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IA1PR10MB7309.namprd10.prod.outlook.com (2603:10b6:208:3fe::13) by LV8PR10MB7989.namprd10.prod.outlook.com (2603:10b6:408:203::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9203.9; Wed, 8 Oct 2025 22:54:55 +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; Wed, 8 Oct 2025 22:54:55 +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 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