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Fri, 24 Jul 2026 23:53:28 +0000 Message-ID: <911ccf29-e152-4bf1-9773-04680bbe9638@intel.com> Date: Fri, 24 Jul 2026 16:53:26 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] x86/resctrl, Documentation: Keep mbm_assign_mode "default" on boot To: Borislav Petkov CC: "Moger, Babu" , Babu Moger , , , , , , , , , , , , , , References: <8cb66e18e32e4087a9712c1e68ee6da614efe244.1784322818.git.babu.moger@amd.com> <78996219-a8de-4dc3-90ee-db4c19e0d66a@amd.com> <48fef38f-8e2a-45e3-bb60-f293a1d60be8@amd.com> <20260724231239.GAamPxZ2IZiFYRmAfg@fat_crate.local> Content-Language: en-US From: Reinette Chatre In-Reply-To: <20260724231239.GAamPxZ2IZiFYRmAfg@fat_crate.local> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0110.namprd03.prod.outlook.com (2603:10b6:303:b7::25) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) 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: SJ2PR11MB8370:EE_|PH8PR11MB7141:EE_ X-MS-Office365-Filtering-Correlation-Id: 86298796-5052-490d-1dbd-08dee9dec22e 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|7416014|376014|23010399003|366016|1800799024|6133799003|11063799006|4143699003|56012099006|10067099003|18002099003|22082099003; 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Then stuff gets reverted immediately. Because we > don't break userspace. Ever. ack. One clarification here is that as I understand there has not yet been an actual user complaint. At least not that the pqos utility mentioned in this thread is aware of. Instead I struggle with the speculation about possible user complaints with different interpretations on how this change could be perceived by users. > It really is that simple. And I see your point about wrong usage and so on. > But as long as users do use it this way, we don't break that usage. ok. When considering a change like this, should it be a stable candidate to help reduce the number of kernels with different behaviors? The patch notes mention that this change is planned to be reverted at some point in the future and I have not heard of any changes to this plan. Considering the stated intention from everybody to maintain user interface I assume this plan is off the table? > > But let's see what other x86 folks think. Thank you very much for your guidance. Reinette