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Fri, 21 Nov 2025 00:58:57 +0000 From: Date: Thu, 20 Nov 2025 16:58:55 -0800 To: Michal Clapinski , Dan Williams , Vishal Verma , "Dave Jiang" , , CC: Pasha Tatashin , , Michal Clapinski Message-ID: <691fb94f7aee9_1eb85100cd@dwillia2-mobl4.notmuch> In-Reply-To: <20251024210518.2126504-1-mclapinski@google.com> References: <20251024210518.2126504-1-mclapinski@google.com> Subject: Re: [PATCH v3 0/5] dax: add PROBE_PREFER_ASYNCHRONOUS to all the dax drivers Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR03CA0344.namprd03.prod.outlook.com (2603:10b6:a03:39c::19) 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_|SA2PR11MB5018:EE_ X-MS-Office365-Filtering-Correlation-Id: 52a8c6de-e719-4a3c-4942-08de28992661 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; 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The current behavior unnecessarily slows down > the boot by synchronously probing dax devices, so let's change that. > > For thousands of devices, this change saves >1s of boot time. > > Michal Clapinski (5): > dax: add PROBE_PREFER_ASYNCHRONOUS to the pmem driver > dax: add PROBE_PREFER_ASYNCHRONOUS to the kmem driver > dax: add PROBE_PREFER_ASYNCHRONOUS to the cxl driver > dax: add PROBE_PREFER_ASYNCHRONOUS to the hmem drivers > dax: add PROBE_PREFER_ASYNCHRONOUS to the dax device driver After seeing the trouble this causes with libdaxctl and failing to find a quick fix I wonder if you should just go through route of eating the potential regressions in your own environment. I.e. instead of making it a problem that the kernel needs to debug for all legacy users, how about you just boot with the command line option: driver_async_probe=device_dax ...or add the following to your mopdrobe configuration: options device_dax async_probe I.e. do you really need to change this policy globally for everyone at this point? I do want to improve this, but I think it will take time for libdaxctl to get ready for this flag day.