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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 91C46CCFA18 for ; Tue, 11 Nov 2025 05:26:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C173F8E000A; Tue, 11 Nov 2025 00:26:48 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BEF248E0002; Tue, 11 Nov 2025 00:26:48 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id ADE628E000A; Tue, 11 Nov 2025 00:26:48 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 9BE208E0002 for ; Tue, 11 Nov 2025 00:26:48 -0500 (EST) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 42B0C12CEDD for ; Tue, 11 Nov 2025 05:26:48 +0000 (UTC) X-FDA: 84097191696.23.8DB8181 Received: from CO1PR03CU002.outbound.protection.outlook.com (mail-westus2azon11010045.outbound.protection.outlook.com [52.101.46.45]) by imf23.hostedemail.com (Postfix) with ESMTP id 4803A14000B for ; Tue, 11 Nov 2025 05:26:45 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=XW7To1mm; spf=pass (imf23.hostedemail.com: domain of shivankg@amd.com designates 52.101.46.45 as permitted sender) smtp.mailfrom=shivankg@amd.com; dmarc=pass (policy=quarantine) header.from=amd.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=1762838805; 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=8neRj2Q7t1HNQ5sv7vGiQwQar4UrwBmrxFUIw485epE=; b=U4roQDyqMX1rAelJHTsjHl4pKvE/xJtdwo0iVjmOzUibOR0i5/fgPj9/mR7hsQieBpdZDZ k2uKBhh8/PUkt/sdry7iv27J3T+mPEeWxujF+VTuoOy0sZh4BfOQWQ0gFnu+/x69T9AA4W Px0tnWBTsOGv2VJDTw87ikgVU4zseU4= ARC-Authentication-Results: i=2; imf23.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=XW7To1mm; spf=pass (imf23.hostedemail.com: domain of shivankg@amd.com designates 52.101.46.45 as permitted sender) smtp.mailfrom=shivankg@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1762838805; a=rsa-sha256; cv=pass; b=yHhpUbSh2X/jylzHaa+7eUNv74htFNsqNx3eMKc7ToS/BwyP7sLl1Gq/IhL/AarIZytnTI 9byqvMwX1Fq47dwjzaGoaU4lAMEWOmEOjIm3ygLfTTxw/sSStwQbjlgUJYoyTzL6ldbO7L P/QUhcIO/thdpa08tCnphTMSIQAY3qE= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=zW0FqUMPGGvI3c9DQ24YzKlr086yaPsRCbceV5uOGwE0TUEosyWGoS//RkgxDNA5QyGvrIzVTjOuohKEh+GHrAFcaIugw/fNXgofQGI00iefPk7fuFEKQcCLGJKGQkdkxoiXIg0dziVnsLJ81LHeLoigiW4GNSVbWJ7/TFPuqUkSEe4y5NrijEaE5wP00SyGsiEYfTwiNjcryBWxBRYDPv4cHXCUvqV6xyS4Lrjhv4bhoe6JtHv3jUai69VY2x5H7EVQRfgsb66GSjR/b5I/Oebqht+QvzeABytwGDzQdojzwbnuxHyTtZc2ALj6oRzbtjGmzqPQ1A1VjtDBHvaW+w== 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=8neRj2Q7t1HNQ5sv7vGiQwQar4UrwBmrxFUIw485epE=; b=Tvr26sQEUszVIXgxYSfK4FqoBph578+bWd1x+6jGiT8Gb+xUI3OqGRugvXczGOl/ij0XEwXp+ASy5p0fSOA9dIEXwANcNU8Q3F/fIbhpXs30FdAm6pCQ46mRLJB5SGx87B7AIHZqFOEhYxH+7Dx04JCg3F+YopfLj9xsEgog3u7vAWtduAnq4EL0EJPHibYVYiBfwcpjrDTtZSBBlTGH+1O7m1XKuGhOwyNJaX7TRKWuorbedvn0AxeIbMdn+gGQUIXLIbUIWVnn1QKkA6+91d/JTb4PqYm4iORqw2WBXIhiKzLhcln0pTJvxkHiHqzZR2FNiB4f7Ua91D+0ap8ntg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=8neRj2Q7t1HNQ5sv7vGiQwQar4UrwBmrxFUIw485epE=; b=XW7To1mm90wgwx1UDYnv9K1Ncty5RexmaF2hk7b2cnKg0hdaLfxSOPWDyrWpgIupnsHjoJr/H5ltOk7L2gHjv5PYtGaBSLNezP9pe69u0N80PkBltuFTesSwiPjmnaCIBirHLlVxxT6Y+GQOCSThVRFrJRpyNV8wt259qYpm8Ck= Received: from SJ0PR12MB7458.namprd12.prod.outlook.com (2603:10b6:a03:48d::13) by CH2PR12MB4325.namprd12.prod.outlook.com (2603:10b6:610:a9::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9320.15; Tue, 11 Nov 2025 05:26:41 +0000 Received: from SJ0PR12MB7458.namprd12.prod.outlook.com ([fe80::83e7:e6cf:26ed:2f3d]) by SJ0PR12MB7458.namprd12.prod.outlook.com ([fe80::83e7:e6cf:26ed:2f3d%6]) with mapi id 15.20.9298.015; Tue, 11 Nov 2025 05:26:41 +0000 Message-ID: Date: Tue, 11 Nov 2025 10:56:31 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm/khugepaged: do synchronous writeback for MADV_COLLAPSE To: Lorenzo Stoakes Cc: Zi Yan , Andrew Morton , David Hildenbrand , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Zach O'Keefe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Branden Moore References: <20251110113254.77822-1-shivankg@amd.com> <3b10d11a-3c75-4c37-8810-e238113ce75d@amd.com> <69FF5A7F-1414-4DE5-8A2D-09ECE240711C@nvidia.com> <77925a0b-fa06-4200-a967-a66bd93201db@amd.com> <27920b64-240d-40f6-a02a-0a8c433ca9e1@lucifer.local> Content-Language: en-US From: "Garg, Shivank" In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: PN2PR01CA0189.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:e8::10) To SJ0PR12MB7458.namprd12.prod.outlook.com (2603:10b6:a03:48d::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ0PR12MB7458:EE_|CH2PR12MB4325:EE_ X-MS-Office365-Filtering-Correlation-Id: 66e06dc8-b5da-47e5-cc1a-08de20e2e4ad X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|366016|376014|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?enJNYUgvVUQ5djk3cld1OTd4bEhsQTYwa3RvMjBjSHA5dWxwL0tCVm9RQ21a?= =?utf-8?B?OElvNDllaTNuVlBRYW83Mm9Oa3cySVQ0RUtUWkkwbnlJY0xhUzJqcG5PQmc0?= =?utf-8?B?VUEzL1FxQnVhSW1BMFgxN1g4R2krM2I3Y0dMSkVGVXBCSmJiM0ozdGRFd1ZQ?= =?utf-8?B?VmZrbnI5VHdmWnowMVFkcks5dFFwclRmTFNkUHYvY0VObXJ6TktwR1NoWGx3?= =?utf-8?B?TU1wNHo3N3h2U0U2bWdyUlZFWklJNVg2OGdXcDdQNFVGc3Nid1grVnFEbitv?= =?utf-8?B?Skw2TWFXcm4wWlRlZGlZcGhUSTJBcThhM0lLWE1oMXJicXRHbzBSVUp1MnZM?= =?utf-8?B?cE9jMDVUdVl2a1lFaHE1WDFoYmFCdys2RnFvdklJZllaNVVacDEzby82L1ZU?= =?utf-8?B?Ukhhc1UvUzR1Q2xiRDlvWnlZb2pYcE91OG9udkFZYkRzRVh5eWl2enhFWGFw?= =?utf-8?B?N0NyUmZVSUo5emk0MCtxeEdjV1ZmWVA3Z1NMMXM2d0hwcC9ZMERUa1Z1NnhN?= =?utf-8?B?d3BXcVBDMkhhL2t3aWtGTnNQRWorSGxUeDhGYVEyZ0NFZHZ3Q3pLTXVWN3Vj?= =?utf-8?B?YXFrbFhXSEVySFRSdHQxMGhmeFRYZW1XRG9Vb01LVWNOakVoWjF6RXJlYmY5?= =?utf-8?B?SDQzcTB3czVYY25MUnllQWtURUtod2N6YjVtTmxCYjJjSm1SMnNTdVVncVho?= =?utf-8?B?Y0ZwSk9ad205b0grcTZTdWhRdm1IN3JnbEc0dGx6VUVDWnBwN1dNVGIxN3lG?= =?utf-8?B?WlBIZzJFRXpQcmVSbkw0Vnd4LzlpbGNrTGFaWU9JR1J4RHlLOTNKUVhabVpB?= =?utf-8?B?QUZDREYvRXBmWjdCbFVoYUtrTmhNdTk5NllqdWxVK0tuMXRnVGJtQU4wQ1BM?= =?utf-8?B?UXZGOCtyVVBNd0tqYStqZVZnOXRmRUo2TDlRYk5JbGlOWkFqMThuYjlRZXo3?= =?utf-8?B?RFpHQWFqK1lyOS9VYVgyRC8vOHV5YjE4T2txZVVOdXJXVDVpdEJVcHBWZmcv?= =?utf-8?B?ZkE5TDhGc1pUU0tYRjhjRkJ2ZWx6andKT3lPSmtucUJIU0YvaFg1Zm4wdjNr?= =?utf-8?B?NytpUHVYeHFiM3lldEhNc0poUWRlM0t1RmNiMXE0QzUzNEFSY0ZNdWRQNXB6?= =?utf-8?B?ZDNOUmJwVDV2WjYydW9mK3lTdjdHcXU4TVJSc1FjdFM1dVJ3SWxKL2gvNTh6?= =?utf-8?B?SUF1bFphaG1nZ1JORUZ6dGVMZnV4d2ZqeTBxL3hpNnZXbkhJQjhvR3krdCtZ?= =?utf-8?B?TWkyNmxnT2hkMXNpWUdhQVdXeXpWTVpKV2xXdmQzWmNvZnN4aDVEY3Jwb0kv?= =?utf-8?B?QklKMW1OZElyaHorMFhXVytVWjJtSk8rajFkaUZreWQxQXFRdHYvSWg0MGdy?= =?utf-8?B?T2w0S0ZYMVZwcUNMeitmckh4Y1B6amxNdHQ4bmNMZW1xQnlxNG04REVUSzFV?= =?utf-8?B?cTBZcGFNSFo1UFRLQm9BVENOS2hiaDhVNFlSdFFQaU51U3lMSXJTV1Q5b1Iv?= =?utf-8?B?RmJkUEFscUIrVkhieDFmeFJKbVd1T0dNQnZMeGVONGl2cUVmOW0xK0dCZHpm?= =?utf-8?B?bEtVZVBYMEgwNkpiT3pNWlVDd3puYUNrSy8wZllQQlpLajR6TlhIS085NXUv?= =?utf-8?B?ZFh6a3JUZE1rUnpITFZ3cVJ4V0NJaFNJSEo2bHVFU0xTUjV6UElaNGZDRDBi?= =?utf-8?B?MUNFUlNoZnpZL1hxK1d2MjkzT1FieE1oMHhvblBkbHhOVWw3QjBpWTFwUlli?= =?utf-8?B?QUQzSlMwSW1rYUM3Y1ZPV2NqUGtRclR5MElWQ25TM2RSQ1NtQ3laNmRhU3dh?= =?utf-8?B?SFE0SktTRkRBem5DZ2tJa1NNTlNrUDB2MlQ1NEpTbXlOam44ZzZJU0J6WmJQ?= =?utf-8?B?aWMwR3VjdDRxczZqeVRnWFZWKzQ4TlhiSlFsQ242WDhCRHQ0Z2tjS2VkSEw3?= =?utf-8?Q?JOTAdaSAnJG1JCMgvOEUUyF07jdoWjVr?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SJ0PR12MB7458.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(7416014)(366016)(376014)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?eGRRTXN1RUo3WGJQQkI0L3VldlB5d1FLWU5VTkQrL2d6K3Z3NnNhV3dPN2dv?= =?utf-8?B?MW5TZTduRGlEUzVaSnlDSlY3OWxFVHpjL1NTUkVEWHA0dWYzcEYxSloyWVJr?= =?utf-8?B?UTZOZnBGbms1V0g4OFRMMWZqbmlDcFIxZ2ZFWnByUitWWWdJYWtHNCtxZlpx?= =?utf-8?B?Q3ZwaHA5NXAwaGZZWkVGb3RrbFhFZnYvZHBURDMwaFRsdkxyNGttc3Z5KzRN?= =?utf-8?B?aEY1S3FWazhCeVRabmJvREZadEZGeHliWStUQ1IzM0YvYjhyeHBsb1owQTQy?= =?utf-8?B?LzhneWx5VXV3c1hjcU1DN0tGcG4vUkZyY2llVmhuM1NCSHRJd1pXaXBBakdP?= =?utf-8?B?YmpsWEJJREtKNE1NYU4zMkozN1VjZ0FvbU5od1UySFRSU3BkNy9JdWFIaGVm?= =?utf-8?B?bmxSTTBjTWxQQXZ3akR3d3ZDdmNMeW5tS3Jnd0lGSjRnamJxMVNFbDlubnJ0?= =?utf-8?B?V2NxRlJ5cE5WeGpxa2UzKzZXQkJHaGdCNkRRejZrRkNvdkx1WG1pbDlJMHUz?= =?utf-8?B?bkJrUCtWUURRMUE3SjFVNmtTTkJoSWhHQmJ0N21pWktPbXgraTdSUmdhU25S?= =?utf-8?B?NWdHY0JTSTR5SDZjVnFOeGkwRVh2V2pZaldxR0U5aWpPYXdUdi9ETlVPMzlM?= =?utf-8?B?SFBrWkRzN2NEZTNzNTVyVzZsd1hpSkVuS2hoaXhmRW9kdnlDaEs3Vk9ITVdo?= =?utf-8?B?QTg3Z004T0VmUU9QQUFyU21ZeFN0ZFNtZTI0TjR0L1ZneTdGei9YUzY0V1p5?= =?utf-8?B?cENzUmlqaExHRFFQdFNVN0RQdzkyU3VBSzRtS1dDNmNTcVY1OHM0UndkQ1Fi?= =?utf-8?B?UHFFNVJYZnMyNENzb2RFdGdyYjZFc0dodkprYUs0Smt1aUY0N1RRd0RNSTl6?= =?utf-8?B?SGx0aUpJKzhiUzJ5RGJ4VUxjMkkvbk1iSWt6OHBIdHZFOGliSnI0cjhoaDVJ?= =?utf-8?B?TGJTbGZJc0lmTWxnbDJ6LzVZcTJLUHptcUxTWG9DSXI4WlZuRzNTUDc3d3du?= =?utf-8?B?ek9vd2k0dDVyT2hRMCtKNFlCSHZoNDdCZEVRNjFYVFpnZ1RmeTVzTHdNdTk3?= =?utf-8?B?RHJVNWlVaERQWmt3NFhwbFAyS25rZUZwY1ZsdXcxRHdVcWp1SUlWWUJIdSt0?= =?utf-8?B?SkhJNFVTZldSbVFpVTlEU0QxZlVObUI0VlpXQ1hJMFdhdUlwbUFOcHZPQzQ2?= =?utf-8?B?ODRYYWdWWVhudEw5amZZK05VbTJCZ1RIaXo2K3dNdDB5ck5tclJXMkd3MUp5?= =?utf-8?B?Um9WRENmMVVGdlhISy85eTFrQUJQOTVEU0VlYU9BbkZ2ZHlmWllKODBxUzQ5?= =?utf-8?B?Y295dlFxc1dtSGRsKzV5cTlNOTllOUwvNFhsNWlBYXpHcDRZU0ltZkY3VDVN?= =?utf-8?B?ZDNtTXJvc1hzZEE1YzEvOTJPbG1BQUpYbUxFWGNmTUdjRmR4cUU5TmhWQU56?= =?utf-8?B?TFpuL09TWmh6N2MrbzYvV3NieDMzQ1grTDU5L0NHTW9pUE9BbHp2c3Iwb2h3?= =?utf-8?B?NGdLalRJNUhuem1GU0NtcmlKaGV4c2dwR2FadFdicmEvY2Y2bitIZlRScGht?= =?utf-8?B?YzFhWEpUTktsdFVWZ1RMWDBvSTEvWUNWVDFaUHdEc09hblArY3ZwZVhXazlD?= =?utf-8?B?MkwwRDNFM2M0dGMxV0dvNXI1ZFhHL3BaYkpHUHlBcnhXbnZaZncwZkpXaG95?= =?utf-8?B?Nmc4UHR5a01aRDh1Ykd1UUt0bTh0LzQ2cWtrNUJQWXJsVjVFRXdlT0U4dnI2?= =?utf-8?B?M2pHVWo5cmhBUXRQVEltOFEraEw2T0dGaXg2OE5zenpFMzlYc2JFdlZWMXpw?= =?utf-8?B?d2hFM0xXR3hxRHJ3OGpWMkw2dHhadktYM3piZjloV1gyS3lMWktsSS9EOWdP?= =?utf-8?B?cmNDUCtRZGZ5VjFhMGpMK2x3Z3BRYURiNHBaL3hpR0s4dnRDUmE5V1ZhVHl5?= =?utf-8?B?Q1hDb3lPMTMxSDFKRWxReUFya2k0aTYvQ1hLVFhvcFQrbXd1WVZQNmYyRmJK?= =?utf-8?B?TjJYeUhGY1dWd2l6aGEwQk5VSy9BS3hrY2JzbStmbnVYdlZJZDJlb0I2aWxS?= =?utf-8?B?aXhLaXpkNkxNNHpVQ3ZiUVk0Z1ByN2E5RmR1anZ6aDVPVi9MaFdvc3hSY3FO?= =?utf-8?Q?jz4FCX6uo7QcYAPuxHA9Y43ki?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 66e06dc8-b5da-47e5-cc1a-08de20e2e4ad X-MS-Exchange-CrossTenant-AuthSource: SJ0PR12MB7458.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Nov 2025 05:26:40.9471 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 5dpotn0KFdhdfNqMnCV57GmSwBsPZv34yIuRSstb/ehXsM08ms9rW8IXdM5JukMtGBWMXX0MVkcIKF+OA8k/jA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4325 X-Rspamd-Queue-Id: 4803A14000B X-Stat-Signature: 6axyeehzupgy5n8t888ktwcj71stiycn X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1762838805-618026 X-HE-Meta: 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 ZQsWNHjM UXUxO2gKTaKBU9ACaUGrqnPSJMfHb/oi0ykcYrzYTylqfQtIpMalnETJDRn2e70ELtDew4mZXiH8jN0V9Smga+AbASdtOUNP4qayEzLZAHga9pjHjTFvfiNqQEIxvllLg3JEqL2y6nAxKYWx6jzkpcXdzvjpCe1iNxJL0AvF7Hd2JUGvzpEtWWgmmz/JKSBOhWtrOmzODlFvFRRqWdf9U9wO432AztZ12mn95BVl+KslznKBHJyLbDclsgdhtC1ACcHByFYoc1jg6lDnOr0NGg8UmIGMGxPbe/s8nRx5wKCAZxvE1FqoUquvHi9w1i+jaxNSBm46LxTgjxXC1mrq/JyJWFflTC4t2FXLr1dSAM7JZUpBDwXlBZuY9QxDPGFqT9/jKUhO3a8XA+0ZJz4vIdTuft7WdLSoTuc6S404XbZS4B7LZixlglYP+0B3om7rnDp09xZHRdCyW5/ImIFLG5Qf+Rz8C75/IQ7zl 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 11/11/2025 2:46 AM, Lorenzo Stoakes wrote: > OK ignore the past mail, I have managed to repro this locally and have a > fix. > > Turns out the swap code is doing something quite insane... I will send > fix-patches to the series shortly. > > Meanwhile I attach fix-patch! :) > > Cheers, Lorenzo > > ----8<---- > From c705fd85a806f53017df31e6b072c4bfa839e3a2 Mon Sep 17 00:00:00 2001 > From: Lorenzo Stoakes > Date: Mon, 10 Nov 2025 21:11:52 +0000 > Subject: [PATCH] fix > > Signed-off-by: Lorenzo Stoakes > --- > include/linux/leafops.h | 4 ++-- > mm/swapfile.c | 12 ++++++++++-- > 2 files changed, 12 insertions(+), 4 deletions(-) > > diff --git a/include/linux/leafops.h b/include/linux/leafops.h > index a464a7e08c76..c4cd36760ea0 100644 > --- a/include/linux/leafops.h > +++ b/include/linux/leafops.h > @@ -56,7 +56,7 @@ static inline softleaf_t softleaf_from_pte(pte_t pte) > { > softleaf_t arch_entry; > > - if (pte_present(pte)) > + if (pte_present(pte) || pte_none(pte)) > return softleaf_mk_none(); > > pte = pte_swp_clear_flags(pte); > @@ -95,7 +95,7 @@ static inline softleaf_t softleaf_from_pmd(pmd_t pmd) > { > softleaf_t arch_entry; > > - if (pmd_present(pmd)) > + if (pmd_present(pmd) || pmd_none(pmd)) > return softleaf_mk_none(); > > if (pmd_swp_soft_dirty(pmd)) > diff --git a/mm/swapfile.c b/mm/swapfile.c > index fd23d9f7ae10..f0dcf261f652 100644 > --- a/mm/swapfile.c > +++ b/mm/swapfile.c > @@ -3202,9 +3202,17 @@ static int claim_swapfile(struct swap_info_struct *si, struct inode *inode) > */ > unsigned long generic_max_swapfile_size(void) > { > - const softleaf_t entry = swp_entry(0, ~0UL); > + softleaf_t entry = swp_entry(0, ~0UL); > + const pte_t pte = softleaf_to_pte(entry); > > - return swp_offset(softleaf_from_pte(softleaf_to_pte(entry))) + 1; > + /* > + * Since the PTE can be an invalid swap entry (i.e. the none PTE), we do > + * this manually. > + */ > + entry = __pte_to_swp_entry(pte); > + entry = swp_entry(__swp_type(entry), __swp_offset(entry)); > + > + return swp_offset(entry) + 1; > } > > /* Can be overridden by an architecture for additional checks. */ > -- > 2.51.0 The fix works as expected. The issue no longer reproduces on mm-new. Thanks, Shivank