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Nov 2023 15:15:40 +0000 Message-ID: Date: Thu, 9 Nov 2023 23:15:30 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [Question]: major faults are still triggered after mlockall when numa balancing To: Matthew Wilcox , Peter Zijlstra CC: "zhangpeng (AS)" , , , , , , , , , , , , , Nanyong Sun , Kefeng Wang References: <9e62fd9a-bee0-52bf-50a7-498fa17434ee@huawei.com> <20231109141141.GC8683@noisy.programming.kicks-ass.net> Content-Language: en-US From: "Yin, Fengwei" In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SI2PR01CA0015.apcprd01.prod.exchangelabs.com (2603:1096:4:191::15) To CO1PR11MB4820.namprd11.prod.outlook.com (2603:10b6:303:6f::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PR11MB4820:EE_|SA2PR11MB5017:EE_ X-MS-Office365-Filtering-Correlation-Id: e380c9db-6521-4722-90dc-08dbe136bc20 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 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 VpgMKGCd tDMj3zjktOOUGIisWggJ+/M5MKgh2Ke76mGcZia18NW1Frc5fjXfaUw4hz1EUD0J0V9AplDDCzvDJrwrsLZ06DakoV8JrBEFFUAnT+wYd5ebdGLE8tgsptACf2hXbOAmjlTqKGb37Ro0Lo2EOQBfOnhcT+p561vtgHVXg8tFkFzssiiKwuM84M68awBmTLHSQnjw/q8t0VpiOAjjsfICY7yaN4m+kaUK2G1LGQuUogfd8TDwFIrx3kxLMwykRL3ygCzdXK4HCL6BiS2tdwlB+VAWd5bPRa5q1UFgYvFP1yzJeYWib0tPyTvkUgbtGUbv4kVAaR9/yM+me50y7ROrirDm1HzuGkTVpH6oQwCQTTZm/l8rU9b2Yroq7noWWDKmK2nQomb531w1JBtJgPAud+kHvZw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 11/9/2023 10:29 PM, Matthew Wilcox wrote: > On Thu, Nov 09, 2023 at 03:11:41PM +0100, Peter Zijlstra wrote: >> On Thu, Nov 09, 2023 at 09:47:24PM +0800, zhangpeng (AS) wrote: >>> Is there any way to avoid such a major fault? >> >> man madvise > > but from the mlockall manpage: > > mlockall() locks all pages mapped into the address space of the calling > process. This includes the pages of the code, data, and stack segment, > as well as shared libraries, user space kernel data, shared memory, and > memory-mapped files. All mapped pages are guaranteed to be resident in > RAM when the call returns successfully; the pages are guaranteed to > stay in RAM until later unlocked. > > https://pubs.opengroup.org/onlinepubs/9699919799/functions/mlockall.html > isn't quite so explicit, but I do think that page cache should be locked > into memory. Here is my understanding. It's related with write to a mlocked private file mapping. From Peng: "For the data segment, the global variable area is a private mapping". So it's data segment of ELF file and mapped privately by ELF loader. For this case, even ELF loader is updated to mlock the data segment, a write will trigger COW and a new anonymous page will be allocated and mlocked. The original file mapped page will be munlocked in do_wp_page() wp_page_copy() if (old_folio) { page_remove_rmap() } So it's possible the original file mapped page is reclaimed and later accessing will trigger major fault. Regards Yin, Fengwei