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Thu, 16 Jun 2022 21:05:35 +0000 Received: from BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::2125:9bb7:bfeb:81f9]) by BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::2125:9bb7:bfeb:81f9%8]) with mapi id 15.20.5353.015; Thu, 16 Jun 2022 21:05:35 +0000 From: Mike Kravetz To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 4/4] hugetlb: Lazy page table copies in fork() Date: Thu, 16 Jun 2022 14:05:18 -0700 Message-Id: <20220616210518.125287-5-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220616210518.125287-1-mike.kravetz@oracle.com> References: <20220616210518.125287-1-mike.kravetz@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MW4PR04CA0109.namprd04.prod.outlook.com (2603:10b6:303:83::24) 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: def82adf-ef2e-490c-63f2-08da4fdbf4ac X-MS-TrafficTypeDiagnostic: DS0PR10MB6197:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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V" , Baolin Wang , Muchun Song , Andrew Morton , Christian Borntraeger , Naoya Horiguchi , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Lazy page table copying at fork time was introduced with commit commit d992895ba2b2 ("[PATCH] Lazy page table copies in fork()"). At the time, hugetlb was very new and did not support page faulting. As a result, it was excluded. When full page fault support was added for hugetlb, the exclusion was not removed. Simply remove the check that prevents lazy copying of hugetlb page tables at fork. Of course, like other mappings this only applies to shared mappings. Lazy page table copying at fork will be less advantageous for hugetlb mappings because: - There are fewer page table entries with hugetlb - hugetlb pmds can be shared instead of copied In any case, completely eliminating the copy at fork time should speed things up. Signed-off-by: Mike Kravetz Acked-by: Muchun Song Acked-by: David Hildenbrand --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memory.c b/mm/memory.c index fee2884481f2..90d2a614b2de 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1262,7 +1262,7 @@ vma_needs_copy(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma) if (userfaultfd_wp(dst_vma)) return true; - if (src_vma->vm_flags & (VM_HUGETLB | VM_PFNMAP | VM_MIXEDMAP)) + if (src_vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP)) return true; if (src_vma->anon_vma) -- 2.35.3