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 C8F70CAC5B0 for ; Tue, 7 Oct 2025 06:18:27 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 29B2A8E000D; Tue, 7 Oct 2025 02:18:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 24ADB8E0005; Tue, 7 Oct 2025 02:18:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0C4BF8E000D; Tue, 7 Oct 2025 02:18:27 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id EA5658E0005 for ; Tue, 7 Oct 2025 02:18:26 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 87801C07FA for ; Tue, 7 Oct 2025 06:18:26 +0000 (UTC) X-FDA: 83970313812.16.DB6CC8C Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf18.hostedemail.com (Postfix) with ESMTP id 17ADC1C0005 for ; Tue, 7 Oct 2025 06:18:22 +0000 (UTC) Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2025-04-25 header.b=nzNovzh5; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b="hGCyGE2/"; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf18.hostedemail.com: domain of ankur.a.arora@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=ankur.a.arora@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1759817903; a=rsa-sha256; cv=pass; b=tsI5ErKzROMlVtLOhcx5qHaylvPOW8EYAFYL77nQrd392nwXTy4aVhMo+wZoDJDrPISA2Q idDXH5PdV9I1f9W28cM5TE3rblW3nFRkbxkkVE9z6YbvdF89Ql/pVnEW2dbN5YlD9zN3VW 63bGD8AD6vCAJMaznrF28rexOO8EnaU= ARC-Authentication-Results: i=2; imf18.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2025-04-25 header.b=nzNovzh5; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b="hGCyGE2/"; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf18.hostedemail.com: domain of ankur.a.arora@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=ankur.a.arora@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=1759817903; 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=Ex9zjkK4vRV7XVyY3EhAgjim3QV2BZGHFmT4o1drYzA=; b=VtgoOgtFMxASowhIkdOWTEzM8seycXcrVQ+WTMpzVjtZ2+Atj7QE5qF2Yu2/Sq26U63Q+9 Op35ieJlSfQm9GP+J8PPH6hIo/gQSAPbiGPbivRdN/eXLllEymHyaGeKcq0gkPmMC00Nws PhLKEnyZlpGNHFd0JqFF6J76xBYFBhQ= Received: from pps.filterd (m0333521.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 5975dXJj025867; Tue, 7 Oct 2025 06:16:01 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=Ex9zjkK4vRV7XVyY3E hAgjim3QV2BZGHFmT4o1drYzA=; b=nzNovzh5RIei91DQJrm5+tIpMX/oPN7NG5 /804QXVZ3+/BrxGMUPoZslWx36iuU4GkAMR3oVcdafhSH953bneem0OT30v5fWGS ozGl2kLHYKaRnIVQ0V9wVWKCCfUXl4sr3/WEwGF5e0HfHeD8WyOcylKCIUh2HQzV aj2pwv3ULyHkRP7UaLy2PyBGXyMISoR9gCKZkF5hEKoKbk+OUwL4huJXIf9wTcFZ uxG+sPyXysL3SUOY4/rq522SkJ1/QgVsy9MTALk5LcS0RwRaKe37ZRnohIQanbyr Yl85pKaHPtCUPqgh37QQp99VMlz/NYP3urArVcbkZvMHw7Q4TG8g== Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.appoci.oracle.com [147.154.18.20]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 49mvwf01xr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 07 Oct 2025 06:16:01 +0000 (GMT) Received: from pps.filterd (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 59755XEm028646; Tue, 7 Oct 2025 06:16:00 GMT Received: from ph7pr06cu001.outbound.protection.outlook.com (mail-westus3azon11010061.outbound.protection.outlook.com [52.101.201.61]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 49jt17sbg8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 07 Oct 2025 06:16:00 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=pjmEErZg76jYjB3lasAVMkAXirmp2XrdaOsSRa+spqX9y9JwIyNDtsTBbVLUgG2Fry67f/bO1nfqL1X4GUt1kGx78bnLtagLq222dGzu7gslb9HoJYI9WysNE45hLaoQnZO8KhMOzh0cP3hpwwNbdw9dr3qg8soHonQBqiWS663S2yoLI69B7KMmH0J8fcgn/Qah8kVsOprjZCfdwvlycvAuoOfcJCuphps0ciRmFgRG381loDWlst/1OqnCFfe5MV+xWuhvZwhy8LDTOM8Z41uWOUBktJ1hn/wvf+qH427lIk3ipQPVPFJKoG6/6n79w94NGJfc25pKkhF+7boTcg== 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=Ex9zjkK4vRV7XVyY3EhAgjim3QV2BZGHFmT4o1drYzA=; b=rzhfnRjqdF6KZZKP907XR5T/8fQ2skJSrAI0cNYMcJzNPTSz1vhr9v5ET/XGgFR1N39j9TJq7t98jklcLz5rzVAw+dCpHd7phw6jMyihYQ09bjzoZGhNq9mCUJRvHC9XLxeV3q+V6bfUUwLap3/LAlN0QI1AlzurcnMjVedRokYh8D9rYJSvjf98BFaY51NeG3l40RcRnYPJI0KpHNnkTvAat6Fgy57DJpEHSSzPmleoSus96HSckdm/wHML2vprkfdBr3A41sn0NIvqb6r1FwRRfm92LGVgbtnDq3/+qrF4dTaSo2mDWCD7+HV+QszjeDhsUmbiVZUKNVnlK2kqhA== 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=Ex9zjkK4vRV7XVyY3EhAgjim3QV2BZGHFmT4o1drYzA=; b=hGCyGE2/sELTBBPL9BKZBVDvz+5ASuXhgfbtQK1vKQq1ildumj1GaQK2tLgLvsUUjbaRA5wQ6y2j8WnSC34mqMOpos+HQvXOktHOsruqJGQN56oNsYTLBRLh9DIuntMZnqbj66NFVhshNYMDo7iBbHn8OLbmcBoneMlL6cgbYdM= Received: from CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) by DS7PR10MB4975.namprd10.prod.outlook.com (2603:10b6:5:3b1::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9182.20; Tue, 7 Oct 2025 06:15:52 +0000 Received: from CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::3c92:21f3:96a:b574]) by CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::3c92:21f3:96a:b574%4]) with mapi id 15.20.9160.015; Tue, 7 Oct 2025 06:15:52 +0000 References: <20250917152418.4077386-1-ankur.a.arora@oracle.com> <20250923062935.2416128-1-raghavendra.kt@amd.com> User-agent: mu4e 1.4.10; emacs 27.2 From: Ankur Arora To: Raghavendra K T Cc: ankur.a.arora@oracle.com, acme@kernel.org, akpm@linux-foundation.org, boris.ostrovsky@oracle.com, bp@alien8.de, dave.hansen@linux.intel.com, david@redhat.com, hpa@zytor.com, konrad.wilk@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, luto@kernel.org, mingo@redhat.com, mjguzik@gmail.com, namhyung@kernel.org, peterz@infradead.org, tglx@linutronix.de, willy@infradead.org, x86@kernel.org Subject: Re: [PATCH v7 00/16] mm: folio_zero_user: clear contiguous pages In-reply-to: <20250923062935.2416128-1-raghavendra.kt@amd.com> Date: Mon, 06 Oct 2025 23:15:51 -0700 Message-ID: <877bx7gru0.fsf@oracle.com> Content-Type: text/plain X-ClientProxiedBy: MW4PR03CA0334.namprd03.prod.outlook.com (2603:10b6:303:dc::9) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|DS7PR10MB4975:EE_ X-MS-Office365-Filtering-Correlation-Id: cdebb86c-6736-48a6-6f93-08de0568f7be X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|1800799024|7053199007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?DranV6A6+tMUHSDMBiWkiDodRDxwqBLI7/gk8xGtGd6opFOSP1CSPu6XqYUc?= =?us-ascii?Q?S1XXrg/g3oV7Z1VhpJOQlF2Lcht1VtgVkNuLrlKk66AN8GOz7Ncubs9xNAJF?= =?us-ascii?Q?O7NtA1T2zzv+v7ht1Tq9IMbjiUTKgNzKNBaMSdI8l5pHwuNnggAw9JE4CMHL?= =?us-ascii?Q?Jobv32/BTdv8GtruK1vfU81JrKPN27bnaaQ+TDUvk8G4H/CegKMvomINKu11?= =?us-ascii?Q?s+z3+4oiQH40OdwguAkBCrJ5fzwXqzDM4/eWHvVr2sM1exOmLMDjfOYbpbGU?= =?us-ascii?Q?M3+fIAeJeRkqj06hKdiPrrT/x2CYAZsoKsJ/otYLBDm20epOZTYC1trG/OXS?= =?us-ascii?Q?Nd7Ep2SSMpG/5b5DGYv15BAHBKPGvSw8H2v6nMdnJkX2/Fi7BueVm92qwcQY?= =?us-ascii?Q?Tkep/ntO/TOBAk7H5+f/FX/UdkS165vBkY0NyKbQL3gQ1/J77pLcfoscA3QR?= =?us-ascii?Q?CGzwUMeP0C9lWCP+qCLnQaKIrAdPE50Cbs3yGMZtwOMZ4VaxkTwKwHAn/U7U?= =?us-ascii?Q?yfYjPTGp2Pd08jnIh/dOxZosCxzqWLzkjPH9IWqLKJqmTDPOAbX89hkPiSuN?= =?us-ascii?Q?9U05MIRgZK62O+ursU5whdexaqvLEuqZaKW3mSgpz32babMOoIs0KPJx57BT?= =?us-ascii?Q?VPUnZDlXKGVQO7MDeI19ErQlXD7VL12isk5hpkVqY0XnJbayikyWUnhG/Q1c?= =?us-ascii?Q?rc2B8QCUSFgUUCxZpp2YZzWbdwE6f4fIJ/EBlucG71zJvuM9rRwdhEyS+FAI?= =?us-ascii?Q?aDaNiuAx1rGS9GLh2aGr/PDmj+uuEdBK/gExSKj9QWC8+9ZiwQobXHhIdpht?= =?us-ascii?Q?GzlQ0jv37m0Yr6rvxl9whelM7cAxqS+3ocUMsVJdzcPQ5l/LpLiv0HCxXGrt?= =?us-ascii?Q?XqskQewjoz2mx7sTxJkFr7GQs+GCAn+4vnueXPyBKZ5WbGbqLpV+cFHYKc/z?= =?us-ascii?Q?xUBa15MjZMsJmFbke/33eVkQjZ9FnXX6e49L+iNvVaR7iA6vXZ+4RzEObEZt?= =?us-ascii?Q?n15vNJouJV+w0uMCRgeVenZlXK/2odaqRgh738AaGTO6pjmT0Zh/xwdBVe0R?= =?us-ascii?Q?EUgKzM6B04E++YygcT5hqOzXI0NMRRcOUICOunMmnmaFjUBY7GJYrrI7bJ/i?= =?us-ascii?Q?Ub3Y2ev2gWzOtiMMlQF12TbUaYFaAQFfmd/eayOIEHTgRgjSlLZZ/8dC8q3n?= =?us-ascii?Q?4ugcvk9m4qLJBZChuwSPpv3PO9Wv03EfWPBlx3B0IVtpM9VNkFwLHFAS90su?= =?us-ascii?Q?7CvkmYeyrzBX3xm0Waj7k3KcrIRdLIleJpML5aQcUWMRidycMtM3uShqmNBf?= =?us-ascii?Q?9sq/lxjvZrRG/ggaRAfNapGD+PBk3ZgEBZpxMLpuQRLbQymo2Iu/asST9uKW?= =?us-ascii?Q?IA/6okDTAUMAViuGeOU5NKrUkRUHnknAm/b/JuenDAWVlTcN+5MqHo0MoQB2?= =?us-ascii?Q?+fHHYl9oR9gihtiYw3ixwLdz3QKx9bJF?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CO6PR10MB5409.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(7416014)(1800799024)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?4xnm5w+is+//5x2huC1cv6wyZVfSYDTu0Vo6nxn2oYhrpXPyY7wgZdxLsWxa?= =?us-ascii?Q?Ot44MJk55rYEls5dC14ZHulY2NUd+23oZxHqIjAX5iuunBYJOVCNqz+bOtDB?= =?us-ascii?Q?w+TxrAvAmGLWic2w5azULoIrqWhj/soBNhq1bOFaI2j0vRI+bWy+0Kcoa6w2?= =?us-ascii?Q?R8K6o/JKXMxs1fr4dEIIvYf0FDhHn47PiArG5SocUk9PQlaCaFRiovNa3CoF?= =?us-ascii?Q?aX6m+kcGOnHzoFwErRFwIw1t4Azi1qpn54YPTHhhpa0fTX0arEC90+68PZpq?= =?us-ascii?Q?PZ++hg+msupVEQOLE/J779PPov3kTVh3iyXl05m0lR6BYt4yQuwWFnSNXrfA?= =?us-ascii?Q?LOLnR7qoiHsBGjvjY5TxSCULHB2Cz9+ipF86/9VbcaS7WxNjZtrQwPwdUVQK?= =?us-ascii?Q?DcP+LbdYCnRb+qgTAF15JPxb5cdz5LfwisIWyT3a4XpDZ/xI3AdRbs5ZNoqN?= =?us-ascii?Q?z6kyHQ4tWKDDoQZCZjlgcTUpZLNXY/sJBWEsvEtGVdAxnZjZ0WIjJBeMS4RA?= =?us-ascii?Q?+pxMvAMm32GQ+I3ZfFAaTTU4pzAe8OS0WiAtGx+q22xkDLHJA1RKBaNKEHEB?= =?us-ascii?Q?6LPBgofzpLMPDyfCBe1Vvqr/Av+3XNPB/Rt/KeHGM94lNYHiCtcOLuatvYNZ?= =?us-ascii?Q?EMu0MaEPxMRDo1fJ7uJFrKdta8DCjVKXzokmzdYYRUnSPIJt6xiPiTBARlXp?= =?us-ascii?Q?VBiNoVpjZga9+0BcEr+DXmXfuZ08dcJcEt5y7UryJQ0zWOf7T/kPvgUwzdlc?= =?us-ascii?Q?1eUAeE3FDwKEibdvN3+yLnUFFl2JoR9zbQMVHhEdzjypETiUKLlAzWAYJFlO?= =?us-ascii?Q?SmA0ekGlsxvKOq3EdQCQf1WmOpk8iJBDv77HHBP/cytJp8l8UaZcr5z3Hejv?= =?us-ascii?Q?jszmu0MzEj178CmiUbOTSZ0o6vo7w6iJfEweTspMJPs+Ic3BXe2zB6dNLEGS?= =?us-ascii?Q?IuAV53GmPy730lq2xbyPzIbyfgy7lDBSpEfpO7Ai682k+F+w56RSOlTt4hrn?= =?us-ascii?Q?gfoTA4xROj7WZSDCDq7+cgeHOKcQJvhqRcxtcpOGkJV/N3ApC/PUgaLzT0iJ?= =?us-ascii?Q?ZGpMaB6v89cGP8BONryPkwNQ+2DYa9SkTZ2tjXq4GYAunqpm4s6D8H+uTbqU?= =?us-ascii?Q?/gNaxLaQ/ABTYo0CAMY1uIMqMdGxROHoIQaoTcxAKX1z/3KxwFfr7MECM7j0?= =?us-ascii?Q?JWZa4nUvllBczOC206x7uLqsO/jJGn0kcRvVkvmtB47ovqtWgokqTwPRBckT?= =?us-ascii?Q?WGzL7EQASkRTvFuJrBQ28GxISC0uwlaGyLyNajn4vQM0So6SJeMab3R2oSnN?= =?us-ascii?Q?cvJ1Nw6XaomNymH1isXWmtVIgqjgfhiexRZjDZALTxQKT6baIqTKBNRGoRkQ?= =?us-ascii?Q?j87GVb680YZcbUpSgPi/iI66rW9yOKnNo9ObIiiRHRRK/6L0cXj1IAauTgd2?= =?us-ascii?Q?SHPyshtl9XS/nVczWjFsnoSAdCgn4dfgv6r9Ib/OoQRDIiSMs1t3iaNiVtif?= =?us-ascii?Q?R78FJ8EMtybRCv6QMUOXFF00oPMUVSH3hl4G90HhfdYpdQtqSrQXdZogGCmj?= =?us-ascii?Q?+4SseovnfB9sbak3tKzRLAqNfISMi4U26KYC626NaA/Ko7fe+z1rSMOsHFf7?= =?us-ascii?Q?Zg=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: cdebb86c-6736-48a6-6f93-08de0568f7be X-MS-Exchange-CrossTenant-AuthSource: CO6PR10MB5409.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Oct 2025 06:15:52.7788 (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: dY8sbdJ4xqwZrFNqrCqdvNJF618BMuHWJK9s1k6xyVQOyJWHH4LzVV5mtZk88Eb6Ff9q2+V372jqltIKprxiI3Lrw6V5qK/4CRjZKngirsY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR10MB4975 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-06_07,2025-10-06_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 phishscore=0 mlxscore=0 suspectscore=0 bulkscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2509150000 definitions=main-2510070048 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDA3MDA0MyBTYWx0ZWRfXyNCRiDOcLNv/ sqCptPb0MwP9y9+a4o75tkcx9Uvz14qVzppsNHSyYebkull8BZ2KYw22y79C2yZs3HZ7Of8ivrF d7ukXgNX5XoCaQnrWbmXQ4mCKrbj5nXnx2Jn2jCQ5LzuTBKHVeSbfTKWdMp/ns60bqwE4Xo0IDZ w/LtjZWVRuDz3rZyE61f9dS8r9OY9WLsal/5mCiZi4uDwbv46C65LoBezOyepcmYmkcOo4iClIg dpLC+HsT5+cIgAYNhSjmj3DPCMBnyDf7a3m/2J1Bi0mscmHDVp11RBD028AhP13L9jMur9boZUp kDhmLcU25q4wbrMcVHq3nm6VwyAqjerAPvNV6jfypjXDi5CHILwpCrDiawB1aJrbjIf26UEMp8g +SK+5EKMD7sOQOlouuFUkbk194I1wB4HZ2+P9H/wS8XMHV40x+c= X-Proofpoint-ORIG-GUID: VmxlQN8RHikxefF0msbnfgg8IOrD8EfF X-Proofpoint-GUID: VmxlQN8RHikxefF0msbnfgg8IOrD8EfF X-Authority-Analysis: v=2.4 cv=PMcCOPqC c=1 sm=1 tr=0 ts=68e4b021 b=1 cx=c_pps a=e1sVV491RgrpLwSTMOnk8w==:117 a=e1sVV491RgrpLwSTMOnk8w==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=x6icFKpwvdMA:10 a=GoEa3M9JfhUA:10 a=zd2uoN0lAAAA:8 a=n-WBVzomqE2Cf-J3H8IA:9 cc=ntf awl=host:13625 X-Rspam-User: X-Stat-Signature: e6nnwndupih7akodds9cdjewm3fcmhpo X-Rspamd-Queue-Id: 17ADC1C0005 X-Rspamd-Server: rspam09 X-HE-Tag: 1759817902-731342 X-HE-Meta: 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 zNhbJ1Ux 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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: Raghavendra K T writes: > On 9/17/2025 8:54 PM, Ankur Arora wrote: >> This series adds clearing of contiguous page ranges for hugepages, >> improving on the current page-at-a-time approach in two ways: >> >> - amortizes the per-page setup cost over a larger extent >> >> - when using string instructions, exposes the real region size >> to the processor. >> >> A processor could use a knowledge of the extent to optimize the >> clearing. AMD Zen uarchs, as an example, elide allocation of >> cachelines for regions larger than L3-size. > [...] > > Hello, > > Feel free to add > > Tested-by: Raghavendra K T Great. Thanks Raghu. > for whole series. > > [ I do understand that there may be minor tweeks to clear page patches > to convert nth_page once David's changes are in] Yeah and a few other changes based on Andrew and David's comments. > SUT: AMD Zen5 > > I also did a quick hack to unconditionally use CLZERO/MOVNT on top of > Ankur's series to test how much additional benefits can architectural > enhancements bring in. [ Inline with second part of Ankur's old series before > preempt lazy changes ]. Please note that it is only for testing ideally > for lower sizes we would want rep stosb only. and threshold at which > we need to do non-temporal copy should be a function of L3 and / OR L2 size > perhaps. > > Results: > base : 6.17-rc6 + perf bench patches > clearpage : 6.17-rc6 + whole series from Ankur > clzero : 6.17-rc6 + Ankur's series + clzero (below patch) > movnt : 6.17-rc6 + Ankur's series + movnt (below patch) > > Command run: ./perf bench mem mmap -p 2MB -f demand -s 64GB -l 10 > > Higher = better > > preempt = lazy (GB/sec) preempt = voluntary (GB/sec) > > base 20.655559 19.712500 > clearpage 35.060572 34.533414 > clzero 66.948422 66.067265 > movnt 51.593506 51.403765 The CLZERO number with page-size=2MB is pretty impressive. But as you said that non temporal instructions need more thinking related to thresholds etc. > CLZERO/MOVNT experimental patch. Hope I have not missed anything here :) Looks good to me :). > -- >8 -- > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 52c8910ba2ef..26cef2b187b9 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -3170,6 +3170,8 @@ config HAVE_ATOMIC_IOMAP > def_bool y > depends on X86_32 > > +source "arch/x86/Kconfig.cpy" > + > source "arch/x86/kvm/Kconfig" > > source "arch/x86/Kconfig.cpufeatures" > diff --git a/arch/x86/include/asm/page_64.h b/arch/x86/include/asm/page_64.h > index 2361066d175e..aa2e62bbfa62 100644 > --- a/arch/x86/include/asm/page_64.h > +++ b/arch/x86/include/asm/page_64.h > @@ -84,11 +84,23 @@ static inline void clear_pages(void *addr, unsigned int npages) > */ > kmsan_unpoison_memory(addr, len); > asm volatile(ALTERNATIVE_2("call memzero_page_aligned_unrolled", > - "shrq $3, %%rcx; rep stosq", X86_FEATURE_REP_GOOD, > - "rep stosb", X86_FEATURE_ERMS) > - : "+c" (len), "+D" (addr), ASM_CALL_CONSTRAINT > - : "a" (0) > - : "cc", "memory"); > + "shrq $3, %%rcx; rep stosq", X86_FEATURE_REP_GOOD, > +#if defined(CONFIG_CLEARPAGE_CLZERO) > + "call clear_pages_clzero", X86_FEATURE_CLZERO) > + : "+c" (len), "+D" (addr), ASM_CALL_CONSTRAINT > + : "a" (0) > + : "cc", "memory"); > +#elif defined(CONFIG_CLEARPAGE_MOVNT) > + "call clear_pages_movnt", X86_FEATURE_XMM2) > + : "+c" (len), "+D" (addr), ASM_CALL_CONSTRAINT > + : "a" (0) > + : "cc", "memory"); > +#else > + "rep stosb", X86_FEATURE_ERMS) > + : "+c" (len), "+D" (addr), ASM_CALL_CONSTRAINT > + : "a" (0) > + : "cc", "memory"); > +#endif > } > #define clear_pages clear_pages > > diff --git a/arch/x86/lib/clear_page_64.S b/arch/x86/lib/clear_page_64.S > index 27debe0c018c..0848287446dd 100644 > --- a/arch/x86/lib/clear_page_64.S > +++ b/arch/x86/lib/clear_page_64.S > @@ -4,6 +4,7 @@ > #include > #include > #include > +#include > > /* > * Zero page aligned region. > @@ -119,3 +120,40 @@ SYM_FUNC_START(rep_stos_alternative) > _ASM_EXTABLE_UA(17b, .Lclear_user_tail) > SYM_FUNC_END(rep_stos_alternative) > EXPORT_SYMBOL(rep_stos_alternative) > + > +SYM_FUNC_START(clear_pages_movnt) > + .p2align 4 > +.Lstart: > + movnti %rax, 0x00(%rdi) > + movnti %rax, 0x08(%rdi) > + movnti %rax, 0x10(%rdi) > + movnti %rax, 0x18(%rdi) > + movnti %rax, 0x20(%rdi) > + movnti %rax, 0x28(%rdi) > + movnti %rax, 0x30(%rdi) > + movnti %rax, 0x38(%rdi) > + addq $0x40, %rdi > + subl $0x40, %ecx > + ja .Lstart > + RET > +SYM_FUNC_END(clear_pages_movnt) > +EXPORT_SYMBOL_GPL(clear_pages_movnt) > + > +/* > + * Zero a page using clzero (On AMD, with CPU_FEATURE_CLZERO.) > + * > + * Caller needs to issue a sfence at the end. > + */ > + > +SYM_FUNC_START(clear_pages_clzero) > + movq %rdi,%rax > + .p2align 4 > +.Liter: > + clzero > + addq $0x40, %rax > + subl $0x40, %ecx > + ja .Liter > + sfence > + RET > +SYM_FUNC_END(clear_pages_clzero) > +EXPORT_SYMBOL_GPL(clear_pages_clzero) -- ankur