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Thu, 11 Jan 2024 23:31:44 +0000 Received: from SJ2PR11MB7573.namprd11.prod.outlook.com ([fe80::c903:6ee5:ed69:f4fa]) by SJ2PR11MB7573.namprd11.prod.outlook.com ([fe80::c903:6ee5:ed69:f4fa%7]) with mapi id 15.20.7181.018; Thu, 11 Jan 2024 23:31:44 +0000 Message-ID: <30593e56-d575-4e40-8b78-b2a75a7eb822@intel.com> Date: Thu, 11 Jan 2024 15:31:41 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [EXT] Re: [RFC 00/12] ARM: MPAM: add support for priority partitioning control Content-Language: en-US To: "Luck, Tony" , Peter Newman CC: Amit Singh Tomar , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "Yu, Fenghua" , "james.morse@arm.com" , George Cherian , "robh@kernel.org" References: <20230815152712.1760046-1-amitsinght@marvell.com> <6114c8d0-97a1-be54-3e43-30348be38683@intel.com> <1daadc08-57e9-40b6-9a34-cfe47d368348@intel.com> From: Reinette Chatre In-Reply-To: X-ClientProxiedBy: MW4PR03CA0060.namprd03.prod.outlook.com (2603:10b6:303:8e::35) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|SA0PR11MB4560:EE_ X-MS-Office365-Filtering-Correlation-Id: d959c607-88fb-4b86-df97-08dc12fd78c0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Tony, On 1/11/2024 3:14 PM, Luck, Tony wrote: >>> I'm not sure having multiple lines for the same resource makes anything >>> clearer. I preferred one of the earlier proposals like this one: >>> >>> L3:0=XXXX,PPART=X,CCAP=X;1=YYYY,CCAP=Y >> >> This assumes that all tools (public and private) that currently parse the schemata >> file will be able to handle this additional information seamlessly. > > Reinette, > > Yes. If there are tools that *read* schemata files, they will be surprised by this extra information. > > But that also applies if the "extra" information is moved to a second line that also begins with "L3:". > > Tools that *write* schemata files should be OK as long as the kernel will still accept: > > # echo "L3:1=fff" > schemata > > E.g. the Linux selftests in tools/testing/selftests/resctrl/ should still run without > any modification. > > The "separate line" option could work if the prefix isn't "L3:". E.g. > > L3:0=XXXX;1=YYYY > L3PPART:0=X > L3CCAP:0=X;1=Y > > If these options are asymmetrically available on cache instances, these extra > lines won't have every L3 cache instance listed. I think we are going in circles here. I shared my concern about user space breakage a while ago [1] in response to your previous proposal and this new proposal seems to match where this thread ended [2] last year. Reinette [1] https://lore.kernel.org/lkml/be51596e-2e62-2fb9-4176-b0b2a2abb1d3@intel.com/ [2] https://lore.kernel.org/lkml/20230901160451.00001f75@Huawei.com/ _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel