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Tue, 27 Oct 2026 14:23:37 +0000 Message-ID: <3d64061e-e571-43ea-8216-170a726b4029@intel.com> Date: Tue, 27 Oct 2026 07:23:34 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v2 00/10] arm_mpam: resctrl: Separate MPAM domains To: Jinjie Ruan , , , , CC: , , , , , , References: <9e0521af-4ae2-4a53-bbd5-2d86cceb69c3@huawei.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: <9e0521af-4ae2-4a53-bbd5-2d86cceb69c3@huawei.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR03CA0069.namprd03.prod.outlook.com (2603:10b6:303:b6::14) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB8370:EE_|SA2PR11MB4827:EE_ X-MS-Office365-Filtering-Correlation-Id: e07020fd-fe03-4de8-2c28-08df3435e39c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|23010399003|366016|261026140227099003|260925021911599003|260925022911599003|260925021311599003|4143699003|11063799006|56012099006|261022075727099003|261022113327099003|261022105027099003|261021121427099003|261009223027099003|10067099003|18002099003|261026121527099003|22082099003|6133799003; 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On a system that supports both allocation and >> monitoring, one instance is created for each domain and its two >> domains are added to the resource's control and monitoring domain >> lists. >> >> Holding both domains in one structure requires control and monitoring >> to be done at the same scope, and ties each control domain to a >> monitoring domain. This does not fit the proposed support for multiple >> controls per resource [1]. There, each control of a resource, for >> example a "min" and a "max" memory bandwidth control, has its own list >> of control domains while the resource keeps a single list of >> monitoring domains. With one structure for both, every control domain >> would come with a monitoring domain of its own, which does not reflect >> the resource. >> >> This series gives control and monitoring domains their own structures, >> set up and torn down independently as CPUs come online and go offline, >> in preparation for supporting multiple controls per resource. Along >> the way it stops failing CPU online when a domain cannot be set up, >> and adds checks when setting up a monitoring domain. >> >> 1-2 Preparatory cleanups of domain allocation >> 3 Do not fail CPU online when domain setup fails >> 4-6 Separate the control and monitoring domain structures >> 7-9 Checks when setting up a monitoring domain >> 10 Comment update, kept separate for review >> >> An earlier version of the domain split was posted on its own [2]. This >> version incorporates the feedback from that discussion. It gives each >> type of domain its own structure instead of duplicating the shared >> one, sets up each domain independently instead of undoing one domain >> when setting up the other fails, and adds the checks in patches 8 and >> 9. >> >> Patch 7 turns a WARN_ON_ONCE(0) into a warning that fires. It is a >> separate patch because it is not clear whether the silent failure was >> intended. If it was, the patch can instead drop the dead >> WARN_ON_ONCE(). >> >> This is an RFC because I am only able to compile test MPAM changes, >> which is also why the patches are small and each change is justified >> on its own. Patches can be squashed if preferred, for example patch 10 >> into patches 5 and 9. Testing on MPAM hardware would be greatly >> appreciated, as is any other feedback. > > Hi Reinette, > > I tested it on a QEMU with MPAM rebased on v7.3-rc6 and all pass: > > 1、Resctrl mounts，L3/L2 each report 32 closids (control IDs) > 2、Cache and memory bandwidth controls > 3、Priority, min, max, option and hard-limit: write, read back, and the > > emulated hardware shows the same value > 4、CDP mode and usage/bandwidth counters > 5、All builds pass without warnings: arm64/x86_64, debug on/off, > self-tests on/off, resctrl off, ACPI off > > Test cases: https://github.com/ruanjinjie-eng/mpam_testcase/tree/qemu > > Tested-by: Jinjie Ruan ruanjinjie@huawei.com Thank you very much for this thorough testing. It is much appreciated. Reinette