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Fri, 20 Feb 2026 15:53:46 +0000 Message-ID: <2ffbceaa-f9ab-461a-8324-3f500fcf8786@intel.com> Date: Fri, 20 Feb 2026 23:53:31 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 04/21] sched/cache: Make LLC id continuous To: Peter Zijlstra CC: Tim Chen , Ingo Molnar , "Gautham R . Shenoy" , Vincent Guittot , 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 , , K Prateek Nayak References: <60a05a3f50d14a7bf3b968f62cca87893c5c552c.1770760558.git.tim.c.chen@linux.intel.com> <79755f7d-cc68-4189-b6d8-850378e54017@amd.com> <20260219154007.GI1395266@noisy.programming.kicks-ass.net> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <20260219154007.GI1395266@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: KUZPR01CA0020.apcprd01.prod.exchangelabs.com (2603:1096:d10:26::19) 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_|SN7PR11MB7044:EE_ X-MS-Office365-Filtering-Correlation-Id: a419d825-656b-4926-2415-08de70983b3a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|366016; 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>> + >> + lockdep_assert_held(&sched_domains_mutex); >> + >> + lid = cpumask_first_zero(sched_domains_llc_id_allocmask); >> + if (lid >= tl_max_llcs) >> + tl_max_llcs++; > > Urgh,. should we not rather track the max lid? > Do you mean we should not always increment the max lid, but instead decrease it when an llc_id is released? I think Tim has adjusted the code to shrink tl_max_llcs when an llc_id is released: https://lore.kernel.org/all/acc7a5c96e8235bf11af640798ce1b60bcaa8196.camel@linux.intel.com/ > Also, we allocate max_llc sized data structures, if this thing is > 'variable' we must also always store a copy of the 'lid' size of the > time of allocation. > Do you mean we should save the latest llc_max in the sched_domain and publish it during sd attachment, as suggested at: https://lore.kernel.org/all/20260220104533.GO1395266@noisy.programming.kicks-ass.net/ thanks, Chenyu