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V" , Anshuman Khandual , Paul Walmsley , Christian Borntraeger , catalin.marinas@arm.com, will@kernel.org, Andrew Morton , Mike Kravetz Subject: [PATCH 3/4] hugetlb: do not update address in huge_pmd_unshare Date: Thu, 16 Jun 2022 14:05:17 -0700 Message-Id: <20220616210518.125287-4-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> X-ClientProxiedBy: MW4P222CA0020.NAMP222.PROD.OUTLOOK.COM (2603:10b6:303:114::25) 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: 30d5d0e4-8fc1-4044-8a9f-08da4fdbf2f7 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; X-Microsoft-Antispam-Message-Info: +670796Ud2uwDglHFfmynye2SLPsLm3W6pb/6SS13+zVi+1whFADCzBGpRu4cI0yH78SzzD4eikl0ETozLTGzzx40/KCMv6f4Ycmuw90NGuEPJEA/TfPtDNnQ30PMmq2dhYO7zBCvsd/RaL05PlnEiAfI7wvKzPOKAzzzZozQthpqO75KsCpI3QWD5E2cHOcuyURcYY4cyeiOlFVNcyMHYhxuBOGyDsk77TDYvIt1uOv2lOoIu6CyYvCXBbJnB8PnomrXp8KutO5+GfER2gqm+qZ35lkzq5AdiDNRCLXcwndYKp65nNJkjs+uy5X6whvohLuSkK97jGdIoFGSjS3Z3Yzxax/4vqklOy3bl5dHvs2npiSfZqj4NpmqXmusBpWobJaztmE2FtKIeeU3UhSXgGN8+vPfhZrVk0U1uQnmDKMThFdbJOKnweMVAUDO5JcF2NDLQBvfCwrgIBj/5QraiSGRoA7p+DRgtpk2lDn6nvOXOei/AYHI1SsNfCT7N1rKeUR1KWLuvBIpLULHeGIzHIlYfqhWtT7UGeX1YYX7HDSOJ5YPRO2LgiXQl8CZ2Dxrv4WbCisMcU1z2vkOLFAyGdUMzCvAzaC2fZHIiqcwmhMjLDiyAP1L+31sB04qt+KmSnmGbA2wKsb8agGnUL6QxLtGZJiMTzTeiE2fWXwuTCcULRzX1oTSld2/gxgivU46z5V9VLTD1g7kTkuIdctbw== 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)(366004)(6486002)(38100700002)(6666004)(66946007)(7416002)(83380400001)(316002)(2906002)(66476007)(6506007)(4326008)(8676002)(54906003)(1076003)(498600001)(5660300002)(15650500001)(66556008)(86362001)(26005)(44832011)(36756003)(6512007)(2616005)(186003)(921005)(8936002)(107886003)(14583001);DIR:OUT;SFP:1101; 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Updating a loop control variable outside the loop like this is generally a bad idea. These loops are now using hugetlb_mask_last_page to optimize scanning when non-present ptes are discovered. The same can be done when huge_pmd_unshare returns 1 indicating a pmd was unshared. Remove address update from huge_pmd_unshare. Change the passed argument type and update all callers. In loops sequentially processing addresses use hugetlb_mask_last_page to update address if pmd is unshared. Signed-off-by: Mike Kravetz Acked-by: Muchun Song Reviewed-by: Baolin Wang --- include/linux/hugetlb.h | 4 ++-- mm/hugetlb.c | 47 ++++++++++++++++++----------------------- mm/rmap.c | 4 ++-- 3 files changed, 24 insertions(+), 31 deletions(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index e37465e830fe..ee9a28ef26ee 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -199,7 +199,7 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, unsigned long sz); unsigned long hugetlb_mask_last_page(struct hstate *h); int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long *addr, pte_t *ptep); + unsigned long addr, pte_t *ptep); void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma, unsigned long *start, unsigned long *end); struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, @@ -246,7 +246,7 @@ static inline struct address_space *hugetlb_page_mapping_lock_write( static inline int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long *addr, pte_t *ptep) + unsigned long addr, pte_t *ptep) { return 0; } diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 7c4a82848603..f7da2d54ef39 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -4949,7 +4949,6 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma, struct mm_struct *mm = vma->vm_mm; unsigned long old_end = old_addr + len; unsigned long last_addr_mask; - unsigned long old_addr_copy; pte_t *src_pte, *dst_pte; struct mmu_notifier_range range; bool shared_pmd = false; @@ -4977,14 +4976,10 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma, if (huge_pte_none(huge_ptep_get(src_pte))) continue; - /* old_addr arg to huge_pmd_unshare() is a pointer and so the - * arg may be modified. Pass a copy instead to preserve the - * value in old_addr. - */ - old_addr_copy = old_addr; - - if (huge_pmd_unshare(mm, vma, &old_addr_copy, src_pte)) { + if (huge_pmd_unshare(mm, vma, old_addr, src_pte)) { shared_pmd = true; + old_addr |= last_addr_mask; + new_addr |= last_addr_mask; continue; } @@ -5049,10 +5044,11 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct } ptl = huge_pte_lock(h, mm, ptep); - if (huge_pmd_unshare(mm, vma, &address, ptep)) { + if (huge_pmd_unshare(mm, vma, address, ptep)) { spin_unlock(ptl); tlb_flush_pmd_range(tlb, address & PUD_MASK, PUD_SIZE); force_flush = true; + address |= last_addr_mask; continue; } @@ -6347,7 +6343,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, continue; } ptl = huge_pte_lock(h, mm, ptep); - if (huge_pmd_unshare(mm, vma, &address, ptep)) { + if (huge_pmd_unshare(mm, vma, address, ptep)) { /* * When uffd-wp is enabled on the vma, unshare * shouldn't happen at all. Warn about it if it @@ -6357,6 +6353,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, pages++; spin_unlock(ptl); shared_pmd = true; + address |= last_addr_mask; continue; } pte = huge_ptep_get(ptep); @@ -6780,11 +6777,11 @@ pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma, * 0 the underlying pte page is not shared, or it is the last user */ int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long *addr, pte_t *ptep) + unsigned long addr, pte_t *ptep) { - pgd_t *pgd = pgd_offset(mm, *addr); - p4d_t *p4d = p4d_offset(pgd, *addr); - pud_t *pud = pud_offset(p4d, *addr); + pgd_t *pgd = pgd_offset(mm, addr); + p4d_t *p4d = p4d_offset(pgd, addr); + pud_t *pud = pud_offset(p4d, addr); i_mmap_assert_write_locked(vma->vm_file->f_mapping); BUG_ON(page_count(virt_to_page(ptep)) == 0); @@ -6794,14 +6791,6 @@ int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma, pud_clear(pud); put_page(virt_to_page(ptep)); mm_dec_nr_pmds(mm); - /* - * This update of passed address optimizes loops sequentially - * processing addresses in increments of huge page size (PMD_SIZE - * in this case). By clearing the pud, a PUD_SIZE area is unmapped. - * Update address to the 'last page' in the cleared area so that - * calling loop can move to first page past this area. - */ - *addr |= PUD_SIZE - PMD_SIZE; return 1; } @@ -6813,7 +6802,7 @@ pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma, } int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long *addr, pte_t *ptep) + unsigned long addr, pte_t *ptep) { return 0; } @@ -6926,6 +6915,13 @@ unsigned long hugetlb_mask_last_page(struct hstate *h) /* See description above. Architectures can provide their own version. */ __weak unsigned long hugetlb_mask_last_page(struct hstate *h) { + unsigned long hp_size = huge_page_size(h); + +#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE + /* Required if arch does pmd sharing */ + if (hp_size == PMD_SIZE) + return PUD_SIZE - PMD_SIZE; +#endif return ~(0UL); } @@ -7152,14 +7148,11 @@ void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) mmu_notifier_invalidate_range_start(&range); i_mmap_lock_write(vma->vm_file->f_mapping); for (address = start; address < end; address += PUD_SIZE) { - unsigned long tmp = address; - ptep = huge_pte_offset(mm, address, sz); if (!ptep) continue; ptl = huge_pte_lock(h, mm, ptep); - /* We don't want 'address' to be changed */ - huge_pmd_unshare(mm, vma, &tmp, ptep); + huge_pmd_unshare(mm, vma, address, ptep); spin_unlock(ptl); } flush_hugetlb_tlb_range(vma, start, end); diff --git a/mm/rmap.c b/mm/rmap.c index 04fac1af870b..1c22e5e1219a 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1559,7 +1559,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, */ VM_BUG_ON(!(flags & TTU_RMAP_LOCKED)); - if (huge_pmd_unshare(mm, vma, &address, pvmw.pte)) { + if (huge_pmd_unshare(mm, vma, address, pvmw.pte)) { flush_tlb_range(vma, range.start, range.end); mmu_notifier_invalidate_range(mm, range.start, range.end); @@ -1923,7 +1923,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, */ VM_BUG_ON(!(flags & TTU_RMAP_LOCKED)); - if (huge_pmd_unshare(mm, vma, &address, pvmw.pte)) { + if (huge_pmd_unshare(mm, vma, address, pvmw.pte)) { flush_tlb_range(vma, range.start, range.end); mmu_notifier_invalidate_range(mm, range.start, range.end);