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Wed, 18 Feb 2026 15:11:37 +0000 Message-ID: <74404bc5-0fa7-4ecf-b810-e29e1d5fbcce@intel.com> Date: Wed, 18 Feb 2026 23:11:20 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 04/21] sched/cache: Make LLC id continuous To: K Prateek Nayak CC: Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Madadi Vineeth Reddy , "Hillf Danton" , Shrikanth Hegde , "Jianyong Wu" , Yangyu Chen , Tingyin Duan , Vern Hao , Vern Hao , Len Brown , Aubrey Li , Zhao Liu , Chen Yu , Adam Li , Aaron Lu , Tim Chen , Josh Don , Gavin Guo , Qais Yousef , Libo Chen , , Tim Chen , "Peter Zijlstra" , "Gautham R . Shenoy" , Vincent Guittot , "Ingo Molnar" References: <60a05a3f50d14a7bf3b968f62cca87893c5c552c.1770760558.git.tim.c.chen@linux.intel.com> <79755f7d-cc68-4189-b6d8-850378e54017@amd.com> <95923e36-4117-4209-97aa-a92b60f2bd49@intel.com> <6a73ac0d-1fc9-49a7-87a2-65951ab2c844@amd.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <6a73ac0d-1fc9-49a7-87a2-65951ab2c844@amd.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SG2PR02CA0127.apcprd02.prod.outlook.com (2603:1096:4:188::7) To DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB6020:EE_|CY5PR11MB6187:EE_ X-MS-Office365-Filtering-Correlation-Id: 0021d85f-a3b1-482b-4845-08de6f0002dd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|366016; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bHVNQlIyNG5Xc0U5L2ZuT2NXa2tUSUlyby9KaXRqOXBCYTNtWDZSekczOGpR?= =?utf-8?B?WVFGMTNwdjBaT3o1ZnRrUGNjc3dzdUZzT083K1l6MFdPRUk5eVFCYUpCdGVI?= =?utf-8?B?ZWwvRjRRenphNGhseWdCWWhpQmlZa3ZIZTk4NTYvOWNVaW90ZzBwZkZmbmli?= =?utf-8?B?UksrZkJGb01FckU2WEpzVW1ZWHMzV2ZwZm9LclkxRlU2aDRsZWJ0aTgyQ3ZX?= =?utf-8?B?c0JoQ0dyY0FxYi83T21WdVVXSi9CMGk5NGpPNUY5UnNpMUFNUXcxWlRqSGt4?= =?utf-8?B?c3hRS1FCY1R0c0tHMDlSYTNoaFhVY0ROMnErSkwva3ZwSkZlQkdBaGp2UXNF?= =?utf-8?B?a3I3RzdiM1NjNmZmRWd5UVVJKzlKdmpNZjdjSG5JSVg4TGZpVFl4aVpERS9v?= =?utf-8?B?ZmZ5QTUzQmR3RGVZSkxYYkFYcE0vS3VFT3REb3N6TXRFdGlBMUkxeVAxKzMw?= =?utf-8?B?M001eWQydENjVHI5VFRESWlUK2tjZlh5cERFZTQyYVpEYmErZWhoT3NGWUxM?= =?utf-8?B?Znl5dEh3SnpUWTFJNlBDMCtQb2ZlV1crM01yNlY4bzI5OXlDbGpBWnp1SWFq?= =?utf-8?B?a1I0cmxzcStzNEdNbVhtVG5rdVNHL3EvdXJEVlhnNjViN29nKzY2ODlteUdw?= =?utf-8?B?eXpZWFA1VjBOcHFIMGRpdE4zdW5UVG51YkhrdGlDdDEzdmNVSDhJTWZkVGdO?= =?utf-8?B?Mmk5aFVZekFwN3lVVlRBMS9XVjZ0ZGtjcTA0b2pTRFdvRXV6UnhlbVlQU2h4?= =?utf-8?B?Yk5XcEl2VlQwMTh3UUFmNU1qRW9QOXdjQlQydmpldUNqbzFmQWp4TU9VcWx6?= =?utf-8?B?Wm5jVmUwakJGN05pbTVPSjZ3OEJDYVROVU5DUHM1WlE0dTlRU09OWnNIR2Jr?= =?utf-8?B?cjVJdlpVTUxYRVpVLzdQSnBFNWl3YzU3K2YrU0x6SGM3RlRsRTB2bjN5TXo3?= =?utf-8?B?QVNyaVFnVko1QmRpaUdPWm1sL1Zna1ZBejFjQkdFM1lLdkVQREloMzdqWmVK?= =?utf-8?B?V0luQkxhYkw1eUdCSkN6UVBNQVFRNVFlME5kcnpITU9DWGpwSUg5ZnNlcjY2?= =?utf-8?B?b3YrbGlhd2hSMjgyVVJmSFk3d0lpOFEyb08yZ2RRUzY2eHRhR3UrM3RvYyti?= =?utf-8?B?NGk5aHBLa281a1RQSGY1L3dFa3dVakZQa3VjRWVOM1JybXYwWGxnTmV1Ulo4?= =?utf-8?B?dUFYWWZ5NUtaWUExZXhKYnpBdWU2YXZLVW5tRjNDRk5icURjeWxlMUJQMWZn?= =?utf-8?B?cHphSEhqSjdjQURHR09ScU1HZVhTKzZZVVNQbyt1MlM1YjMxVU1QcVlEZEFC?= =?utf-8?B?WlRzVkU2YXB6UWsyTEcwWGpDWlNNRzloTlF5ZXpVSlJTT2taWHpSUW91QXBM?= =?utf-8?B?NDlCQ0NJTEtpZWNLc1cyZzhySFhDditWR0h3UVlDQzNEajNMaWhYSDBrYUxW?= =?utf-8?B?WUNDNXNpa0NBcmpxOGJnZUxyOVR5REV6ZjRiVmhrSGY1NjNObEVrVHZzcSta?= =?utf-8?B?aEJnZnNTL05Lb05IWTFGOTJiTExPQzJWd3VmWnBqZkRUbzZjUHB4NEkvcXk4?= =?utf-8?B?akloaG5JVG42ODE3VHlRL2FvZlVlT3ZNQm1mY0RuL3QyVTN0ZjBEK1JoMWUr?= =?utf-8?B?MUNZeWlTaS9kTWxsdHpXeXc5M09MTHlzYm85YWU4OWdqbEIrT0ZySEtjdG5P?= =?utf-8?B?QURLaTFXSTRETEZKS2NtOTB6cWtvUndPU09XYkpGL1pQeVprZkI4N21lSVRy?= =?utf-8?B?NlhjeG5RUStxMi9Ba0ZsVHRzZ1M4MUI2cmhBOVdMVWtmeUpCbVZ4VXNFNDNw?= =?utf-8?B?UVNoOEw0SHNkOVNVU1JvdkNtams4ZEY1djJraUs1eGhlalc2L1JEaUx4UzdB?= =?utf-8?B?c1Q3WGc2TGJ1SW1sb2lpYjY0dGQrOE9QbWNxTjVtZXdHdTlsTnpaaXUxZTdC?= =?utf-8?B?RGJoVHZua3gwcDMwTk9BZERSb1h5Tm1Vd21rSEgxMUlOMUMvSzZSWXg2L0RM?= =?utf-8?B?eGYvUS90M2lJU2dYTHJkSElIdTJOVFNwWmgxL0xvS1llYVJwYTIrN0dtdWpW?= =?utf-8?B?RWNtbnBFWGpQdm03TkhkM250RkNGZGNFWUhQeHJ5L1F1NnRVRGcxWXZrUGxq?= =?utf-8?B?U3hWK3hTem5NeFIyM3NvcUszdTg5SGxMeGZrYlIzUGZpQ3A1c2owcVQxdUhF?= =?utf-8?B?U2kyL21Xc0pnVG1MRHcrMXZGK1UwU2hWODlKdEdjTmY1TVRHaHJPZWZ6N1dG?= =?utf-8?B?NnZaMy9WK2c4Q29Ub3R2b2JBNTdXR1VHTWhZK3djVy9RbGRBS3BVZzh2RWxj?= =?utf-8?B?WHpHVzExL01Gekw1OHVzWHVQbFFWY3dpRlcwdTVmdTVSVE9NVzJIZz09?= X-MS-Exchange-CrossTenant-Network-Message-Id: 0021d85f-a3b1-482b-4845-08de6f0002dd X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB6020.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Feb 2026 15:11:37.6177 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: pXqH8oe86qfS3DIvmRB4JEaJai1H5DWZyQUTVMnppseuJ1ChNinhisWz7yDmJcwJYOi+Zhk0QwPkZx04dXkajw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR11MB6187 X-OriginatorOrg: intel.com On 2/17/2026 4:09 PM, K Prateek Nayak wrote: > Hello Chenyu, > > On 2/17/2026 11:37 AM, Chen, Yu C wrote: >> Hi Prateek, >> >> On 2/16/2026 3:44 PM, K Prateek Nayak wrote: >>> Hello Tim, Chenyu, >>> >>> On 2/11/2026 3:48 AM, Tim Chen wrote: >>>> From: Chen Yu [...] >>>> @@ -2567,10 +2567,18 @@ build_sched_domains(const struct cpumask *cpu_map, struct sched_domain_attr *att >>>>         /* Set up domains for CPUs specified by the cpu_map: */ >>>>       for_each_cpu(i, cpu_map) { >>>> -        struct sched_domain_topology_level *tl; >>>> +        struct sched_domain_topology_level *tl, *tl_llc = NULL; >>>> +        int lid; >>>>             sd = NULL; >>>>           for_each_sd_topology(tl) { >>>> +            int flags = 0; >>>> + >>>> +            if (tl->sd_flags) >>>> +                flags = (*tl->sd_flags)(); >>>> + >>>> +            if (flags & SD_SHARE_LLC) >>>> +                tl_llc = tl; >>> >>> nit. This loop breaks out when sched_domain_span(sd) covers the entire >>> cpu_map and it might have not reached the topmost SD_SHARE_LLC domain >>> yet. Is that cause for any concern? >>> >> >> Could you please elaborate a little more on this? If it covers the >> entire cpu_map shouldn't it stop going up to its parent domain? >> Do you mean, sd_llc_1 and its parent sd_llc_2 could cover the same cpu_map, >> and we should let tl_llc to assigned to sd_llc_2 (sd_llc_1 be degenerated? ) > > I'm not sure if this is technically possible but assume following > topology: > > [ LLC: 8-15 ] > [ SMT: 8,9 ][ SMT: 10,11 ] ... [ SMT: 14,15 ] > > and the following series of events: > > o All CPUs in LLC are offline to begin with (maxcpus = 1 like scenario). > > o CPUs 10-15 are onlined first. > > o CPU8 is put in a separate root partition and brought online. > (XXX: I'm not 100% sure if this is possible in this order) > It can happen, I had a try on VM, and there would be different llc_id within 1 LLC even after CPU8 has been taken out of the separate partition. > o build_sched_domains() will bail out at SMT domain since the cpumap > is covered by tl->mask() and tl_llc = tl_smt. > > o llc_id calculation uses the tl_smt->mask() which will not contain > CPUs 10-15 and CPU8 will get a unique LLC id even though there are > other online CPUs in the LLC with a different llc_id (!!!) > > Fair enough, thanks for the explanation in detail. thanks, Chenyu