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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3A151C02192 for ; Wed, 5 Feb 2025 06:24:30 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 793C96B0088; Wed, 5 Feb 2025 01:24:29 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 742AD6B0089; Wed, 5 Feb 2025 01:24:29 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 549236B008A; Wed, 5 Feb 2025 01:24:29 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 319716B0088 for ; Wed, 5 Feb 2025 01:24:29 -0500 (EST) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id A70498065C for ; Wed, 5 Feb 2025 06:24:28 +0000 (UTC) X-FDA: 83084901816.20.5C2A320 Received: from NAM02-SN1-obe.outbound.protection.outlook.com (mail-sn1nam02on2046.outbound.protection.outlook.com [40.107.96.46]) by imf27.hostedemail.com (Postfix) with ESMTP id B03ED40004 for ; Wed, 5 Feb 2025 06:24:25 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=Jb0jJuap; spf=pass (imf27.hostedemail.com: domain of bharata@amd.com designates 40.107.96.46 as permitted sender) smtp.mailfrom=bharata@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=1738736666; 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=P3E2HEYPGTxZlN0XoIWltePQt/XHuTqrjM9TyenT6q0=; b=NZeDmSNvBbCZFlprH1z+TqN+jSq0tz4QKuVwapSFRC72WrPkpobm85vDVGRdxgzUKELvwI xs7pz/67yxduqYaz/6Wq3PBlXZZ5KJkdT0Ji4rRxHmPDM6d6tDstl+f6PV2bgs7fempAWB 8jyTQ2VC73XQNHmefbCyd3IG39oK4DM= ARC-Authentication-Results: i=2; imf27.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=Jb0jJuap; spf=pass (imf27.hostedemail.com: domain of bharata@amd.com designates 40.107.96.46 as permitted sender) smtp.mailfrom=bharata@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=1738736666; a=rsa-sha256; cv=pass; b=SbRkZNI3t2jCEv8g6g6l2FJ55DpFvoOCqCyy8Yg8Ox3uSsv07FB1MMdMupiDFvpOQ41i7M jSKMivv7uyUl4rvdPG7pxVaqPsVujmJnLGvWsoMcu2ukxGJFF8/qWxlpgUgllb87ew0gdi mOFhXVPodMcIYRaSV0sGP9WLdqJpFOI= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=MrVSriJOHH2ZkeUaA/vYy5zSnnqq+JYh3RJu1oLEGs5IW2ogKAVl70GgXpCkVnFIJpgklGcaJ/TUYVWjYvi6PU02TPlpNm87qxt2FLIqFGMUZJZbZiorH3I6e7mtRuYFqyBKcV4W+qHxzQ2VaXho87hkhCrj2GMjg9xDfW0kN5gA2nheeu+iXf5e0/HGT+hWWMuLa/R0iAcqCMx1mW0KbCRVuO2erfbKzy5B+tywSjRGfQOPUryfj3P5I7Z+tzo8PySOVdXsj/pbBTFbgP4ZPIrKWuUlQDqbEB1PV+Sd1fR7IJa5SELv0+DFZ3M3AZbwzJjPClh5Q1bum5semKipLw== 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=P3E2HEYPGTxZlN0XoIWltePQt/XHuTqrjM9TyenT6q0=; b=Du2DTPvLM6lT9qE6r9LEPwXfrFXHDfEWs6DY2TzI4z612+Ujbtogu+lm7AOq4qIzrW4o/JAyT7Q85ox2TEunOB9g389g+unYEw1V6AzMab7tRuE8leVGUWgfqjsH2/NUy4IRB43CqiC5VPobRGkLJEXizDdi9odiHphCVsdkQV4YnglcharelTtRKgKedG0n7R6KyEV4Sdm/OXQVrIWvRKS1Njl4evXxypSQMYrIZPhmV02ft5GpmjYgli/YlwwlBrhYjXAeMA4t6UImd3nmL1hwklGjbJe5h8+HO7t8cVuxaqxxoYzlqQo/7HZGskEtsTPP9tWR28jTkvNyxI99IA== 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=P3E2HEYPGTxZlN0XoIWltePQt/XHuTqrjM9TyenT6q0=; b=Jb0jJuapI5E/0ciMxeri8a72fIelox3Zpophh98K7DSBVnbsLwUoyEyxsQWkePMBjn/Fl/XRUHpc5A/BM/o5dmekq1FxcljmeRgtiGjS9YVq0FnbS3P13tfG86BfyNH8hSLJiDNDJym8TPKIJIfu7nY84PY7kf6nt//lVM2sUO8= Received: from IA1PR12MB6434.namprd12.prod.outlook.com (2603:10b6:208:3ae::10) by BL3PR12MB6594.namprd12.prod.outlook.com (2603:10b6:208:38d::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8422.11; Wed, 5 Feb 2025 06:24:21 +0000 Received: from IA1PR12MB6434.namprd12.prod.outlook.com ([fe80::dbf7:e40c:4ae9:8134]) by IA1PR12MB6434.namprd12.prod.outlook.com ([fe80::dbf7:e40c:4ae9:8134%7]) with mapi id 15.20.8398.025; Wed, 5 Feb 2025 06:24:21 +0000 Message-ID: Date: Wed, 5 Feb 2025 11:54:05 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] Unifying sources of page temperature information - what info is actually wanted? To: Jonathan Cameron , Raghavendra K T Cc: linux-mm@kvack.org, akpm@linux-foundation.org, lsf-pc@lists.linux-foundation.org, gourry@gourry.net, nehagholkar@meta.com, abhishekd@meta.com, ying.huang@linux.alibaba.com, nphamcs@gmail.com, hannes@cmpxchg.org, feng.tang@intel.com, kbusch@meta.com, Hasan.Maruf@amd.com, sj@kernel.org, david@redhat.com, willy@infradead.org, k.shutemov@gmail.com, mgorman@techsingularity.net, vbabka@suse.cz, hughd@google.com, rientjes@google.com, shy828301@gmail.com, liam.howlett@oracle.com, peterz@infradead.org, mingo@redhat.com, nadav.amit@gmail.com, shivankg@amd.com, ziy@nvidia.com, jhubbard@nvidia.com, AneeshKumar.KizhakeVeetil@arm.com, linux-kernel@vger.kernel.org, jon.grimm@amd.com, santosh.shukla@amd.com, Michael.Day@amd.com, riel@surriel.com, weixugc@google.com, leesuyeon0506@gmail.com, honggyu.kim@sk.com, leillc@google.com, kmanaouil.dev@gmail.com, rppt@kernel.org, dave.hansen@intel.com References: <20250123105721.424117-1-raghavendra.kt@amd.com> <20250131122803.000031aa@huawei.com> <20250131130901.00000dd1@huawei.com> Content-Language: en-US From: Bharata B Rao In-Reply-To: <20250131130901.00000dd1@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: PN3PR01CA0031.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:97::20) To IA1PR12MB6434.namprd12.prod.outlook.com (2603:10b6:208:3ae::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR12MB6434:EE_|BL3PR12MB6594:EE_ X-MS-Office365-Filtering-Correlation-Id: 3a8a1822-eda7-4f30-43b5-08dd45adb9e1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?VGNKVWZ2V0JsTUgvWFk0SjZlVVdsYVZyY2NmSEgvUDU1MVVENzdsTmpEK3k0?= =?utf-8?B?amdxb25LekJ2c1Q2M2NIc1VLN3FLUUxKa3l2UzlWdmJCZ1Z3RVc0VDE0STVC?= =?utf-8?B?cUhZcTQ3S3Z2SHRMTGJLRXdGM20zMUVUNU92SCtQTlVnSVRER1Z0cjNuWklK?= =?utf-8?B?WG5OcGpGdHpTYTFGU3ZlZXdXU00vUytKdExHZTdKVi8vVE1XMTJsQ0M2dmdE?= =?utf-8?B?NWc5ZG1uQXVuNnFYVnowVS8vWFpiWGxscHEydWhIVWpSNW84Wnl0UStneTlo?= =?utf-8?B?OXh3VmZUVFNJMklITitzVEhLeUFrL1BXbHdURmpaWjdBamVxSCtxcHpkdlls?= =?utf-8?B?MEVRWUFOMVhlUncyOVhxMWNmR0NxSTdEaFZFb3pHUzVqb2h4RXltSHIya1I2?= =?utf-8?B?Q2ZPZTdPOUdWSkVWRnczOGNWa3ZLYWVUNlNSdEpZNDVUQU5vdDBNY3V0WmtS?= =?utf-8?B?NVBSNzJSVmg5b1NSbW5QdlNlSDhycVU2RlZBdkJmZ1N3d0o3dDF4SCtGNm9z?= =?utf-8?B?enpsN1pWTk8rOWg5YW9HaHlkOUl3TVBQcldGWDNGMlRuU0xBbzFiajJBQW5Y?= =?utf-8?B?R2REdGd6MVMzYkJkZFhPRnRpckk0UEpTOGIyQnp6OGlBd0xtc2F6endtY3B0?= =?utf-8?B?Z0RqRzd1UHdJQWFBYjFTTER4ejhsd3lwWXNhbGF4czRjTjN1SXArL2kya092?= =?utf-8?B?anM4c1ZWZmlObk5BVXl5eHBTcGE1bGQ0b2lUditQOW1CdXdtclZhZ2I2L1RR?= =?utf-8?B?VndDUlR6Z3dIL1FsTlBkcW0yQXVKTUxXN0JxWTQzWWVBZ2Fib1F3bzV2cmpL?= =?utf-8?B?SkRDZkZScUhrcTJTQnNrTjdCNVlNQ05yNk5zZ2IzWEQvT0Q2UVVuL2VmMGs0?= =?utf-8?B?UC9DSEI0TDlBMkhGU3FCYW4zUDc5RGpmUU1KV0FFZlozd1hxT1E0OER0SS9S?= =?utf-8?B?YThvMkJPemZQbXE0YTFQcERPM3pzNnhFSnRDckVUWTdvMDRySUlsNitOc2p5?= =?utf-8?B?REdsRHBiczU0NmlRWjU0OWhVQ1VEK0tmV25sbllnRWtFRFZVYWtGOWd3cFJO?= =?utf-8?B?azRrRkhUMDdUUitIaGtjOHFzb1kyd1UxZ1lYQjNIMmNaMTdybSthNmJocjhE?= =?utf-8?B?U2M2VkZqSFJEays5OGp4TlZ0RE9XdUZkdTExc1RGaFJqbW1oaXg3NkZza0dy?= =?utf-8?B?TTgvMmFtbWJrTjQ4NG9JTDFJZG1KYWpYdjBScG1EMzljOXpvY2wzbDlkaWJr?= =?utf-8?B?Nkt4WG1JUFdXb2RmSGZSNUlWVElEdVN3QWFFZjRqZjhrZnRUaS9GZmgyR3hS?= =?utf-8?B?WVhDanl4U2RFTGRrNHJ0NWdzaFFPOHpaazlHK25HNFpUKzh3ZmdramtQdm1x?= =?utf-8?B?UW1MWjdGa2JuaVhRSEhSQzRFSG9SYzNWZUVEd1FVajZEa2NzV3NmaGlpNDli?= =?utf-8?B?c1F1ZG5zU005d2wwRXNiY1BGYXRSOHByYVF1Sk9VYm11ZS9CdVZDamd5dGc2?= =?utf-8?B?ZWpPelZOZEtoY2ZjaU91ZU8wdldhSy92M3U4UklSVVQ1eWlneFJNQkRzZ1JQ?= =?utf-8?B?RXFMdmZtQUxtSmxjeWhJTldQZkdsOEpzSERCWGw2Z1FSaGRsZDhrajhrcU0v?= =?utf-8?B?dlJHeEtRUHBtajZZcW9mSTlXM0JNQzJvZ01RaVIwd1lBQmhlWWdOVzRsY210?= =?utf-8?B?RkMwd1N0Z2VsVDNVaXdVVTZyZUt2N21ySGIxWCswRkxEdUNxTmFNNTExKytz?= =?utf-8?B?ZXM2Sk1ZRE5JZld4QkFhZmFCaGFNamIrY29JaGIycFlLRjJPa3dBby8wSklj?= =?utf-8?B?WE9SZis2SXdhOGxxTUFDbHpPTEZiUDdBZlZOS1lwLzFvbkhOeVkyTFR5a1Q5?= =?utf-8?Q?FuNWgahff4fl/?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:IA1PR12MB6434.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(7416014)(376014)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?aktHVFNnSTdzbDJaMGpRU2FFWnZPMVpnSG8xQUt1OFFiT3dUalZ1MHZUSzdo?= =?utf-8?B?aTZlT0p3MDB4QzFINURkQkRIalpwc25OOCtUaUhYd3p2aTYyRm1vMWo3ekNV?= =?utf-8?B?cEVNeFN0MW9vbHdyTDlwYWV0SUxvbXg3aUkyOVlEZ2UzaTBYVWF3S0N3L0Y4?= =?utf-8?B?ZWJCVUF2NERxNlNBdjBKNjAyWitiR29aRW1YUzVxRXhWQ0w1M0w2N3BldnZG?= =?utf-8?B?d1hVYktCV0E4MEVZZ242eFZ0cnd3b25aZkhCUVFnOExKTlFCaW1hTUpxeVIr?= =?utf-8?B?UlRKUHkrMEZKY1pVMzRxVE5mUW5lalhrcHpLSkk2UER3ZE9QTU1vL0JicVc5?= =?utf-8?B?Nm5BL1ZBMXdQU28ySzBkbkxDWnFtRm9YT2tWY0sxUEpsM3JGdWN5RTFUZjFC?= =?utf-8?B?eGM1dGl2a0g2L2ZzdGxCOGJaZ3B2RHdoQzlIQUVYZVAreUIyTTV0WGNaQTIr?= =?utf-8?B?Zm1QVTZDWkhOakg3ZUtIUXo4dXdNNEp5ZEF5K09vdTRJV2FNWm5SR2tXL2Vh?= =?utf-8?B?bkpFVWlldWlzTW93enVTSWtIKzlNdGNQZExiQWpFN2JoK2c5Tk9PZE5Nd1R6?= =?utf-8?B?am42N0xIbjd4OTNnbFJueHllaDk1YnFIeEZ5aHNORHdWQlhLZmFENnkwNFli?= =?utf-8?B?TkQ0aGlsZkNaclBmTDVtSHNTUU53MEVUMmdjZzh2aWNnRHJyeUpCWWdScUo4?= =?utf-8?B?ZDQvanVON0h3ZU5sOEhJVDYzZW5kK2xuK21DM2wraDQvTEo2dUJ2ck4vanpa?= =?utf-8?B?VVExeVJQZlpKRnNyTnpGd2FYdjJCc0RYVVJsVWF0UzV2SUY5QkRWMFFqZnB2?= =?utf-8?B?RjF1cjNFZ2NuVmQ4R2J2czNIa1dycEo4UE5HcUM1ZlZMdk1zZEh5eTYyTlYx?= =?utf-8?B?UnM2T0YrMnpxQ0p5eTRtZGR2dzloOTg0MmZVUnFtN01hWHEzQTFmZCswdkNm?= =?utf-8?B?ZnFvdmF5cDhiTlg4M3pPSmZTYjltMVo1dmZCQkR3T1RRdE1Vb3JjTHdCTTVS?= =?utf-8?B?RmdIYUtWSkZnL2hGeHNHdUxkTml4TEh3NHE3NUhtbGhRUkxnWkFBSzR0WVVE?= =?utf-8?B?YkplK1JHa21WdExqNTgwVDhEdTJZdFVSMW45Zzd5QXdoNll5WHd5Q2tqT1V6?= =?utf-8?B?M0RCRzE3UHRPUncxelZOckYwVkFPYXFJNGt5Ui9QcUJTWmJBYzJnK3ptMG02?= =?utf-8?B?Szg5b2ovUHdoRWM5Mlc1MXBnRno3L0NtUFlyeXpIcjdJMU5uOVMwcCtEYXdG?= =?utf-8?B?NVplU0RtL0dRa0wwaGQ3Skxud3hQWmlsVnRvb0JwUmo0a1l6bXdoMGpsRERE?= =?utf-8?B?MHBab1ZjY3lJRVN5NEYreXM1SG1jRW54OTg4dXBWZlZzZkpGNUdDWUFWRk5J?= =?utf-8?B?U2hMYUVRRm9uMEVsY1lpWjh4c3pKZWtyMVNES2lYdFpPTjM4U2h1SW10ZXZR?= =?utf-8?B?UCtaQUpmbDNrMmtDUTF6MEM4akpza2E4UDU0d1lTRGd6RU12VURNVTQ3aWd1?= =?utf-8?B?a1ZQUTVOTDZNVWVDSlRGTHpsU3BLSGdVSVRZTWNuQkJyMXdlMzBqcWt2QVBW?= =?utf-8?B?SURKL2ZIdFk5d1VaRGdSZEtHM1VLZktaUkxrWjdDN21Ed2o3VUxPdU5zVTQy?= =?utf-8?B?VEJiZERZMFRJNnZTcUNDdFRRRENmSTJXYUdDSUFYaUF3WWoweGI0T1QvM1Jx?= =?utf-8?B?TGNndEw0d0NTMTlNMW4vc2d0ME9LNUMvL0ZYWDVwbWJGU2pQYkl6ZmlwZ2sz?= =?utf-8?B?QWZrWmJyaC9tZVVoOUUzS21VNFVuRW9XaXFhQjFwdXBBV3VGWXFyL2diUUpT?= =?utf-8?B?WGF6REEzYSt6V2piLzBFcDIxY1J4T0RZWFdiaDN6VStpWkJuZ0ZoRDc4SWFY?= =?utf-8?B?aWloWTNpK2h1WjNWQzNtUHh5Mk9LZEhjbmdlaktzNEQxVFJSc1pDWU9yelZv?= =?utf-8?B?MmgxVm1RWTdiem5zdi9PZjdUZkZ0NEhyQXBIMkJERmI4WFRjS3NpUVVYNm5o?= =?utf-8?B?V0p4ckErNlV3dkJsUXowbStoZlFSOElyaks2Y2tlelFLMUxnNmZmOVh5UXox?= =?utf-8?B?VXp6VGpYWThLRk1EdTdtZzhGNFZ4dUwvZTFMbjRzWlowd1dzOW9jWG15T1hk?= =?utf-8?Q?g9m2VCc40KuQLSSmViZwyUz5+?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3a8a1822-eda7-4f30-43b5-08dd45adb9e1 X-MS-Exchange-CrossTenant-AuthSource: IA1PR12MB6434.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Feb 2025 06:24:20.9848 (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: AJ1f+Lkg/vY6iVxG+dSMKqHz5l+ek89tdMEsIZlCpPsgwUBkK6m6uW619M8OgoN9LyhNC/9qJQDm/7wpJTnGDw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6594 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: B03ED40004 X-Stat-Signature: z1x9crrsac3iaxqmetywerg7jnzpmdtp X-Rspam-User: X-HE-Tag: 1738736665-741537 X-HE-Meta: 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 xn8W3IwN 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.112568, 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 31-Jan-25 6:39 PM, Jonathan Cameron wrote: > On Fri, 31 Jan 2025 12:28:03 +0000 > Jonathan Cameron wrote: > >>> Here is the list of potential discussion points: >> ... >> >>> 2. Possibility of maintaining single source of truth for page hotness that would >>> maintain hot page information from multiple sources and let other sub-systems >>> use that info. >> Hi, >> >> I was thinking of proposing a separate topic on a single source of hotness, >> but this question covers it so I'll add some thoughts here instead. >> I think we are very early, but sharing some experience and thoughts in a >> session may be useful. > > Thinking more on this over lunch, I think it is worth calling this out as a > potential session topic in it's own right rather than trying to find > time within other sessions. Hence the title change. > > I think a session would start with a brief listing of the temperature sources > we have and those on the horizon to motivate what we are unifying, then > discussion to focus on need for such a unification + requirements > (maybe with a straw man). Here is a compilation of available temperature sources and how the hot/access data is consumed by different subsystems: PA-Physical address available VA-Virtual address available AA-Access time available NA-accessing Node info available I have left the slot blank for those which I am not sure about. ================================================== Temperature PA VA AA NA source ================================================== PROT_NONE faults Y Y Y Y -------------------------------------------------- folio_mark_accessed() Y Y Y -------------------------------------------------- PTE A bit Y Y N N -------------------------------------------------- Platform hints Y Y Y Y (AMD IBS) -------------------------------------------------- Device hints Y (CXL HMU) ================================================== And here is an attempt to compile how different subsystems use the above data: ============================================================== Source Subsystem Consumption ============================================================== PROT_NONE faults NUMAB NUMAB=1 locality based via process pgtable balancing walk NUMAB=2 hot page promotion ============================================================== folio_mark_accessed() FS/filemap/GUP LRU list activation ============================================================== PTE A bit via Reclaim:LRU LRU list activation, rmap walk deactivation/demotion ============================================================== PTE A bit via Reclaim:MGLRU LRU list activation, rmap walk and process deactivation/demotion pgtable walk ============================================================== PTE A bit via DAMON LRU activation, rmap walk hot page promotion, demotion etc ============================================================== Platform hints NUMAB NUMAB=1 Locality based (AMD IBS) balancing and NUMAB=2 hot page promotion ============================================================== Device hints NUMAB NUMAB=2 hot page promotion ============================================================== The last two are listed as possibilities. Feel free to correct/clarify and add more. Regards, Bharata.