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Thu, 13 Aug 2026 15:19:42 +0000 Message-ID: <5e07c57d-b971-4c7a-bdfe-3b9c6f299b8b@intel.com> Date: Thu, 13 Aug 2026 08:19:38 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [RFC v2] arm,x86,fs/resctrl: Generic schema description Proof of Concept To: Chen Yu CC: Tony Luck , Borislav Petkov , "Thomas Gleixner" , Dave Hansen , Peter Newman , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Dave Martin , Ben Horgan , James Morse , Babu Moger , Drew Fustini , Fenghua Yu , Chen Yu References: <9e38f138-7872-445d-9a11-105f9d0fa4d0@intel.com> <07a79f5f-ad39-447d-b43d-01e44c7870a2@intel.com> <5ecbbe3d-aa8c-409b-8963-0ee50b456814@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P222CA0018.NAMP222.PROD.OUTLOOK.COM (2603:10b6:303:114::23) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) 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: SJ2PR11MB8370:EE_|PH3PPFE241D7F14:EE_ X-MS-Office365-Filtering-Correlation-Id: 4594e81e-a00b-443e-a993-08def94e4c5a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|23010399003|4143699003|10067099003|56012099006|11063799006|18002099003|22082099003; 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Even >>> here there would be a requirement to communicate to userspace which controllers could be >>> enabled/disabled together ... which is the same as the emulated list, no? >> >> I see. So we actually need a single option (control_mode) to switch between >> modes (legacy vs. >> native, mutually exclusive), rather than giving each controller its own >> independent enable/disable >> toggle. The emulated list is one way to implement control_mode, ensuring >> "legacy" and "native" >> are mutually exclusive. >> > > While adjusting the region aware code on this emulation part, a minor issue is found > in commit ("fs/resctrl: Support emulated controls") > > diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c > index cac4b3293cef..ab7d3fa3f337 100644 > --- a/fs/resctrl/rdtgroup.c > +++ b/fs/resctrl/rdtgroup.c > @@ -124,7 +124,7 @@ void rdt_staged_configs_clear(void) > if (list_empty(&ctrl->emulated_by)) > continue; > list_for_each_entry(em_ctrl, &ctrl->emulated_by, entry) { > - list_for_each_entry_rcu(dom, &ctrl->domains, hdr.list, lockdep_is_cpus_held()) > + list_for_each_entry_rcu(dom, &em_ctrl->domains, hdr.list, lockdep_is_cpus_held()) > memset(dom->staged_config, 0, sizeof(dom->staged_config)); > } > } Thank you very much. Squashed and available in branch resctrl/controls_rfc_v2.2 Reinette