From 458aa76d132dc1c3c60be0f0db99bcc0ce1767fc Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Thu, 17 Mar 2016 14:18:56 -0700 Subject: mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb_range We remove one instace of flush_tlb_range here. That was added by commit f714f4f20e59 ("mm: numa: call MMU notifiers on THP migration"). But the pmdp_huge_clear_flush_notify should have done the require flush for us. Hence remove the extra flush. Signed-off-by: Aneesh Kumar K.V Cc: Mel Gorman Cc: "Kirill A. Shutemov" Cc: Vineet Gupta Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/migrate.c | 8 +++++--- mm/pgtable-generic.c | 14 -------------- 2 files changed, 5 insertions(+), 17 deletions(-) (limited to 'mm') diff --git a/mm/migrate.c b/mm/migrate.c index 568284e..fdaf081 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1773,7 +1773,10 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, put_page(new_page); goto out_fail; } - + /* + * We are not sure a pending tlb flush here is for a huge page + * mapping or not. Hence use the tlb range variant + */ if (mm_tlb_flush_pending(mm)) flush_tlb_range(vma, mmun_start, mmun_end); @@ -1829,12 +1832,11 @@ fail_putback: page_add_anon_rmap(new_page, vma, mmun_start, true); pmdp_huge_clear_flush_notify(vma, mmun_start, pmd); set_pmd_at(mm, mmun_start, pmd, entry); - flush_tlb_range(vma, mmun_start, mmun_end); update_mmu_cache_pmd(vma, address, &entry); if (page_count(page) != 2) { set_pmd_at(mm, mmun_start, pmd, orig_entry); - flush_tlb_range(vma, mmun_start, mmun_end); + flush_pmd_tlb_range(vma, mmun_start, mmun_end); mmu_notifier_invalidate_range(mm, mmun_start, mmun_end); update_mmu_cache_pmd(vma, address, &entry); page_remove_rmap(new_page, true); diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index 06a005b..71c5f91 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -84,20 +84,6 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, #ifdef CONFIG_TRANSPARENT_HUGEPAGE -#ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE - -/* - * ARCHes with special requirements for evicting THP backing TLB entries can - * implement this. Otherwise also, it can help optimize normal TLB flush in - * THP regime. stock flush_tlb_range() typically has optimization to nuke the - * entire TLB if flush span is greater than a threshold, which will - * likely be true for a single huge page. Thus a single thp flush will - * invalidate the entire TLB which is not desirable. - * e.g. see arch/arc: flush_pmd_tlb_range - */ -#define flush_pmd_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) -#endif - #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp, -- cgit v1.1