6+ANFla4Bv/M+0CeahcxLd2 TV9Bkc76EKDkXm+12ee+5UBo0HNcUR1sPHJQR+9v4MD3S/1jd89PbEyCtoywCg2n 8IArgmhBzk3ZmiKU6WS5vydPwQpMrHCRafoXMh4OsA4KSghQBBALH+Ue1Oo1+GKI c7SrIjBLFEo9Rd7SSNSAEZ99OlhpWDQMYSWEVtU+LmcQlmkwlVzTDMteova9OeDl 8zcFPKfFSFiHTst5JGNPqA== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 42303ynra9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 11 Oct 2024 20:15:10 +0000 (GMT) Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 49BIC3sL005738; Fri, 11 Oct 2024 20:15:09 GMT Received: from nam04-dm6-obe.outbound.protection.outlook.com (mail-dm6nam04lp2048.outbound.protection.outlook.com [104.47.73.48]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 422uwbqd2g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 11 Oct 2024 20:15:09 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=jnVDu22SEMwyj3J6L4BYph79VPqUd7sm59dQ2IivsNRYnGCAlaria+nTIm+B4OUwWltQqVnQOnmJfr2v6+RrQfEFsY7Iiu77p845wQVVAgguAbrXPHuctnvTA7RfSHThZynjfXdPNbFhdFYqvxmiew2knSPFkw1YOF9QoXgXn2SiOqB1PKh07OR3hz8WIwmtynxHGp2tlwdoyfjBi8kkmGBaYLtyjA7JyA5L8s0ya3F49tuwj4W/IUCUqIdnHa+xDOIsTm2qSWAdCVeePMJEa3hTM4by+6VuO7M9E03LWTQh/ahxS4hvmBR4LnvaJi4+WvRoPUc+uQvxOTuHC5TrkQ== 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=SHDAJP0o99fdmlCJH34NCzlIn93zbtykzhZj34fjpJ8=; b=OG5lmy8wnF+3La/p+Aq+IhQT4y62fYNTc2UUHyEyCAGWr1RFWgmdl39paBkLxHpqsWLAXuRmY+7imTArgBT3+WR+G2bkT9bD2JZZmMKR30F/ZqOkfIW8mKe0KvoICgedQSGR6t6wulvysZ0cTN5BbpiEn2AJKFx7GrwApQXCZCmNIFnn1I4L6PSg89PopDU2cbtEbV8rBKKo6Qg4pGsCZxNZMKovCMLUY7yBEs0POlQu0Nf9L0AtOHy/IzS5COJAEGTWE9s/IQFlM8HxwAo9zdwF1u6br/Wqoi0djT9WENk88UCyPHcLQC3xUs3OY3QN5IFrvluVrxwRjGrCn3wC5A== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=SHDAJP0o99fdmlCJH34NCzlIn93zbtykzhZj34fjpJ8=; b=ccA0QteoBJ3DZKyDA4V0zEvmveaPlZW/Nv1rnRov0P+I9jHGdZLaaTfyyniFjtAj3f/p125Zkw4GP9zA35meV7nIrrmX259gmSo5xBg2q2d90vfN5FKSlPtiEdVplS5Jl4yHwVQh+u9s4U7OP+NC4p6vcdtw+UsCwk91ewmXQyg= Received: from SA2PR10MB4780.namprd10.prod.outlook.com (2603:10b6:806:118::5) by DS0PR10MB7901.namprd10.prod.outlook.com (2603:10b6:8:1a8::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8048.18; Fri, 11 Oct 2024 20:15:06 +0000 Received: from SA2PR10MB4780.namprd10.prod.outlook.com ([fe80::b66:5132:4bd6:3acb]) by SA2PR10MB4780.namprd10.prod.outlook.com ([fe80::b66:5132:4bd6:3acb%7]) with mapi id 15.20.8048.013; Fri, 11 Oct 2024 20:15:06 +0000 Message-ID: Date: Fri, 11 Oct 2024 13:15:04 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v1 1/2] mm/memory-failure: introduce global MFR policy To: "Luck, Tony" , Jiaqi Yan Cc: "nao.horiguchi@gmail.com" , "linmiaohe@huawei.com" , "wangkefeng.wang@huawei.com" , "akpm@linux-foundation.org" , "osalvador@suse.de" , "rientjes@google.com" , "duenwen@google.com" , "jthoughton@google.com" , "jgg@nvidia.com" , "ankita@nvidia.com" , "peterx@redhat.com" , "linux-mm@kvack.org" References: <20240924043924.3562257-1-jiaqiyan@google.com> <20240924043924.3562257-2-jiaqiyan@google.com> <7658ca1f-1b3b-4352-93d9-66f8dfd28408@oracle.com> Content-Language: en-US From: jane.chu@oracle.com In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SJ0PR05CA0013.namprd05.prod.outlook.com (2603:10b6:a03:33b::18) To SA2PR10MB4780.namprd10.prod.outlook.com (2603:10b6:806:118::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PR10MB4780:EE_|DS0PR10MB7901:EE_ X-MS-Office365-Filtering-Correlation-Id: 18a7c06b-02b3-42e4-9f30-08dcea31660a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?a0FOTUJXSndSbjNuWU9YWU0xYTNoOENqSGhYTDRSL0hSdFpNa1EwTWpNd3Vi?= =?utf-8?B?aHpKUDR6b1RoWnM4RitSN3hIQUZZdzkyS1c3eHk0ZTZGK1ZzTms0Y0cvMGJM?= =?utf-8?B?ZDBNTVBLaEFqWFBWN0dNOFpUbGsvUXQwdEVPb2o4VHFGOUp3RlY3d0JjQVZm?= =?utf-8?B?cFJaZ05lT3UxQi90R3BDZFBnSldwYklrcytzSTRYdTZZVjBRbGxwSlR2elFO?= =?utf-8?B?QVFLZTFyQ0ZzbCtvZjAwKzBCUFBMOGJrL2lIdnpYS2hqU0RPQXB4TUNnOWJj?= =?utf-8?B?N0N5UU5DUlJEUnR4bEllQ1hDOUVmS05ZWmdxWkFKbnVQU3kzU1dkUkZsL0Fp?= =?utf-8?B?M2MxZkJ6YU04bEZRbU44Q1E2Y2VwZFpTVy9GK3ovdEY2ZGFYK0pnZkNOeUMx?= =?utf-8?B?cktmdkpUQlNoUVAzbGVrbnU3Z0lid2tDemZYUVY5ZHNYVGhVU2QrelcwMXN5?= =?utf-8?B?SytsOGJTdk9wUSswbXJ5RHBjYlpGS0dMdllHdzEvN1h2QmlpN0xzSi9RTlVt?= =?utf-8?B?NVljci9tWDZNTnFZSkllMVFEMkhtMTNwVzF6NTdtRmwxNWhJZmkzSEtLalli?= =?utf-8?B?bStXMk1mUkNlY3BGbGhPK1NyRnpRVGdyUVlxcHdKZ2JQeUQ5Tlh1RVZyWVdw?= =?utf-8?B?bnJlVG1lN3hpRlowZ0FvQTFsSWpYM2R6emU5VTFjSDkwbG9RYnRTL1NKSlB2?= =?utf-8?B?OUxuSlJlUEtqSzBZV3BidjRzVE0vQnFQbTF6ekxtci8vczg2YXV1bkRJYU80?= =?utf-8?B?cGdhb1BJTjhERWhBVFR1eVdMMU8vRkppbnpERHZ3WGt3dTlLSzhTMTJRUzJm?= =?utf-8?B?NEZ1dGs5TWNUU0Z1bnU5MnFJYmljUHIvVUlGMldqRHhGWXgrZUlCYkFiS3Za?= =?utf-8?B?V2ticHpDM0pVN0txTUNxcVowajY5Vk1PM3lkNC9YZDRYeEFIMm9kTWxIOG16?= =?utf-8?B?N2d2dHZRUVBoK3oraFQ3cFBwYWxUcVR4dVJzQ0xTZ0JzOUt1R2tFVjZtKzJs?= =?utf-8?B?UWFvVC9KZGh6RTBxakhIaW1mcmVGSGhnUEhZcDdScE85NHk3eGZCaHNSK1ZP?= =?utf-8?B?ZmExaithamdKak82SWRFaFA2Yi9QWTVqRVJrTEZNMER4SFVjaXVXWjI5WCtp?= =?utf-8?B?M2RIQ2YxbGNJR0Y5OVhPZG9DeGdmTXFkQVlkWnU1d1AxaDJMYjl6MXlsK0d6?= =?utf-8?B?VWNadjBxRmZodHhPVnhTS3lQVGZiZHEyMFAvSHAvcXdlcDJzdENFS3FTVThL?= =?utf-8?B?UjBWSkJpVlgxVTZQbnhQZnBRdkQ5eWlPZXoyTVFJelhnVDJ4L0gzZVNtUEtn?= =?utf-8?B?bHhlSzh4b05ZZXpoaGEwQzFwRnQrKzhzZzdsM2FTOUIxclFpMXlweU8xeUw5?= =?utf-8?B?M1lrd2EwME1Xai9nMnJBZytOS1ZFbE5Kb3BoRVFtaGVJQ004ejNQdytnR3c2?= =?utf-8?B?OTFUSjRuVjExbnh5SjdTRk94cERlcEV3ZGdyYzRhRDNJQ3JwSmV5RElyb3BC?= =?utf-8?B?RTBiNHU1L0phanhtbTh4QnQ4MEFSc2FZSUZKeGlma0ZMRkZZUHozNVZuenZi?= =?utf-8?B?TXNGamZPU2QvM3ZTYlpueVJkVnU5Nm9BQ09rYTJkWFptMHlFVC9QNVZneWtn?= =?utf-8?B?akJrSzlsV0VoeGlUdXZqd3NXMDBVZG9kWHdtUnpSajFDeGtQWUVQUFVaaVZJ?= =?utf-8?B?S3IxQ3l0Tzlib0EyVnpWQ2ZlbzNnWVA0cm1FUDJoUW4xdkNqbjVJdDNBPT0=?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SA2PR10MB4780.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(7416014)(1800799024);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?ankrbHlLUDFuRXVYZ3RHVzQ1dWJjb3lacHN2Z3JFNE9reDdWQUhSY1N5KzQw?= =?utf-8?B?NkVxcU5WaFhxUmlEQ2wrVENjODBnajRIS2dDZ21pOWVubDJpWkJHTXlsVDJr?= =?utf-8?B?NGE1MkNOcDBDUXBjQ1dMcWtVN2lYSnBzR3dET3hCZDhraC8zb3pnMW1PdUIv?= =?utf-8?B?Y3VhWDZncTRmWS9FVStndjZpdjJTSDNZSDZZditYbTdKTmNtSjRpZHVqa1h2?= =?utf-8?B?a2JCK3BXTkxuVHRycmdaRVV5VHJmeEdRQk1HeCtuTzlyS25KbTBodEl6RlBZ?= =?utf-8?B?VjhNWVhPcE5HRGRVL0U1bjA3QVVDUnhkTVlYdDRVc2NFN0FRdkxaVDVkbWor?= =?utf-8?B?cC9peEJ1b3FHVFM0YkFaKzBoTENlSlVrUXI2MmpHc1pxdUxTSTJUQ1d5UTVR?= =?utf-8?B?RzZ1aXdTbkEwUDZ5ZXZOcHZXcTVHeWZtNllveDdxd2w1ZFhFYjZQZU9kYTRB?= =?utf-8?B?T1hjSHh3K2pUeXVKNm1DUU0zRU03SFcwTE0yNG5lR1pqNVRENk13Nnd1WmNz?= =?utf-8?B?b3lJK2FrZTIwU3ZmRzlCNGc1cStBd0hpcDh6RGMxWWpOa2lieVBNTEY5MWky?= =?utf-8?B?YldnaGdZbk03ZFNnbUxQQ3NxdXRLRTZHQ2IzSDZIMlh4cUdNMm1SQkZkc01T?= =?utf-8?B?RlB5QkF1RWJ2ZDN3dFpuL1ZOVU9oWUFtc01wcnluYzBCNDNhRUQ3aFhUWG1O?= =?utf-8?B?RDU0MzhOZzhvTjNKSkZhZmt0WkRLdCtNUnBEbW5XdzIxbFdEYXMvbzlQN01m?= =?utf-8?B?UWR5bU9PRjA3ck04VXJKQ2ljSHFpTkxZRk9OakZoUUVDVHgwN3haQ3llVUU2?= =?utf-8?B?THlWaHNkOFFVVlE1NnVEckwwNkNiVzJhNTVMV29hSXVXeHFYbHVCdlVyTXhr?= =?utf-8?B?b3Rld1IrUkhHUDQwbEpESjB1dkoveEh0cDdWb0g1SmVtdnVLMlQ3bFFWb05k?= =?utf-8?B?ODNBTTJRNytSakxzTmlURDg4R1ZWVnpBaTQxY1hjNTBSVEJPUUUvVThvdDZE?= =?utf-8?B?LzNVWS9HTXIwYk9IQWhkRGFMNWhLNWJXaU9JVW0vWWgxTnFTUlBGUEI0eDdO?= =?utf-8?B?ZXJPSUZyRlI4d1pRQk1NbWQwNkg0UEdDWHQ3STlaUnBlcG91Z05HUlhnYVdm?= =?utf-8?B?MXA2eDBkN1B6eHB0MVVrZ0RiZ2pSMnpjWUdJVEgyTUpYRnE4Y2I0eitydVdt?= =?utf-8?B?T3Q2bWd0enRUWC9MbmhVdFdoMWRGNVJBNkpsMFZFaW1sTWNNbEhBdlhGRXQ3?= =?utf-8?B?V0NnQzFLdnFndW9YRkp0K0dqTVk3WjJpK3Yxc3BwZUJLWkZXbytlcU9Iajlt?= =?utf-8?B?K1JEbVhkdmQzWVloQkMydFpBM0FqVVl2S3NycFVsVWtrbDloVG9QWStNemlz?= =?utf-8?B?RFJyNFlHTFRNS2g4S1BwL0QwNlZOODRwYk1kVW1adTkzazMrWC95ZzJVaVNt?= =?utf-8?B?YmlNcW1HMGhvMUc3NVNZWFczRDB3ZmEyanBpL25MUk53QTJIQlNSRWxESkNu?= =?utf-8?B?YUJiaFVMN2I1SHJvSm0vZGZ1Ukl2QnJyQkR2R3JBTXlOR0RXTTAzdkhGNGFI?= =?utf-8?B?ZTM1cFBMWXhrY3FTbHZya2IrS3orcHlHelJOdTdnQ3VPOE13YXNaOFNFQk51?= =?utf-8?B?b0tuZUJPVmJvQytESW5ReFZ1SzNmSXZnUmVGZjlZcm8xaHlJVE0xQU1tMlMw?= =?utf-8?B?dkRJK2ZTUWh3K1pxYXJzV0FycWlFY1hsNGZwS2NUYTZEdjJIc0ppb25jSTR3?= =?utf-8?B?YkdOQThNdlhFZnh1UWtxS2V3eXdsd2tIeXpiWnhRM1EvcUhqajBiRkRMRGhh?= =?utf-8?B?aW41UDBnNTlmNjJNczMxVDdlWGhJU1dNbDc0Vm9DN2N3NGQ0a1EyYlQ1R1RW?= =?utf-8?B?WXJxOHRPTHQ0R1RUeHZTWkhkd0lWTzBmQmJmOHNQY3EraTdDRTQzcFBvRUtU?= =?utf-8?B?c0FxUmM2bFV3Z1c4ZGZXMk93dk9MeVNQekFHcEdzYng0WFBibnlaYzNCeWxG?= =?utf-8?B?VklDQUJRVEhzRTJmU0VFbWwwKzJwMGw5aTNhNWkvS2FxUEtoOVpkN2gwOVVZ?= =?utf-8?B?dDFZMmY1dmM3dWNmUndNamxiM1VsTjlaODQ3RWdaUTlLNlYxMlQzOUFzYlVV?= =?utf-8?Q?SBR+AqEOD96BNrXhRgUq5fDHu?= X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 18a7c06b-02b3-42e4-9f30-08dcea31660a X-MS-Exchange-CrossTenant-AuthSource: SA2PR10MB4780.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Oct 2024 20:15:06.7907 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: M/mskrXCTBkd4wU7VjkRNHkVs+wUJPY6p/1iGwXNgC/nZS7IvTSazY2XSYJmbbB41cjHn5/WuMW4eilyw7T1rg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR10MB7901 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-11_17,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 malwarescore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 adultscore=0 phishscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2410110141 X-Proofpoint-ORIG-GUID: 7fsjBfbxc4GgUuilTI-0tgv7xL41xuuf X-Proofpoint-GUID: 7fsjBfbxc4GgUuilTI-0tgv7xL41xuuf X-Stat-Signature: 4c4aw68xctprs8murzt8m6y7zzf4a36b X-Rspamd-Queue-Id: 01A1120005 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1728677716-926448 X-HE-Meta: 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 qqKaxBdi 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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 10/11/2024 12:44 PM, Luck, Tony wrote: >> Something like by way of userfaultfd,  kernel provides a new/clean >> hugetlb page, copied over good data from the clean subpages and then >> present the clean hugetlb page to user process with indication that >> subpage x is a substitute of the poisoned old subpage x, hence its data >> might need a refill?  I am not sure how exactly to pull this through as >> the even is not a page-fault, but just wondering whether something like >> this is possible. > This requires serious levels of sophistication from the application. > If some thread still accesses the "lost" data, there's no signal that > anything went wrong. It just reads whatever data the kernel filled the > poisoned area with. For some applications there might be some > data pattern that would help track this down. But no general answer. Is it possible to rely on mf_mutex to hold off subsequent threads accessing the poisoned spot until the 1st poison event has been handled and page replaced by joint effort of the application and kernel?  I mean until the poisoned page is removed from the page table, other threads accessing it would hit MCE, right? > > On the plus side, the amount of "lost" data need not be a page. > On Intel the poison unit is a cache line (64 bytes). So more of the > original data can potentially be preserved. This might be useful > for applications using regular pages as well as those using huge pages. That requires the kernel to provide finer grained SIGBUS payload such as untrimmed vaddr and si_lsb=6. > > When Linux first implemented recovery, we had hopes that applications > like databases would be able to implement their own recovery. Losing > a whole page turned out to be problematic as in some implementations > the metadata for a database entry was stored at the start of the memory > block. So the SIGBUS would provide the virtual address, and it wasn't > of any practical use to determine which data structure(s) were affected > without some massive restructure of the code to separate metadata > from data. > > -Tony -jane