From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM04-DM6-obe.outbound.protection.outlook.com (mail-dm6nam04on2056.outbound.protection.outlook.com [40.107.102.56]) (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 B746E275B16 for ; Thu, 21 Aug 2025 15:24:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.102.56 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755789898; cv=fail; b=oqSW7ngwoc55vZPw/Xfug7tWj2JIb+IovJO22VJmxACr4k6AzgxL2HPaaQRwVeXB2TB+vXiG/zWEs19hnIECYwe+OPxuWN0nhFS8oJLzv2wJ3UX1WAoMTHdrTJEA+/mMKpjufZ9tbEBdn+H71Z40OnDfBDAci5FQVxDzmGMo7vQ= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755789898; c=relaxed/simple; bh=mLUmE+ZwUOrvDBrrsSoWn5410toAqLHmgx2Q4urraSM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=M+OFkaOB/DzhKhkIEHWT1ft0N7ecbesFUq+9oDiG4lRMXQvEQsQ7qCsb30qvp0iTNQEmXGlm/u+x1WMnhD8/agTAE2A5xNvEeT8zK2g2Ss48zHZWQw0c1sB5ACDi3NskTR+19Rita48q3Ycqt2lEVqVu81PZXmU10qWnZAR1q3A= 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=arZNgstq; arc=fail smtp.client-ip=40.107.102.56 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="arZNgstq" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=vXjRr1zQKxMEhhYQO+qT5TUJaVsTT72u0t/f5n/e3JNp/EFa1thf4iaqsHwlkNgo8mcoHpUI+WB4M5dTUTUzczKplR3wOkzU6M6mlTfbs4bRde5Fadev3EB3+4F2CQSd/Mv7Gp3mxDC6orN+jk+1mykksIAMBhF/EoMNqN/lut6QKzdO0OFBUJwcjOu7EqWPB1rjaNLr53eNF75ZBZ8aTzMFUSYGZ/7VI3vvsnvRGWJknmgEYRi8WjyBU0xAb96U9UdEDG5rEmDE9HR2B3chh6SkDJywO7qYiNO2Iy5ivHfSB+R+obCMOCEcSWOUUAeFyG7O98/5nqKlA8Rg+KuvmQ== 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=eRQyD8s572zAl9nNsQBha/CgSlFdHU1P1iWMmgEsTNk=; b=SxR5N1STX+qjyWUaDG9zMQpRA5RHUH2x7uEEqLMDGaqQLwA7+PjNc2lEJZC12ed1ZkgHSccjb2IRNQMMr0RtOi8yGUvaS5t5hdTQzS9fktLIjbTIau7WdvDrx+JxeHX2FlkxGcTVI/TzMijKnC1d7jq1jGSHZcmiT6uwigyXc7FF6eull98DTFbPuKdCEZbrxYZvySAWFKuyoBcxbATD5Z1XOrWHi1zvk6GOqqHZDrcyuLcMb/e0yhJSIcMycvsOfzJGgrsOVcYVn/OuoKGO10ui2+G5q71qvMWulLLQhgCk3h6piEbVAUweww/gVOdCeOkcnKjNXQ2j2QPuS2AmZg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=arm.com 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=eRQyD8s572zAl9nNsQBha/CgSlFdHU1P1iWMmgEsTNk=; b=arZNgstq4Xjz5eyRwMTqMc2aLvchkOpmaElhmrL4ThAyNXh6h6A5d5mAl8/BAspn3wWWSW9GGQssYnCOf/QjL1fISzJrMx+UrMEkiuceCuXhK5r8bo8mhXsJh7M/WLBSuGSX2H6jxTEVl03q5Xt5vF/g7sMacvm0Bzc0kfnSQV8= Received: from SJ0PR03CA0088.namprd03.prod.outlook.com (2603:10b6:a03:331::33) by MW4PR12MB6732.namprd12.prod.outlook.com (2603:10b6:303:1ea::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9031.25; Thu, 21 Aug 2025 15:24:50 +0000 Received: from SJ1PEPF00001CE4.namprd03.prod.outlook.com (2603:10b6:a03:331:cafe::f6) by SJ0PR03CA0088.outlook.office365.com (2603:10b6:a03:331::33) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9052.16 via Frontend Transport; Thu, 21 Aug 2025 15:24:50 +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=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SJ1PEPF00001CE4.mail.protection.outlook.com (10.167.242.20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.9052.8 via Frontend Transport; Thu, 21 Aug 2025 15:24:50 +0000 Received: from tunga.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Thu, 21 Aug 2025 10:24:38 -0500 From: Raghavendra K T To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH V3 00/17] mm: slowtier page promotion based on PTE A bit Date: Thu, 21 Aug 2025 15:24:25 +0000 Message-ID: <20250821152425.1600861-1-raghavendra.kt@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250814153307.1553061-1-raghavendra.kt@amd.com> References: <20250814153307.1553061-1-raghavendra.kt@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: 8bit Content-Type: text/plain X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00001CE4:EE_|MW4PR12MB6732:EE_ X-MS-Office365-Filtering-Correlation-Id: 04e0f62d-08ca-404a-cd47-08dde0c6df0b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|7416014|36860700013|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?PBLJY8Xf31x7OGTrFMmmhdxX+uIeC/Ho6IRU+cy8hi2OUshY6NdDA4daNwhK?= =?us-ascii?Q?v4m+eZSHutV3VnKC2FDwk/HtrJVuoPQohKbSGQIquZ26pqvpTI/n9BRYVFUK?= =?us-ascii?Q?H2Mpp10/JmIB/ywlffhkzanu7DhgAaoaImypicUatbHRcHCRbkV6ZfjAulPa?= =?us-ascii?Q?W0sc+u3j8++3Oz1m0XrjM0Nf2koiLgj0scvRMoruBQwU89XQr9EytxJfyjSn?= =?us-ascii?Q?3xi07X6+8ImUoORMeK41RvnR7v1uKRbLkCr/bd/8TRIExTYh5sy32XT0Awvi?= =?us-ascii?Q?T75lAxCcMS6u2WX/Ys6ZKKXAZ2PPNyIsNJz9R4PZNsm/1BEY5bOgo5KS5L6m?= =?us-ascii?Q?BCAweIlaggpsYKI/ssUKg4ySjgGW93xEGMT5kfxgqyCFN1pyQFBKUz1QFDjQ?= =?us-ascii?Q?5RWRHsysV3QzbdtGP8B3azE4X3e/bSf0I977NiGqiabzzoylljHwpNm4hC9w?= =?us-ascii?Q?dGiRToz0nhUFzilRDsf8370cdhIUvOdio/rvAvDBzdIgoBo2LutfyO79CEd4?= =?us-ascii?Q?6OnW7TydLUf0L8w6GaYOG9HIRWQ2UqNaiANf5tfOQW+K82UZP+ThHyCfjYgO?= =?us-ascii?Q?12AKwIArhXcMPs0cAM/gjvaciARQ/SL8YVqTRvzaLRuCAvQcddMwKD7zPQ6J?= =?us-ascii?Q?BuTcjcPjuxyOEm07t6bzAGli5NaObBEKe6vbmWu+aJgEPvrtUsRECBaPkdyt?= =?us-ascii?Q?CmoyFBiCP2PhMefX+q6OJ2h6TQ6wCPXJTcok9tVKaL3cB1rr36qRisxdKuHR?= =?us-ascii?Q?f4HgNb+pljWUabR3HJn3k6fyN/Mb7aqSRHHM9FP1Fd++ba/mzjf6347UC1TT?= =?us-ascii?Q?hmql1KqCLbMD22/6MXMQXIM0mJn9yIsKMAL9oucvLadNKjukAAlfe1imOXOE?= =?us-ascii?Q?WV6MqSFOa+yU6snahzd2bXWyzCjWuw/IXnHHqMQqShLvLk9KeKD022Gh7xNR?= =?us-ascii?Q?AvyQoUpeJBULAOQsdPJqtSuOWtk1E/QQ+7HaZXfb6xivZjwnqOBILK2UR8an?= =?us-ascii?Q?vWyCRMRLfviTXgC0oN45vMOiroyEI6NgwuuHZjZzhIYvUEpvqL5z3BQiMDXP?= =?us-ascii?Q?9V/txfl8jZ8AgbjgPpAtizWhm4p+hkE7O8gGnhTLiSZR0fKY+RUq7Jk5o1yE?= =?us-ascii?Q?2i+6GNhcx+lSsw2Vi3d4EgzW+zc55uYunhmgSMhAQbvGeWUyFCoTzJKcfvyN?= =?us-ascii?Q?96XCw7FRL6y/8IpO4X7C9lxiIyRZh/5TUlfT/6lz7qn8BazZdBPPyyiNx1RC?= =?us-ascii?Q?ZYPFI+CoCFyLVBlqPSu/XBuj7As81VOOXMa9weu7IOE9b4Zn0o/ayuW78U0m?= =?us-ascii?Q?RC5ukJZ47+mimE88TODykL/FBwYamcZYVPiNMMF5heJYXVeFOcoFb7Imx16B?= =?us-ascii?Q?dhyIhUK64zhRBPyv2/jGgv3xrLBoEhwsFppKVlfZ0O1fxRx7UCxdzmALopqe?= =?us-ascii?Q?haB9HSJbUN/HBU5rN1whHa0SWRT4gzpnsBQs/hWfhbfMhUf3BYWOJLXjU5HV?= =?us-ascii?Q?uadAc9JZsXjCD4SfVeW7IVOpvz9C3DMGe6o4b7VVUsijvisR4ZYIoEjC5A?= =?us-ascii?Q?=3D=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(7416014)(36860700013)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Aug 2025 15:24:50.5365 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 04e0f62d-08ca-404a-cd47-08dde0c6df0b 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CE4.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6732 On 8/14/2025 9:02 PM, Raghavendra K T wrote: > The current series has additional enhancements and comments' incorporation on top of > RFC V2. > > This is an additional source of hot page generator to NUMAB, IBS [4], KMGLRUD [5]. > > Introduction: > ============= > In the current hot page promotion, all the activities including the > process address space scanning, NUMA hint fault handling and page > migration is performed in the process context. i.e., scanning overhead is > borne by applications. > > This RFC V2 patch series does slow-tier page promotion by using PTE Accessed > bit scanning. Scanning is done by a global kernel thread which routinely > scans all the processes' address spaces and checks for accesses by reading > the PTE A bit. > > A separate migration thread migrates/promotes the pages to the top-tier > node based on a simple heuristic that uses top-tier scan/access information > of the mm. > > Additionally based on the feedback, a prctl knob with a scalar value is > provided to control per task scanning. Patches are also available in the branch: https://github.com/AMDESE/linux-mm/tree/rkt/kscand_rfc_v3 [...] > > > base-commit: 038d61fd642278bab63ee8ef722c50d10ab01e8f