From nobody Thu Oct 2 03:32:46 2025 Received: from BL0PR03CU003.outbound.protection.outlook.com (mail-eastusazon11012049.outbound.protection.outlook.com [52.101.53.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 384E1189 for ; Tue, 23 Sep 2025 17:48:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.53.49 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758649737; cv=fail; b=QEORNexmQb3tw/h8V/y3TGyhD4IXK/5zh1brnm83GsdGD15qVVGaoKlcWFCirTTKdZC28MnmvIWZzmrbXtRcuIQ1ZvK6FoIZ1SL9TzKDn8tD3mEuCKJaM+ziyimolqZI2ypDdWRsnakpEocH7AUQ/m7brQlyWvsltvTm0Q25DAk= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758649737; c=relaxed/simple; bh=q85A8m++X7UCkOmg/9rSaiyLUssj1Fj/XBNDBAms4H4=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=I4ZFZ24SGlzpNFnJhw6GnCE4wu8iEcRPt/gOJ0UyCsRDUulIfQc6nbJ3x5zQvdhCkjO6tFE89onYY2irFeeeKT1XRQlOkjwTd0fZvlhcijYPU7qPE9BTI29qAfDhuraelkTaZDYDoKR91LE0ZstCjMOg+IzexHuJGIkLK24uYRY= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=N7zs602E; arc=fail smtp.client-ip=52.101.53.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="N7zs602E" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=ichqhSRUk/9jgrTaaO+EsSETkHxI4I0ekmQTFLO5KfLHPX0A3QszGQ59hDqnUK0utyrqJMcj9UC+0RktqgdnspCi3tkrKeZ+Rl/TS4mJzLsi3PpXgIxNU74FkZIxal9pmxcSrDiFTAKXBch9jL1+I6FoTL0fUCfNvrUcY9BRjgPj6HO6coQND/AMEAFBRHKjUglpRaGqVLSXx3mY7RngGkACRWQydTprP3h4ASKLjHYvTdBJGP0lCDUkfFbQdRDtKyDKjxgNn+e7QuunFQePKpBge7hoekg9hUmx3RA4le0e0cBPyv3gUDqNqtByOhSNGoBL0fut/wd6vitAywl/dg== 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=juCl6Q7IDVVaEwDIPOfsLFRmleBkegBnFU+fvOlhQWI=; b=LGkWTB6hE6bbBz5WH/wg7U7iN9zHbf01LyVV6Yj6c8u++flgNsxpddUDUxzEu5b2+Sn0hYGEXeMqKlwIzYfQNmeSXkreVnFUTFY4qTBlAM9qtBYNpurRlvGn/b5PE73oNOxILKT28mO3d3VUoWEN5n/fW+UmeVLHhCx+p1se4aQTNz5CaedmLW0XzStSnuxMpdzHhIdt/RUorNi9uz2nyzMUc3NF2fcPi+MjmDkUVqTWGuB85goA9LBlG/FdjWNd74lMfI3GHy3HZgSx1AeJURyj6r59iI7566QhrR6bB1sfr8I3NoKUi6TOQ/GuqTod8k6zHB9fnen8zbPHMYDaIA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=linux-foundation.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) 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=juCl6Q7IDVVaEwDIPOfsLFRmleBkegBnFU+fvOlhQWI=; b=N7zs602EzuuGAFYsykzECl0u7WOQ3fR9RqfAKqDWKrGIct/wKmUeMQHIwLXJoVRpLaMgiQTh8q+0ugcukAtixdS308kI3VB6QH4nzzhQI0RHmi7Al1PwPbQNEKeYAKFfMJt8d4WeS6noa+VK2GtJD/pLbRpYUBVwoqA4rCCpsnY= Received: from BN0PR04CA0200.namprd04.prod.outlook.com (2603:10b6:408:e9::25) by MW4PR12MB7120.namprd12.prod.outlook.com (2603:10b6:303:222::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9137.19; Tue, 23 Sep 2025 17:48:49 +0000 Received: from MN1PEPF0000F0E4.namprd04.prod.outlook.com (2603:10b6:408:e9:cafe::9a) by BN0PR04CA0200.outlook.office365.com (2603:10b6:408:e9::25) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9137.21 via Frontend Transport; Tue, 23 Sep 2025 17:48:47 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by MN1PEPF0000F0E4.mail.protection.outlook.com (10.167.242.42) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9137.12 via Frontend Transport; Tue, 23 Sep 2025 17:48:47 +0000 Received: from kaveri.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Tue, 23 Sep 2025 10:48:38 -0700 From: Shivank Garg To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC V3 2/9] mm/migrate: revive MIGRATE_NO_COPY in migrate_mode Date: Tue, 23 Sep 2025 17:47:37 +0000 Message-ID: <20250923174752.35701-3-shivankg@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250923174752.35701-1-shivankg@amd.com> References: <20250923174752.35701-1-shivankg@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0E4:EE_|MW4PR12MB7120:EE_ X-MS-Office365-Filtering-Correlation-Id: f9018db0-0233-4c05-ad8d-08ddfac972bc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|82310400026|36860700013|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?kYDyYId8ciugnAHuyfe+TRfbG2RWK8Hj/BCha2RFo6vjZpRD/9NLvGo1lCJ6?= =?us-ascii?Q?PcobJtxMKRYb4o1Ng7ZiC/rXwlef+K//3+P5Z6/HjDhzow/IdV/smfOvn/tE?= =?us-ascii?Q?8xCqyll/K8j2wVDDTnACOlv51fNVJTI3/S3aePvUOIrPVG5ckENjVHVzuIr1?= =?us-ascii?Q?kgiimBYMyBpgUIUhW/vGQQAeAE1qFNCZLmpUEW280QGzkYFo0SSSDFFxf2rT?= =?us-ascii?Q?H2iWfEUVA5/Bi9t4Ycov3Q55uaiXUkGMxjTFzL9iZSigzWTwu6slYl3IpDnT?= =?us-ascii?Q?cqh50bP++fH1LfMDF2kT2R+m6tL82MWNfwlF2N4xJb673rZlEA9c13mTiUDQ?= =?us-ascii?Q?NRJQCdcnTi+1GB8a6rdI6AvmChvK35MLtaCMz7d/zh6r328g2MOreTVcvotb?= =?us-ascii?Q?9tnxEyuWPybDvREDSvshX3IcYzIUFScPYpxMyuSXz89/RPLOz/VgxT4Dlibk?= =?us-ascii?Q?QSMLWSkZBEOh8P8XB8YV4myZ/8SjNhCa8hlr9IRFKfZ68YGhD9+ecRW26dJ1?= =?us-ascii?Q?Y1n4VZ15HfLYQVw8VQZfBV5WKF+s27BanofHRUfwusJlFwsLgIfgR+R9l97g?= =?us-ascii?Q?9JFNS/IBR4m25BffNlYlF076RqcsCWFlwYtL8O/5AkBiFTRujdl5ecWnrs2L?= =?us-ascii?Q?hxjh/KVNVcs7SNLbt9GhGaFelWDL4TV9RBTgi5I76VzRiFaI5ErrQBrIZLXV?= =?us-ascii?Q?h3pQQ9S7J4mQNGjxVv7MJFhCbLNpdaW6riEDwwf0107hFRrtu+1j3ScrclDc?= =?us-ascii?Q?35w+9qaxtsye7vTIVPHNBlK6mIFMZBGKzy3mw4DbRzel/cYwi9kBdgBWZNN2?= =?us-ascii?Q?4D44g/LTUGI3359us0yooQu9lGyxzvcppwR0Nyg5x6gUYGWyzpgPIJFngwI+?= =?us-ascii?Q?OlW1LwX3I6wgs62qeG06VOK+WLaN/mg3EqGsA9w0Li/Isl0/fLWeAGpdu+9+?= =?us-ascii?Q?GuD0e09lVTlYl6FSqgLzQzhe34EaNqlb+B/G2Bj1saM3Bt5T43MXSGZr4SGb?= =?us-ascii?Q?irtgNBQ28IJbH9RmOMJ4dN0jVGyZ1gYOG7A4H6zlHluNiOTv24o71T6HrqNS?= =?us-ascii?Q?a0q08lrAIDQ3t1xuixSE2AKmbhM68v9vVI2G3WAhI1ibVo7L1S9zcplw5im2?= =?us-ascii?Q?lWqg5uvw4VqXlgASFxZkZ7hPzeSnOVVRw3jGToOUHuLtTE0Yva3+aoQviBcA?= =?us-ascii?Q?k5WcjNLohfQmwciOih+YqDLDhZGB/X00J8BXaQarRoFQy/lComgcfMDUy9ig?= =?us-ascii?Q?2SNzswggzF3JAG5b9SyBaPF9BJ2OuQcPWPuQBs3oGmhZvqFllNmWKr9mfmBj?= =?us-ascii?Q?XDm7W6B/FhLAUfJ2hACodwfFZnoPxxbTY9rg/TNTKCIzMqlBUU/OYqrqf8NZ?= =?us-ascii?Q?q65CyxnIKBnlDLTDHdvruAPqVQOszyKd0xGwuBURRQ+aoZ5NYTr9gRkXA4Yd?= =?us-ascii?Q?XL/TzJDOo/eySCsQP94+SO0qGxdd3SCgZ3vwhlVOvwiuuO79ORtF+uCCgmrS?= =?us-ascii?Q?XPKG4cOp6U61ck3eBuOli9nunLM+VWrlmc88?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(82310400026)(36860700013)(376014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2025 17:48:47.6388 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f9018db0-0233-4c05-ad8d-08ddfac972bc X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E4.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7120 Content-Type: text/plain; charset="utf-8" From: Zi Yan It is a preparation patch. The added MIGRATE_NO_COPY will be used by the following patches to implement batched page copy functions by skipping folio copy process in __migrate_folio() and copying folios in one shot at the end. Signed-off-by: Zi Yan Signed-off-by: Shivank Garg --- include/linux/migrate_mode.h | 2 ++ mm/migrate.c | 8 +++++--- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/linux/migrate_mode.h b/include/linux/migrate_mode.h index 265c4328b36a..9af6c949a057 100644 --- a/include/linux/migrate_mode.h +++ b/include/linux/migrate_mode.h @@ -7,11 +7,13 @@ * on most operations but not ->writepage as the potential stall time * is too significant * MIGRATE_SYNC will block when migrating pages + * MIGRATE_NO_COPY will not copy page content */ enum migrate_mode { MIGRATE_ASYNC, MIGRATE_SYNC_LIGHT, MIGRATE_SYNC, + MIGRATE_NO_COPY, }; =20 enum migrate_reason { diff --git a/mm/migrate.c b/mm/migrate.c index ad03e7257847..3fe78ecb146a 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -848,9 +848,11 @@ static int __migrate_folio(struct address_space *mappi= ng, struct folio *dst, if (folio_ref_count(src) !=3D expected_count) return -EAGAIN; =20 - rc =3D folio_mc_copy(dst, src); - if (unlikely(rc)) - return rc; + if (mode !=3D MIGRATE_NO_COPY) { + rc =3D folio_mc_copy(dst, src); + if (unlikely(rc)) + return rc; + } =20 rc =3D __folio_migrate_mapping(mapping, dst, src, expected_count); if (rc !=3D MIGRATEPAGE_SUCCESS) --=20 2.43.0