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 55D9ECE8D6B for ; Mon, 17 Nov 2025 15:36:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 942108E000A; Mon, 17 Nov 2025 10:36:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9196B8E0002; Mon, 17 Nov 2025 10:36:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7E0EA8E000A; Mon, 17 Nov 2025 10:36:13 -0500 (EST) 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 6539D8E0002 for ; Mon, 17 Nov 2025 10:36:13 -0500 (EST) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 1790E86D2A for ; Mon, 17 Nov 2025 15:36:13 +0000 (UTC) X-FDA: 84120500226.11.C19E6C7 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) by imf14.hostedemail.com (Postfix) with ESMTP id 8DE6B100019 for ; Mon, 17 Nov 2025 15:36:09 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2025-04-25 header.b=bzmvL0mg; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=d9pVIxx1; dmarc=pass (policy=reject) header.from=oracle.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf14.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.177.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@oracle.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1763393769; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=K7htE5jq95wCdzLuYau6S01VC2lwmXoDf1TmOONyrvU=; b=IrZigbpNL4I7K9QFpnTQObdeuCNGVc2tf/+Su/n4NpWmFOqQW30Osttuv1NuxR7ZD3RQgA fAje58SJtGGdHZCHafohc85tVK2K6SID4sYVv3I/oW104NtGKtB7qiYh3K+fNAThjNasbd gMHsh/FMRIg4G9+L+A0Edginbwqem7Q= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1763393769; a=rsa-sha256; cv=pass; b=gpMDdPQuLGQ7pKKfu15qHWGW4/HBOjZ3zwIOPLJdeL1et+/XMDx+g0LWj3onubNXcTak/T 4LMzrmbdHlumxpwvK4QAK73mShom8YqYxvCUOqVxgrI+tVgLVDuuLDxHUU/XJoXMMMjnZ2 FxeVfmSdDPZEpFR1dkITC01zhRc+eZk= ARC-Authentication-Results: i=2; imf14.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2025-04-25 header.b=bzmvL0mg; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=d9pVIxx1; dmarc=pass (policy=reject) header.from=oracle.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf14.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.177.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@oracle.com Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 5AHC8NR3006073; Mon, 17 Nov 2025 15:36:04 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=corp-2025-04-25; bh=K7htE5jq95wCdzLuYa u6S01VC2lwmXoDf1TmOONyrvU=; b=bzmvL0mgapMQ7nlx8P0+0eC/oG/px2CoA5 ScBvLmVrSQOOejVCjGBXAahR0C3t3fW64mv18dFjRhgMLRAtkxqIL5DG6ESpEGm1 MsWmbtmgjwb4NEqxKqzyocVncHckVR2uIGClggEpV6QTP96r0A0qx5inVZgua1GL jjH3aPiehWkOU/7B7+/FX+v8jRz3nEs5Pv8bcY7kd7+pbNLB2MSBBUEVMkXTDZ6d xrVPgnQp+sYS4ro7eT+/eLQY5yRULIEGisAEwr91XfNBWaeaIYx++2JCOQRQ1vE8 gtusmNZrCM2fIXWmLd+d2pjijj+8Q2JyPZ9JRCVKUuhBLqesPM4A== Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.appoci.oracle.com [130.35.100.223]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 4aejbbtqfe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 17 Nov 2025 15:36:04 +0000 (GMT) Received: from pps.filterd (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 5AHFPt1V035937; Mon, 17 Nov 2025 15:36:03 GMT Received: from ph8pr06cu001.outbound.protection.outlook.com (mail-westus3azon11012070.outbound.protection.outlook.com [40.107.209.70]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 4aefyj3j7c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 17 Nov 2025 15:36:03 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=FKj79WMok3tUaB75dGC1EklH8+y2t1J+GqSAkVYp8SwtkNufhe1K50xW0E/udq1BXtYFDVmD/vZ2MNBUXufNOB9ZuvXxM4BKrGhKPKkmrZbWK/Zy3XZu1392EXH1lcSrLopYJOZK5o9XKuIl56920mTa36wLl2tkmsBq4AbWyuMjVzSdqsBReZR9ES2u5IJTL2PWmpWZcaH6/jkQEa7u8PMqAUMXpnQXZqWjM0GM2JSEMQIRoEcCfdCJr0F0qSqc8HWafOghuPg+kxs2+6i5O9Wz4ZtJGqm6sTROiAgDr7yZIs6Lj2EfLyJFZNCmh6u+onA8K4g7uvcjABrO14KkNQ== 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=K7htE5jq95wCdzLuYau6S01VC2lwmXoDf1TmOONyrvU=; b=Qx03wLmzitHt/PE6VG9Sf8U96LI4Cc/7ZZpUuifY3flHFKbJfcQReoqFdUPkESH+Y5PzdAZOf95LgMPaRc0nvo9KuxsTkXIrQ4QmK4lBC7d05VKQmjgy79s//HOQS46jWsXGyx13e+fyBf/Y8hZ9Rycswc23bM6pmnQq6Jfyhd+dPdCr8y5YThc2nyOzvuC9UYeLUtvnx+EsI1WjaxXbX9Fl88OH6NsZD+HPirbhbIIzVIk0OTKWDTR6OMyq/OYFx95P0eCi6JXzVSdWIGlPB+KcjQntVxqiMJIyvHj5hImwJBcxGNO9UxhTGSdegCHFg4awBZnDs7n+zSxrJX1p2Q== 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=K7htE5jq95wCdzLuYau6S01VC2lwmXoDf1TmOONyrvU=; b=d9pVIxx1HyStZwwEmclS99ZidIjRD9PbIm4zIf2Lou6c74ITnQqNXapMKyYrVq/n9fpwwq1rw/GhQ6689aiV5cKmiTPCpkc1LQGLQMyEQQWxIDxQzexd0FKOGVfItCNjbV7P028B3KMHdsKmVQa9XFtBeycnekUeStMGrklo6rg= Received: from DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) by BL3PR10MB6092.namprd10.prod.outlook.com (2603:10b6:208:3b8::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9320.22; Mon, 17 Nov 2025 15:36:01 +0000 Received: from DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2]) by DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2%7]) with mapi id 15.20.9320.021; Mon, 17 Nov 2025 15:36:01 +0000 Date: Mon, 17 Nov 2025 15:35:58 +0000 From: Lorenzo Stoakes To: "David Hildenbrand (Red Hat)" Cc: Andrew Morton , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] mm: propagate VM_SOFTDIRTY on merge Message-ID: <3663ba10-a16f-4520-810c-701fe2d18167@lucifer.local> References: <069adbf6-181f-420f-b2b1-0ca22894d904@kernel.org> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <069adbf6-181f-420f-b2b1-0ca22894d904@kernel.org> X-ClientProxiedBy: LO2P265CA0404.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:f::32) To DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB8218:EE_|BL3PR10MB6092:EE_ X-MS-Office365-Filtering-Correlation-Id: 1c58dd4a-4d63-4235-e9b8-08de25ef02e8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|7053199007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?7NMUXSzGYCgKWJwWp3USO+ISVUmzL1+7L5s6O2RkU27/smQIAJ/uuGs/J0UX?= =?us-ascii?Q?cKN45NBRZb+oTre1CQIjpCTVEJIw5mQecz9Qw+vzE69ql3PF6MK8IZlOUHTh?= =?us-ascii?Q?tzaSOwb8QwCXLFIHVsep9TMcKkeB6VT5mB1egu1Q9oIej7bKJn7ocfnXesGT?= =?us-ascii?Q?z8kwaADNjQoR0TIMqTOoKBXxxHLMDCoLNvs4i2PETfSEKbiySqbmct/Vjzgt?= =?us-ascii?Q?Ov/Ht1pszNbljDCO9sNxvRLw+aJPk4PARIfe3c70htoJwatt0s8WJUlfjkrf?= =?us-ascii?Q?aEN6oYTT9jeUcNEgX9H9PTNZoQoXydYpCL8HHDNYhArcVUsaD/oTKy4AtfiO?= =?us-ascii?Q?92n09+0MdszU36XztOa3dUzOcW6j+BMPj6PJkI9rPyzUPECahO5jyvS5Enf2?= =?us-ascii?Q?XeBkOVhrsC+W1sLsauC5eONfbWzEkCLVs4ztHkGIpBZ9N/xDK6XWGKcfu/qF?= =?us-ascii?Q?94+1HqX6C3TQLmhzAAeKfMQ7zvNrkVWWmor5TNveYWmyu2uqQpgGkTp5MrJ9?= =?us-ascii?Q?bsrWI1rfsjdqBg5g2rObU0XN5C6ZWJ+3CMxLF5RNpDq96mHVqnk6D5MVoled?= =?us-ascii?Q?KeEIk4IeMgPRQy2qPaBf9G0uJl9LtU5KB1sMIEGuta86mk46s5jsxk/OnYZl?= =?us-ascii?Q?pclhKYqNVq/EmCypwgvRQfGEvO4hzDRVXoLDHWdBgnqfFJoVnXHSUY3bNGnv?= =?us-ascii?Q?qqc6ZSYDLXhC0zOA0jeqFaxDe0saoHTL8EzCVKn0FQewib+OPB2990jpwALg?= =?us-ascii?Q?WEBiPxUs8po4Qxhyos6k/ugGmy9z8KLty7F95UTNla05VOXikXL+2ucJUab9?= =?us-ascii?Q?NEh9mj4K0m8Lazug88xhh4ipkelxAstBDepl9qQb8HrNCOp04lztW+cpuIFd?= =?us-ascii?Q?KdwQkPMU5PfHH+h+HyLD/CbOKL8cMhUvxtws0UNeuH1MNjxiKrQpaPLS6HqJ?= =?us-ascii?Q?PQgvAjofry9IgKyeEFX5PXaV/7BxB/hW1TlHyUbRUsLH2Gx15d7qrj6p/qOK?= =?us-ascii?Q?MkacrPslrlsbUzspMWrHs3Igr8mt2cwj+kAT5B/DD+grCgafoqMB+jr+pblB?= =?us-ascii?Q?dQ29VzfPHtEYgzBQi+6lqY3L+VHSQc55zy2A21YrnfkMBGmDyEgeQLg0pDgf?= =?us-ascii?Q?IPIpgoQUMlBfxrN2QIlQg1KUqWzbpt0NkKtsWZJr2LYpcmVa00j4DvYAfNld?= =?us-ascii?Q?SR/34lN32LJZ/XqN72PdMxuY7BeDOmQkrSg5J+qmzVZ3KrzTsj9PU9tIyPpm?= =?us-ascii?Q?ZEicQu4RVYBytKAgbhZNqtDUeb0dZLyhJkdpkgHwbQUXSfjL/Zwwg/1xwW0d?= =?us-ascii?Q?bGW4Wcj0h2REcq+e8e0IP6hEpSGSGuFiqR8QyUWYTE6tO6dp3cytumshgBLp?= =?us-ascii?Q?ZYVugwLEOea79ARwLenk2ipN1NMzrNJTgPpE6haTn4u+d1XkgUEUzgFpPkQ7?= =?us-ascii?Q?uIA/DyGYjahLWvFu/IPFGfOOJspY/+u0?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR10MB8218.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(376014)(7416014)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?wwIH8zWTQjbrVuhzEvmMsH3XmoTCQLS7eoOPfjzvTpL0lexxYb/vvCohrzqQ?= =?us-ascii?Q?bolEkoCOyjWKTNyWL20Knipw0apvcxh7Uz6tz4E12lIAQzp7hGP3a39QouLs?= =?us-ascii?Q?TSSUFo+1+JLDrp0yybONLA2fzlITpGBlayz+n6Bke6PrlVIjvXhPvBBOVQtK?= =?us-ascii?Q?yXC4NchPIg8liamYGnPxGrcE3ZKKf6xj//pLZW67n83158ujvgHNzPQdo5NM?= =?us-ascii?Q?mdyaA5Xh8ER08vQqMpc7uRGbMwRKbTGntdoggXdJ/z9ZO1L5GGLpwFTr2aWV?= =?us-ascii?Q?vDchpj3o2KgwGHb1aiMZTY2PAwa7d+e68A/7Gwx+S2+9Gz1LlKktnAufvFPs?= =?us-ascii?Q?tRhRrSrbTuVorHyo5vixseyitqOQaS4000AZy0Qg9GSmRzVFfinXykVQeXlB?= =?us-ascii?Q?qCYMFEg5erqYuUyBlVLttXKlVNGwmXbfGsQWAYLgDfLZx5SuWtj/wQyvOZD2?= =?us-ascii?Q?kbJ+GJRl19DVWGMZ0hONx8MhiKyjW7JWWVqKbVuICeprjzzFFbS4cE+5RaO/?= =?us-ascii?Q?Bffy0FGfRbmqDCHSdlLvv71/SLE6eTr3J4TM3xTJ/l/qGnnEhV2SwZLHWbR7?= =?us-ascii?Q?UtDwp8Hrg4JUDBSRXYksGPey2HcK0PxyjHIZ6eEIkNYy7Y1Qhv/WSQMOiftp?= =?us-ascii?Q?b9n7OW7O/0E94cdHk1D+79Y2EyGzFVnMSY6mSCYRjFbMdZeRqMO9Db5HJ8l4?= =?us-ascii?Q?EM7qQn+IF7jRPHOVDNe21ODlC3/uNgBnT2OtaPWmq6Bcajce1QfcIacy24Ac?= =?us-ascii?Q?hjsL09ed/T7MZUnm+C5+7a9bQp+ZiKVTNlLtzeRFOnUhH4J5kRsn3ZIIS5hx?= =?us-ascii?Q?Cqo0YRUsAcDTj45n3koznQG5Qy3LEmjUyeL11aGx7g9CYkL7d0bweLkVEXzg?= =?us-ascii?Q?TE5mQPXthtpSgM7c1uuD6gP2zYtRK9aMEYk4n4rQdjzlrDHe3RfBmkLC9EDr?= =?us-ascii?Q?TrzkPoXuVFGUKicKi9x2MJcN6fWYwEChvsjFisiMjRR4BSyQjRSdcOrdnkYO?= =?us-ascii?Q?JKef5SghUawhiwgoL9JhNOj8c79V/qtB2vDKinmDZXBf3G4mnpcK/tvYzPrF?= =?us-ascii?Q?lnz2nn4/Sj1kxe9F19PA8Zn6HJnZY10ob9AJ+h0Jgsidwla0VtQ8mQNgDGO1?= =?us-ascii?Q?iFONPKLb8qDimyylTOh8xpS3hcA0a3scn/0UtSKsTxQaNsVXQIsXEwVFkd5S?= =?us-ascii?Q?F8NX8SLFZof2mapFeFVUiWWwTI/tk09WrjRcDE0XuPwlvZH0Sr8uwfNapmS6?= =?us-ascii?Q?iSJLgGOFl1OTPMSGQa2z+1gBKRc1wQ8MEO/ioVAycweGTsZiZJmaibAQzk+w?= =?us-ascii?Q?EDGVQ+xQVbS/l4sbRTMJsldGVyb/SokUFld/bm0MiJ41SIvq/RSN+XMxFWCr?= =?us-ascii?Q?iYc2ePpi30/TYJuGlYmQY4u/K1q9kvaeNdPfGBHA+94jAPIldGG/oMATGNzF?= =?us-ascii?Q?fWpq8Q5p1ba2DDStjYiNsdF/42Baq3i0bS7HRxTk4ZHpISmreMO9N6O3xtQS?= =?us-ascii?Q?ov3o2a3iXV8LR5Ln0NIV4V+r7U1EGBWeB0xSiarumMwawP0NcTnl88IX4Ziq?= =?us-ascii?Q?eB9YBdbs1v5CAOCuWS9YOdUESbhXifacctcC6VGTcfjkm2iUgb2rogzR4C2a?= =?us-ascii?Q?XA=3D=3D?= 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: 1c58dd4a-4d63-4235-e9b8-08de25ef02e8 X-MS-Exchange-CrossTenant-AuthSource: DM4PR10MB8218.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Nov 2025 15:36:01.0261 (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: MBPLmAwfGticUL4mmFjJwapNJC8M38LV8rsOedvh7Qoc98VG/If9a6wtTR29E7sse+e2FlyxRVQzIlCt7c44Z1H3TegbJP18SZEv1UW2y6Q= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR10MB6092 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-17_03,2025-11-13_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 spamscore=0 bulkscore=0 mlxlogscore=970 phishscore=0 suspectscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2510240000 definitions=main-2511170132 X-Proofpoint-GUID: ExLvCE8N3iM4j3E9mIDHxMHZ28mtwevx X-Authority-Analysis: v=2.4 cv=JZyxbEKV c=1 sm=1 tr=0 ts=691b40e4 b=1 cx=c_pps a=zPCbziy225d3KhSqZt3L1A==:117 a=zPCbziy225d3KhSqZt3L1A==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=yPCof4ZbAAAA:8 a=VwQbUJbxAAAA:8 a=KqlOEK1dFKdBYh2KpIEA:9 a=CjuIK1q_8ugA:10 cc=ntf awl=host:12098 X-Proofpoint-ORIG-GUID: ExLvCE8N3iM4j3E9mIDHxMHZ28mtwevx X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE1MDAzMiBTYWx0ZWRfX0wCGEl5nah2t RHmPdNHV4F+HQmhOAeSHn09INF3O0myjvTPSwN3OJPuQwqv5WjV00NACr+w3EPG04OU/9S9zcfW YPzm1RFzxHYrMBrftZNx3pmrqsCdpCa/3H5tYLyqcLAOPEECIAUdfCalakN5a3/4QZETAsU/Ch7 yVHhHgxzBI/APS2kXN37DVXu5l8FN1XLSLKO3ykTOm4MlSbh3kG2UzLSuom4ol/4rLA6ILmA5dk XD0NaRjKFbUJR51u/GXXvxQrLDsESM7iuK2FErTiddj8NA7R5/uD8yJoDIHGvXwQEZp1JnZBbdC 18t/3BaAC3pKkGQ36/FMUIHH7FX7MxBRgpZtKn2KaC729UNmYzMhiCDHXo9eQjp+CT1zGVwyw05 5LLIH6CTQZneKcDPGdy7aqkeefOp6d8WwB/vCWpsZAjeW9fv7b4= X-Stat-Signature: yy9u5a3ckbz6uhtoxf1yx3tdt1kuk6jc X-Rspam-User: X-Rspamd-Queue-Id: 8DE6B100019 X-Rspamd-Server: rspam10 X-HE-Tag: 1763393769-984502 X-HE-Meta: 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 lmzon1k5 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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 Mon, Nov 17, 2025 at 03:25:05PM +0100, David Hildenbrand (Red Hat) wrote: > On 14.11.25 18:53, Lorenzo Stoakes wrote: > > Currently we set VM_SOFTDIRTY when a new mapping is set up (whether by > > establishing a new VMA, or via merge) as implemented in __mmap_complete() > > and do_brk_flags(). > > > > However, when performing a merge of existing mappings such as when > > performing mprotect(), we may lose the VM_SOFTDIRTY flag. > > > > This is because currently we simply ignore VM_SOFTDIRTY for the purposes of > > merge, so one VMA may possess the flag and another not, and whichever > > happens to be the target VMA will be the one upon which the merge is > > performed which may or may not have VM_SOFTDIRTY set. > > > > Now we have the concept of 'sticky' VMA flags, let's make VM_SOFTDIRTY one > > which solves this issue. > > > > Additionally update VMA userland tests to propagate changes. > > > > Suggested-by: Vlastimil Babka > > Signed-off-by: Lorenzo Stoakes > > --- > > Looks reasonable to me. I thought that we had that behavior in the past ... > but I also remember scenarios where we would have imprecise soft-dirty > handling. So I assume this was semi-broken for a while (soft-broken :) ) :)) Yeah it's only specific merge scenarios, and only when you e.g. already cleared refs then mapped a new VMA and it happened to merge. Nicer thing about this change is we stop treating VM_SOFTDIRTY like an exception on merge :) > > Acked-by: David Hildenbrand (Red Hat) Cheers! > > -- > Cheers > > David