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Tue, 17 Feb 2026 17:53:02 +0000 Message-ID: <1f076261-55f7-4dc9-ac58-1ed39763b323@intel.com> Date: Tue, 17 Feb 2026 09:52:59 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 4/5] kselftests/resctrl: set shareable_mask to zero if all bits are shared between software and hardware To: Shaopeng Tan , , , , CC: , , References: <20260123044034.141247-1-tan.shaopeng@fujitsu.com> <20260123044034.141247-5-tan.shaopeng@fujitsu.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: <20260123044034.141247-5-tan.shaopeng@fujitsu.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0303.namprd04.prod.outlook.com (2603:10b6:303:82::8) 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_|IA1PR11MB8831:EE_ X-MS-Office365-Filtering-Correlation-Id: c2c768a9-6904-4328-dc13-08de6e4d653f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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How can "software-exclusive" be guaranteed in a run of the CAT test? If some hardware happens to allocate into the cache while the CAT test runs then the test is more likely to fail without there actually being a problem with resctrl. > > To enable CAT, if all bits are shared between hardware and software, > set shareable_mask to zero. Please let this architecture specific addition only apply to MPAM accompanied by a comment. Reinette