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IA1PR10MB7309.namprd10.prod.outlook.com (2603:10b6:208:3fe::13) by DS4PPFFE8543B68.namprd10.prod.outlook.com (2603:10b6:f:fc00::d5b) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9115.22; Thu, 9 Oct 2025 15:06:32 +0000 Received: from IA1PR10MB7309.namprd10.prod.outlook.com ([fe80::5f79:36e9:a632:d010]) by IA1PR10MB7309.namprd10.prod.outlook.com ([fe80::5f79:36e9:a632:d010%5]) with mapi id 15.20.9203.007; Thu, 9 Oct 2025 15:06:32 +0000 From: Prakash Sangappa To: David Hildenbrand CC: Jann Horn , "Uschakow, Stanislav" , "linux-mm@kvack.org" , "trix@redhat.com" , "ndesaulniers@google.com" , "nathan@kernel.org" , "akpm@linux-foundation.org" , "muchun.song@linux.dev" , "mike.kravetz@oracle.com" , Lorenzo Stoakes , Liam Howlett , "osalvador@suse.de" , "vbabka@suse.cz" , "stable@vger.kernel.org" Subject: Re: Bug: Performance regression in 1013af4f585f: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race Thread-Topic: Bug: Performance regression in 1013af4f585f: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race Thread-Index: AQHcOKaJslt4snb5vUaiZKYBU5CBjrS5agKAgACBPAA= Date: Thu, 9 Oct 2025 15:06:32 +0000 Message-ID: <007F4FBA-CD09-4D72-A774-33E36335BE95@oracle.com> References: <4d3878531c76479d9f8ca9789dc6485d@amazon.de> <2dcf12d0-e29c-4c9b-aeac-a0b803d2c2fd@redhat.com> <805DB7B5-23C2-437F-BB94-2188E310FD75@oracle.com> <8a65e8c1-3028-4f9c-bf1f-c8f1d3956192@redhat.com> In-Reply-To: <8a65e8c1-3028-4f9c-bf1f-c8f1d3956192@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3826.700.81) x-ms-publictraffictype: Email x-ms-traffictypediagnostic: IA1PR10MB7309:EE_|DS4PPFFE8543B68:EE_ x-ms-office365-filtering-correlation-id: 4867e9de-5d8c-4d6d-1495-08de07456ec0 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024|38070700021; x-microsoft-antispam-message-info: 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