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 4F506C48BF6 for ; Thu, 7 Mar 2024 13:50:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C3F0A6B0187; Thu, 7 Mar 2024 08:50:23 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BF0B26B0189; Thu, 7 Mar 2024 08:50:23 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A425E6B018A; Thu, 7 Mar 2024 08:50:23 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 915DF6B0187 for ; Thu, 7 Mar 2024 08:50:23 -0500 (EST) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 6C09D1A1011 for ; Thu, 7 Mar 2024 13:50:23 +0000 (UTC) X-FDA: 81870377526.01.97C62F5 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) by imf12.hostedemail.com (Postfix) with ESMTP id A19844001F for ; Thu, 7 Mar 2024 13:50:19 +0000 (UTC) Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=YyyzFQ87; spf=pass (imf12.hostedemail.com: domain of fengwei.yin@intel.com designates 198.175.65.11 as permitted sender) smtp.mailfrom=fengwei.yin@intel.com; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1709819420; 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=588hCfKRCFVM4EacAx+zot5CPsCg+SzxuBxKXHuF5J8=; b=czwrwZgP7klSlrpvokquiWkIRX0cfNV378V6tyJEckCw7ZaGYGSRUFLWGlPv8zbXf8T5AU xFpiRfGgsPuDW+tQLPIRksRPyZX2Eam3R4HGFoNDm2VNdBYHVWdpf76Qxn1GWTo3sJmH+O UusKIDP00fX0vBbOLvvlEPDz/YNvw5c= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1709819420; a=rsa-sha256; cv=fail; b=rgY7v6ygL9co+nM28tBynVK1TvSxi9mO7Jz96ezybuGh9qnnyblwuAbXm+Js5K20gWPtUj /ydrpm4vzSP65PaGsXZWqZPNbwod68S9WFTnmYavdIxmYGr5w1i9ZARW5JO7ipkHDGrG7D By45sonT8HG11DptZakcY8LxIwQ7EGM= ARC-Authentication-Results: i=2; imf12.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=YyyzFQ87; spf=pass (imf12.hostedemail.com: domain of fengwei.yin@intel.com designates 198.175.65.11 as permitted sender) smtp.mailfrom=fengwei.yin@intel.com; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}") DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1709819420; x=1741355420; h=message-id:date:subject:to:cc:references:from: in-reply-to:content-transfer-encoding:mime-version; bh=od8Hav80p1J6jQa0J60dX8KptrGtsxy7S3ye7IzM6Fo=; b=YyyzFQ875lESd+AsOaH3i0MMKjlTSyVNT9xkeMQ1omd5p8zYY8OBvm0p ZE/6oXkhHWfLGfsPyJ/xTJc5GUUDJpXNOgdQSENnSMNtbExnglIIwcqJS KGtUtrSBeiZc3sic1vDULm9jlQ1C48vPY10NSslEo+xMQ+Zd8vfWuQiox wQfpxE433bs2pY2uGus608j9InQP+c1yvAYiWPxkN6b3PriIYNTwFv6B5 VF2AwOSALCjBukByXSQDPwVoT/iPy3066wL8B64Fr/FmwOuGIz+iKOaGd M0uuyR3D85eQ+UllKe/gb7nTzvzhJxsKeQXHpesHlJh85PZhgm6zv4vRg Q==; X-IronPort-AV: E=McAfee;i="6600,9927,11005"; a="15057478" X-IronPort-AV: E=Sophos;i="6.07,211,1708416000"; d="scan'208";a="15057478" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Mar 2024 05:50:18 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,211,1708416000"; d="scan'208";a="41007681" Received: from fmsmsx601.amr.corp.intel.com ([10.18.126.81]) by orviesa002.jf.intel.com with ESMTP/TLS/AES256-GCM-SHA384; 07 Mar 2024 05:50:18 -0800 Received: from fmsmsx611.amr.corp.intel.com (10.18.126.91) by fmsmsx601.amr.corp.intel.com (10.18.126.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Thu, 7 Mar 2024 05:50:17 -0800 Received: from fmsmsx610.amr.corp.intel.com (10.18.126.90) by fmsmsx611.amr.corp.intel.com (10.18.126.91) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Thu, 7 Mar 2024 05:50:17 -0800 Received: from fmsedg601.ED.cps.intel.com (10.1.192.135) by fmsmsx610.amr.corp.intel.com (10.18.126.90) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35 via Frontend Transport; Thu, 7 Mar 2024 05:50:17 -0800 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (104.47.57.168) by edgegateway.intel.com (192.55.55.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Thu, 7 Mar 2024 05:50:16 -0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=e0hpW7zR/z9HdDmxrwLPZdR06riScR05i+IjI7RxKTkArXculR9PL4Ap+Ljxeu+w5M84rFy+G7QWiJnXs5NrMd51MO0EPJqx9FgPkS2reHgzAmIKl4NqP541xds8fe44fPVd28LBUOlY4GMjm1fGibj/nRrT/g+Shjg1th964cICYkGFm+QOkTJ1tyT1JUxfiV6Bpu77oiJaqlJVxwqxdVfO+cc0HTnOQXOXgDxLJ83S4Sez5drtKgVBtZdJwMLVjAu6B10zd8LumZlI7+BCPJ28Tn99maAGnmr3SurIYMWwcJn3wc2HFiy7R/BXTUJbED10C3DQHySx8eko6cQF+A== 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=588hCfKRCFVM4EacAx+zot5CPsCg+SzxuBxKXHuF5J8=; b=dQDHmDUBZ9va8NNG6jREw8j+CTtPykR0fg10Gh9J9EfCBPZr5PLsbOm5Yd2A1eBYX9IWJnTkpGiO4AGasPcnXSC/2KzQlqIlTOnTgkqW99S/3Nv9Dob0r5x3/AmIldHKUYyYSRHK+1D3T3WhyVQIvvSTKKeZA10EY6ibubStIt35ApqzF+nnZ/U4cIx9GfZSJkKMHsUZPsJQnGRp5QT8VQ2A43T9xfWEGi+TCwv1bSG5Ed9RIvRQr3xP4JtvZ4V1sVmccOz4EKp2L/+3c7VP78Mjv0mXyuSje+HEf9fB131ILCfkby9OytNtKo4VzviWh5CzHK6bnb+oJplb2N9Lxg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Received: from CO1PR11MB4820.namprd11.prod.outlook.com (2603:10b6:303:6f::8) by CY8PR11MB7828.namprd11.prod.outlook.com (2603:10b6:930:78::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7386.6; Thu, 7 Mar 2024 13:50:15 +0000 Received: from CO1PR11MB4820.namprd11.prod.outlook.com ([fe80::65ce:9835:2c02:b61b]) by CO1PR11MB4820.namprd11.prod.outlook.com ([fe80::65ce:9835:2c02:b61b%7]) with mapi id 15.20.7386.006; Thu, 7 Mar 2024 13:50:15 +0000 Message-ID: <0f5bdbf3-725b-49c7-ba66-973b7cfc93be@intel.com> Date: Thu, 7 Mar 2024 21:50:09 +0800 User-Agent: Mozilla Thunderbird Subject: Re: Content-Language: en-US To: Ryan Roberts , Matthew Wilcox , Zi Yan CC: Andrew Morton , , Yang Shi , Huang Ying References: <20240227174254.710559-1-willy@infradead.org> <20240227174254.710559-11-willy@infradead.org> <367a14f7-340e-4b29-90ae-bc3fcefdd5f4@arm.com> <85cc26ed-6386-4d6b-b680-1e5fba07843f@arm.com> <36bdda72-2731-440e-ad15-39b845401f50@arm.com> <03CE3A00-917C-48CC-8E1C-6A98713C817C@nvidia.com> From: "Yin, Fengwei" In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SG2PR04CA0215.apcprd04.prod.outlook.com (2603:1096:4:187::14) To CO1PR11MB4820.namprd11.prod.outlook.com (2603:10b6:303:6f::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PR11MB4820:EE_|CY8PR11MB7828:EE_ X-MS-Office365-Filtering-Correlation-Id: 85e3f18d-6342-442d-8b43-08dc3ead844a X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CO1PR11MB4820.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(376005);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?b1dBZTZaUEljeEFXZ0VtZjZ3c0Y2blZOMGRvMlFCTVRTbHkrM2hxdWlvdWsw?= =?utf-8?B?SFZVVmhPTDNHbWl6WGF2Vm9rdFA3YWxFRGh6MjczdzhyNmhpNWk0MU1wb2l2?= =?utf-8?B?QXVpQkdReDFjbFF0SFIrTVJ6blRodHFudGZjbmZuSnU5Uk1TY05NTTBPTFRi?= =?utf-8?B?NFdta2lYME4zcnMrTUo4WkNvVXZZWXlBcldxVUc0R1BpeWVmSEVrejBGdzFU?= =?utf-8?B?cytVQkxsSGEwN29nU0pxem1pZE9vSG9hbk5hNHQ3dXl4cXI4TFlnOG1TN1ln?= =?utf-8?B?bzJYdHFhK285ZDNIUHhYQ3FadGlLSkg5VVo4ZDBqSnVZV0VBWTdxdit0QU5h?= =?utf-8?B?YUhMcTV6aG1SYnVvSzBtckFYZHJPQ3lYc0FyNmFjcU9vOWx6c2NHbHptaUMv?= =?utf-8?B?QjE2Q2FzL2ZJdW9Wb2FuQlBWcktEUGlmVFpvTWtyb0hvWHdSMkVkcGhsZUty?= =?utf-8?B?MkpBaDl1eSttbXM5V1lLWi82RVpkQ3V1VFJ3TUlkZDJIeTZaTmlqb2FBeWFo?= =?utf-8?B?ZWV1VlVVRTZNUjNCdUovQUNjTk94OHVMeTJzZ1JBMm1BcDRoMVd5QldLaHU5?= =?utf-8?B?TTV4UkdaV0FIQnRNckVwalg5VkhUUlk4d2VaTFNTRWRJWHIwOE9vVjYrenhx?= =?utf-8?B?NW80MGl3cDJKYjVIcEtMMDlBS3B2b2lxNVVYVUsyazB2NFl0UkpDd0YyS2pl?= =?utf-8?B?VjRoM3pBdUs2WEJYbk03WENCOVUyUTdubXFnWnZYUUVsVnNDd0swLzhQRkp0?= =?utf-8?B?QmNURHQ4UnFzWE4xZlZuQnhmbVFPSUlXU0tyZ3U5RTN6dndjS2hjM3JGdCts?= =?utf-8?B?bnRDRndWSXl3MTJPVDNrSVo3Vk4rWWh1RUxNdWZDOHo2aGczT3VTcllQUVlX?= =?utf-8?B?eUtSNWhUR0JnMGkySnF0enppdEprbVk2NE1yTER6bGtXVExDOHI1WHpPYUJY?= =?utf-8?B?N3ZkeDFrK0ZoSGtFY1Y3S0FBSTBkd3FBU3pQL3Vld2J0RFlxZy8xZUIxRnI3?= =?utf-8?B?VzdQNHozZnRIUGlGLzZaU0RRUkxyZVRPNEVXYVlsQ2ZaR0syVXM1dTR5SWh3?= =?utf-8?B?WDg0eDl4MkJUei9BMllESDBPeHI1K2lFd3M1Y1BMWW1DTGdldXlGYi80bEN1?= =?utf-8?B?VUtOeFV2UlJmUVpHOEZobWxJRCs5U0FUdEZCbVBKV0wwdWtTOFladitXeERY?= =?utf-8?B?bDZVQm1Ia0lOZlArRWN4TDNVQWt6bXRiQTIvcm9MQXBmd29ncjNtd0htK3ZJ?= =?utf-8?B?ZEN5OUdwVmozNk9vcWRPNHhMOTZzSFB5b3ZtUVY5ZWJVVXF0VTlLcllNeVF1?= =?utf-8?B?czNWeVg3UmdHbytyUTg5czEyVzJCVlh4eWJqVTUvei9OWDlDNlhobDZ0bGJY?= =?utf-8?B?OEZic0huZFcyZEV0OFRtZ1NBZGdOanBiSUlhM2o4UnlZWHNoRk9DRlkyNUVZ?= =?utf-8?B?bi9xRmlPam5aMkNJS3dDSmduOUJ3Uy84QXFqM3BkSDlLcEtnTlRvM2ExRCtj?= =?utf-8?B?R2JoUktLNDlKN1dyek9aUVoxZUgySklMQTRHcFJkekZ0dVorNldIU004MFNk?= =?utf-8?B?enp5OTdmeTA1WitWbnNKRGtmemJ3M00rc3FCOFhlbnRHckF5UEZrbWN5UllM?= =?utf-8?B?N0tTUmVubkF5ZUp5MGhIamtpUnlUMnJTRGlEaDhUYlJ2T0tQZnhpYVAwMUtM?= =?utf-8?B?Y2ZLS3RlT3NMaW1ZNkZheVRCWVlJMGRrS3VpNWhOM2QxekI1Zk5oVzVEaUl4?= =?utf-8?B?d0J6T2RvQUJoVWg3V29HS3FJbDFpUWhyZmI1WUcrRmtHcHN5cjNrYUdDN05K?= =?utf-8?B?UEdxM2F4ZVh3N2plWTJ0dnBCQU16ajR4UFFCQWEvQ3FuT3RIOVFGSStSWENR?= =?utf-8?B?V0Zsc2Q3MDhMOUlpTUVjSjhBOUNJVGZTbjVCK1Q1TkVxanIyRTRISzNHcGtP?= =?utf-8?B?U0VFUnBJQ0QzNHozT3M5OXk2Mm9CS28xc21JMUVQRFZDZ2tiVDVmcVFmQUFH?= =?utf-8?B?a1hUamJhV0RmdnFJb1NGNjBtYmE5Z1R4Q1RobGVYWXBDZE9VeGJJQll1VkU3?= =?utf-8?B?TVVNaVJXVE5qcTVVaVpHWWtsRndUODAwN1ZMWUQ2cTkzVTBLbWNOLzF4aVo2?= =?utf-8?Q?D2dPQcLcCr15vvKBXN2liyhEr?= X-MS-Exchange-CrossTenant-Network-Message-Id: 85e3f18d-6342-442d-8b43-08dc3ead844a X-MS-Exchange-CrossTenant-AuthSource: CO1PR11MB4820.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Mar 2024 13:50:15.2453 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: /TG3T2LL3gb0Fz/A2FS9F1v7U7hyBYOkqD5O9pS3JQWdEQBBBp2Vn3KJFh5NTmKbhzR0+ppKloCYK2UyYgLxCA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR11MB7828 X-OriginatorOrg: intel.com X-Rspamd-Queue-Id: A19844001F X-Rspam-User: X-Stat-Signature: 6h4b94wr6yf7o1oscx8wm9aee1z3ssgw X-Rspamd-Server: rspam03 X-HE-Tag: 1709819419-437186 X-HE-Meta: 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 pmOl4dJy m1lKgAb3J+jIOCCFEUQYQiKYsXsAStKezGzUUtA+Sxkt95Dx52L5TLHPmmUC87AS8CCG6nyapUGeMRQR7G9+IWhE0zA== 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 3/7/2024 4:56 PM, wrote: > I just want to make sure I've understood correctly: CPU1's folio_put() > is not the last reference, and it keeps iterating through the local > list. Then CPU2 does the final folio_put() which causes list_del_init() > to modify the local list concurrently with CPU1's iteration, so CPU1 > probably goes into the weeds? My understanding is this can not corrupt the folio->deferred_list as this folio was iterated already. But I did see other strange thing: [ 76.269942] page: refcount:0 mapcount:1 mapping:0000000000000000 index:0xffffbd0a0 pfn:0x2554a0 [ 76.270483] note: kcompactd0[62] exited with preempt_count 1 [ 76.271344] head: order:0 entire_mapcount:1 nr_pages_mapped:0 pincount:0 This large folio has order 0? Maybe folio->_flags_1 was screwed? In free_unref_folios(), there is code like following: if (order > 0 && folio_test_large_rmappable(folio)) folio_undo_large_rmappable(folio); But with destroy_large_folio(): if (folio_test_large_rmappable(folio)) folio_undo_large_rmappable(folio); Can it connect to the folio has zero refcount still in deferred list with Matthew's patch? Looks like folio order was cleared unexpected somewhere. Regards Yin, Fengwei