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Thu, 5 Nov 2026 15:58:08 +0000 Message-ID: <0a2b0685-ed32-4e7a-b724-1b5be075ca19@intel.com> Date: Thu, 5 Nov 2026 07:58:05 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] fs/resctrl: Report why a schemata write failed To: Jinjie Ruan , , , , , , , References: <20261104102304.703535-1-ruanjinjie@huawei.com> <0bece210-cd99-4f4c-83cc-c58b59b7ebec@intel.com> <5e6fc827-d5ca-4e72-ab8b-3ad63d530c19@huawei.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <5e6fc827-d5ca-4e72-ab8b-3ad63d530c19@huawei.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW3PR05CA0002.namprd05.prod.outlook.com (2603:10b6:303:2b::7) To IA0PR11MB8379.namprd11.prod.outlook.com (2603:10b6:208:488::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: IA0PR11MB8379:EE_|IA3PR11MB9349:EE_ X-MS-Office365-Filtering-Correlation-Id: 1d1327f5-9caf-4afc-7e48-08df3b55958c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|23010399003|1800799024|22082099003|18002099003|6133799003|10067099003|3023799007|4143699003|56012099006|11063799006|261026140227099003|261028144727099003|261022105027099003|261022075727099003|261102123227099003|261021121427099003|261009223027099003|261026121527099003; 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>>> >>> ret = resctrl_arch_update_domains(r, rdtgrp->closid); >>> - if (ret) >>> + if (ret) { >>> + rdt_last_cmd_printf("%s: failed to update the domains: %pe\n", >>> + r->name, ERR_PTR(ret)); >> >> Please instead display the schema name (s->name) to user space as that is the name >> that the user use to interact with the schemata file. >> Is it necessary to print error code again? This is the same error returned to >> user space, no? >> >> I do not know what resctrl fs can claim here about hardware state - could such >> a write then partially succeed on MPAM side? If so, best fs can display may be >> something like "failed to update all domains". If so, could user space follow this >> with a read of schemata file to see which domains failed? User may want to retry >> in such scenario ... but back to earlier question, this sounds like a permanent >> failure (until CPUs are back online) when attempting to make domain configuration >> changes that does not sound right here. > > There are some cases not permanent: > > - PCC/MPAM-Fb MSC returns -EIO in case of protocol errors or timeouts > （mpam_fb_send_request() or smp_call_on_cpu()）; > > - -EINVAL when the calculated PARTID is out of bounds > (resctrl_arch_update_one()). > > Both will roll back and retry after the cause is resolved will succeed. Could you please provide more detail about the above "roll back and retry"? I am trying to view this from user space side. The "PARTID is out of bounds" sounds like a bug in the "should never happen" category. I am not familiar with everything that can fall into the "protocol errors or timeouts" bucket. Would it be worthwhile for user to try again when these are encountered? Could "-EBUSY" be more appropriate to help user know when it is worthwhile to retry? If it is not possible to retry, does that mean a permanent failure for which the domain should rather be removed to prevent user from encountering the same issue over and over? > > I verified these error cases using fault inject for mpam_touch_msc(). > Thank you very much for all this testing. Reinette