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Thu, 19 Feb 2026 11:26:16 +0000 Message-ID: Date: Thu, 19 Feb 2026 19:25:59 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 04/21] sched/cache: Make LLC id continuous To: Tim Chen , 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 , , 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> <8df218ecf39015830856c7b1053a0f777cc1ea42.camel@linux.intel.com> <579c9039-cd66-41c3-8a72-e73d6f836ee8@amd.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: KL1PR02CA0027.apcprd02.prod.outlook.com (2603:1096:820:d::14) 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_|SA3PR11MB9463:EE_ X-MS-Office365-Filtering-Correlation-Id: b044abeb-6b6a-482f-24bd-08de6fa9b228 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|1800799024; 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Also added change to shrink max LLCs when > the LLC with max id lost its last CPU. > > Thanks. > [ ... ] > + > +static void __sched_domains_free_llc_id(int cpu) > +{ > + int i, lid; > + > + lockdep_assert_held(&sched_domains_mutex); > + > + lid = per_cpu(sd_llc_id, cpu); > + if (lid == -1) > + return; > + > + per_cpu(sd_llc_id, cpu) = -1; > + > + for_each_online_cpu(i) { One minor question: should we only iterate through cpu_coregroup_mask(cpu) to check if any sibling CPU within this LLC owns the llc_id? If there are no online CPUs within this LLC, I assume we should release this llc_id. thanks, Chenyu > + /* An online CPU owns the llc_id. */ > + if (per_cpu(sd_llc_id, i) == lid) > + return; > + } > + > + cpumask_clear_cpu(lid, sched_domains_llc_id_allocmask);