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Fri, 14 Mar 2025 15:44:08 +0000 Date: Fri, 14 Mar 2025 08:44:05 -0700 From: Dan Williams To: Jonathan Cameron , Yuquan Wang CC: , Subject: Re: [PATCH] docs/cxl: Add serial number for persistent-memdev Message-ID: <67d44ec5a79c1_12e31294ea@dwillia2-xfh.jf.intel.com.notmuch> References: <20250217112039.138650-1-wangyuquan1236@phytium.com.cn> <20250220161213.000049a9@huawei.com> <20250221065509-mutt-send-email-mst@kernel.org> <17b91a9f.2847.1955fd23d78.Coremail.wangyuquan1236@phytium.com.cn> <20250305141359.00001288@huawei.com> <4752672.2b5f.19565e01b65.Coremail.wangyuquan1236@phytium.com.cn> <20250312181035.00006e32@huawei.com> Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250312181035.00006e32@huawei.com> X-ClientProxiedBy: MW4PR04CA0323.namprd04.prod.outlook.com (2603:10b6:303:82::28) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|SA2PR11MB5132:EE_ X-MS-Office365-Filtering-Correlation-Id: 1a1e93e5-9cce-4a6d-c622-08dd630f0e95 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016; 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I've queued it up on my gitlab staging tree, but > > > > > > Michael if you want to pick this one directly that's fine as well. > > > > > > > > > > See no reason to, I was not even CC'd. > > > > > > > > Hi, Michael > > > > > > > > I'm sorry, this is my fault. I used "get_maintainer.pl" to check this > > > > patch's maintainers but it shows "No maintainers found, printing recent > > > > contributors". > > > > > > > I usually stage up multiple series together and send on to Michael. > > > So it was be being lazy for a minor change rather than anything much > > > that you did wrong. > > > > > > If I get time I'll post a series with this a few other patches > > > later today. > > > > > > Jonathan > > > > > Thank you! > > > > BTW, I found a corner case in CXL numa node creation. > > > > Condition: > > 1) A UMA/NUMA system without SRAT, but with CEDT.CFMWS > > 2）Enable CONFIG_ACPI_NUMA > > > > Results: > > 1) acpi_numa_init: the fake_pxm will be 0 and send to acpi_parse_cfmws() > > 2）If dynamically create cxl ram region, the cxl memory would be assigned > > to node0 rather than a new node > > > > Confusions: > > 1) Is a numa system a requirement for CXL memory usage? > > Obviously discussion has gone on elsewhere, but I'd say in general it > would be a bad idea to not have an SRAT because the moment we add CXL > it is definitely a NUMA system and we want the Generic Port entry to > allow us to get perf information. > > So I wouldn't mind if we fail CXL init in this case, but maybe > it is worth papering over things. I think that is too severe. If a driver has a path to advertise resources, even in a less than ideal way, it should make every effort to do that. There are plenty of ways for the NUMA information to fail, that does not mean the memory needs to be prevented from coming online. Let the end user decide if lack of performance information is fatal.