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Shutemov" , "Matthew Wilcox (Oracle)" , "Ryan Roberts" , "Hugh Dickins" , "Yang Shi" , "Miaohe Lin" , "Kefeng Wang" , "Yu Zhao" , "John Hubbard" , , To: "David Hildenbrand" , , "Andrew Morton" , "Baolin Wang" From: "Zi Yan" Subject: Re: [PATCH 1/3] selftests/mm: make file-backed THP split work by setting force option X-Mailer: aerc 0.19.0 References: <20250122124047.1216024-1-ziy@nvidia.com> <04002289-c78f-4e1d-b242-144dd53a62f8@redhat.com> In-Reply-To: X-ClientProxiedBy: BN0PR03CA0033.namprd03.prod.outlook.com (2603:10b6:408:e7::8) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB9473:EE_|CYXPR12MB9277:EE_ X-MS-Office365-Filtering-Correlation-Id: 8441295c-3460-4315-c2c7-08dd3afb643a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016; X-Microsoft-Antispam-Message-Info: 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ByNDZtm196HCSDWSSqABWRYoZCXVrmlutMq9wTsrKYciTmA/z4cEPEHlLZPsZpHUsgujqjIS8zMhnAvxv1Q8cDUDYxauvlIjUYAvEKGZmL265PzloeJzco2yY6s74sRRZd37+DaYFghkUqe2MROSWTKPvGqgrYetfH0npWvSuCw2NbhTgrlR/9Sdd/v2e5fU/cCA7vDBSS7gm+qNl05hyQxW0liZuLJQbXNsR6G81CwNcwTEpHn3oAssLy+nWEn31AWo0FOP665W6nBfRADFRFgY8El7NHhJ4q2b0GmSBSr4lYJKN2jY/JAahJDiWbpABABDNB8T9PPWLYeU= 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 Wed Jan 22, 2025 at 10:27 AM EST, David Hildenbrand wrote: > On 22.01.25 16:16, Zi Yan wrote: >> On Wed Jan 22, 2025 at 9:26 AM EST, David Hildenbrand wrote: >>> On 22.01.25 13:40, Zi Yan wrote: >>>> Commit acd7ccb284b8 ("mm: shmem: add large folio support for tmpfs") >>>> changes huge=3Dalways to allocate THP/mTHP based on write size and >>>> split_huge_page_test does not write PMD size data, so file-back THP is= not >>>> created during the test. >>> >>> Just curious, why can't we write PMD size data instead, to avoid messin= g >>> with the "force" option? >>=20 >> It also works. I used "force", because I notice that it is intended for >> testing. Using it might be more future proof, in case huge=3Dalways chan= ges >> its semantics again in the future. > > I recall discussing with Hugh in an upstream call that "force" is a=20 > relict from older times, so naturally I would have just adjusted the=20 > test case to trigger the PMD scenario. No strong opinion, though, was=20 > just wondering. Got it. Let me change it and resend. Thank you for the feedback. --=20 Best Regards, Yan, Zi