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V" , Anshuman Khandual , Paul Walmsley , Christian Borntraeger , catalin.marinas@arm.com, will@kernel.org, Rolf Eike Beer , Andrew Morton , Mike Kravetz Subject: [PATCH v2 0/4] hugetlb: speed up linear address scanning Date: Tue, 21 Jun 2022 16:56:16 -0700 Message-Id: <20220621235620.291305-1-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.35.3 X-ClientProxiedBy: MW4P221CA0009.NAMP221.PROD.OUTLOOK.COM (2603:10b6:303:8b::14) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 9785a83f-1ace-4793-e9ff-08da53e1a894 X-MS-TrafficTypeDiagnostic: MWHPR10MB1501:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BY5PR10MB4196.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(376002)(346002)(366004)(136003)(39860400002)(396003)(7416002)(38100700002)(478600001)(316002)(6666004)(186003)(5660300002)(8936002)(2616005)(1076003)(107886003)(83380400001)(41300700001)(2906002)(86362001)(8676002)(66556008)(26005)(6512007)(66946007)(36756003)(66476007)(44832011)(6486002)(4326008)(54906003)(921005)(6506007);DIR:OUT;SFP:1101; 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We can optimize these scans if the ranges are sparsely populated. Also, enable page table "Lazy copy" for hugetlb at fork. NOTE: Architectures not defining CONFIG_ARCH_WANT_GENERAL_HUGETLB need to add an arch specific version hugetlb_mask_last_page() to take advantage of sparse address scanning improvements. Baolin Wang added the routine for arm64. Other architectures which could be optimized are: ia64, mips, parisc, powerpc, s390, sh and sparc. v1->v2 Change hugetlb_mask_last_page default code to 0 instead of ~0. Peter Fix build issues on i386, including going back to if-else-if instead of switch in hugetlb_mask_last_page. kernel test robot Update commit message. Rolf Eike Beer Changes were relatively minor, so I left the Reviewed-by and ACKed-by tags. Baolin Wang (1): arm64/hugetlb: Implement arm64 specific hugetlb_mask_last_page Mike Kravetz (3): hugetlb: skip to end of PT page mapping when pte not present hugetlb: do not update address in huge_pmd_unshare hugetlb: Lazy page table copies in fork() arch/arm64/mm/hugetlbpage.c | 20 +++++++ include/linux/hugetlb.h | 5 +- mm/hugetlb.c | 102 +++++++++++++++++++++++++----------- mm/memory.c | 2 +- mm/rmap.c | 4 +- 5 files changed, 96 insertions(+), 37 deletions(-)