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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by CY4PEPF0000E9CF.mail.protection.outlook.com (10.167.241.134) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9723.19 via Frontend Transport; Tue, 24 Mar 2026 02:54:42 +0000 Received: from Satlexmb09.amd.com (10.181.42.218) 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; Mon, 23 Mar 2026 21:54:41 -0500 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb09.amd.com (10.181.42.218) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Mon, 23 Mar 2026 19:54:41 -0700 Received: from [10.136.39.136] (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.17 via Frontend Transport; Mon, 23 Mar 2026 21:54:39 -0500 Message-ID: <971e8dae-491b-48b7-8258-ce0d1a136d21@amd.com> Date: Tue, 24 Mar 2026 08:24:33 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [tip: sched/core] sched/topology: Compute sd_weight considering cpuset partitions To: "Chen, Yu C" CC: Peter Zijlstra , , , Shrikanth Hegde , Valentin Schneider , Dietmar Eggemann , , Nathan Chancellor References: <20260312044434.1974-2-kprateek.nayak@amd.com> <177382132440.1647592.1849180094328011054.tip-bot2@tip-bot2> <20260320235824.GA1176840@ax162> <60406550-d90e-4efa-a4d9-f901421887f8@intel.com> <470ce693-ee2e-414e-930b-d6581d649110@intel.com> <7fad91ea-e6cd-43c8-abe3-16d7843247ed@amd.com> <10204982-a007-4f44-ab12-bcddfe4140c8@amd.com> Content-Language: en-US From: K Prateek Nayak In-Reply-To: Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: MeLvzLaLAC42yhinrhf4FdX8juA2XNMiOVql50X2EDm3Bh31OQOtiRh6aklNxO6WmnwShANP4X2rf9lIOxuFqdbL8eoYEXS3NW0xx2HsR4RjxzoYepQozKnJxRUm01KaOUnjl1xy6WkFj93kEAWuzcT4LfywEfyrgRRrI/LgTXh4HciSkr7eTxnrO15WgYXoCLdU9su1LsTO5XQMBxQTMMXtkNXkkdl+IhVHcBHa23HiFUfUpJLKW09TEy3xSWIfnjBifNTuv4rRFXMeAsYLlD4xIBtu36z4KL19JljowKOYQplNx8R4B0mGN1N/UO4fWg4u6+arY1TgNx0dEL8FdZKigDGoBuRkmCWftcDZs5qxZ1E3r1We0yUA+8T6fqsNmJnczbaJDvXNM1VuCo+lDodI2mM9Cn9ua1AcE9+TI9bTrPM3V8FKrLFSidq8LQ4X X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Mar 2026 02:54:42.1471 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4d344d00-af38-44f9-e73d-08de8950b2bd 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: CY4PEPF0000E9CF.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4175 Hello Chenyu, On 3/21/2026 6:18 PM, Chen, Yu C wrote: >> And more evidence - by default we have: >> >>    sched_domain size: 296 >>    offset of sd_span: 292 >> >> sizeof() seems to account some sort of 4-byte padding for the struct which >> pushes the offset of sd->span into the struct size. >> > > In your disassembly for *sd = {...} > > mov     r2, #296 > mov     r0, fp > mov     r1, #0 > ... > bl memset  <-- oops! Ah! I was not able to see this correctly on Saturday. Thank you for pointing it out. -- Thanks and Regards, Prateek