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Mon, 10 Feb 2025 18:30:48 +0000 Message-ID: <1faef062-ed33-46da-9378-7a224dbee811@intel.com> Date: Mon, 10 Feb 2025 10:30:46 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 16/23] x86/resctrl: Add the functionality to unassigm MBM events To: , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , References: <36262057667c27acad777836cc1497b19cb7c06d.1737577229.git.babu.moger@amd.com> <9746fc25-1657-498a-a290-45baaa8d8c19@intel.com> <1ad70161-2046-4c7f-92c7-809b01c8c957@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <1ad70161-2046-4c7f-92c7-809b01c8c957@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0087.namprd04.prod.outlook.com (2603:10b6:303:6b::32) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|MW6PR11MB8409:EE_ X-MS-Office365-Filtering-Correlation-Id: 1a272064-7597-40f7-1858-08dd4a010a71 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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If all counters are in use, the kernel will show an error >>> message: "Out of MBM assignable counters" when a new assignment is >>> requested. To make space for a new assignment, users must unassign an >> >> To me "kernel will show an error" implies the kernel ring buffer. Please make >> the message accurate and mention that it will be in >> last_cmd_status while also considering to use -ENOSPC to help user space. > > If all the counters are in use, the kernel will log the error message > "Unable to allocate counter in domain" in /sys/fs/resctrl/info/ > last_cmd_status when a new assignment is requested. To make space for a > new assignment, users must unassign an already assigned counter and retry > the assignment again. > This is better, but can user space receive -ENOSPC to avoid needing to check and parse last_cmd_status on every error? Reinette