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Mon, 10 Nov 2025 21:40:34 +0000 Message-ID: Date: Mon, 10 Nov 2025 13:40:32 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] x86/resctrl: Add io_alloc_min_cbm_all interface for CBM reset To: "Luck, Tony" , Babu Moger , "Aaron Tomlin" CC: "Dave.Martin@arm.com" , "james.morse@arm.com" , "babu.moger@amd.com" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "linux-kernel@vger.kernel.org" References: <20251107012401.224515-1-atomlin@atomlin.com> <20251107012401.224515-2-atomlin@atomlin.com> <2a0b270a-e398-4d88-aa10-421f2769a759@amd.com> <53iuqiul6uo7zj6sfckm2h465cjusaxvpxrtdmnbmhvbzuqiq6@7ogm3zqddzjd> <4whfbgq336xfuov4i4nwwrn35ywwlwizuvpdlstmdqzkhvwrq6@eits26xbwyz6> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR02CA0024.namprd02.prod.outlook.com (2603:10b6:303:16d::9) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) 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: SJ2PR11MB7573:EE_|SA2PR11MB4780:EE_ X-MS-Office365-Filtering-Correlation-Id: 01464aad-3132-4a3b-630f-08de20a1c77d 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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But >>> >>> # echo "L2:*=ffff" > schemata >>> >>> would try to set unimplemented bits on some cores and would fail. >> >> >> I would consider this a user error, as the user is expected to know the >> supported value for the domain. >> This situation can occur even now — we simply report the error and exit. > > Babu > > Maybe it was a poor explanation on my part. > > On a hybrid P-core/E-core system with different L2 cache topology schemata > may look like this (8 L2 domains of one type, 4 L2 domains of other type. > > $ cat schemata > L2:0=ffff;1=ffff;2=ffff;3=ffff;4=ffff;5=ffff;6=ffff;7=ffff;8=7f;9=7f;10=7f;11=7f > > The proposed wildcard syntax is only useful to set all domains to a value > that is legal for all domains. It cannot be used for the "reset back to defaults" > case because different domains have different defaults. Disabling and re-enabling of io_alloc may be substitute for "reset back to defaults". The '*' syntax would be useful to initialize domains to minimal allocations ... assuming all cache instances support the same minimum. Would it be an issue if user attempts to assign a value that is not supported to all domains? resctrl could fail on first invalid bitmask and the last_cmd_status can then be expected to indicate the details of error. Reinette