From: Kirill A. Shutemov Date: Tue, 8 Sep 2015 21:58:37 +0000 (-0700) Subject: thp: vma_adjust_trans_huge(): adjust file-backed VMA too X-Git-Tag: firefly_0821_release~176^2~1103^2~135 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e1b9996b85ba3ff143ded04523cd015762d20f03;p=firefly-linux-kernel-4.4.55.git thp: vma_adjust_trans_huge(): adjust file-backed VMA too This series of patches adds support for using PMD page table entries to map DAX files. We expect NV-DIMMs to start showing up that are many gigabytes in size and the memory consumption of 4kB PTEs will be astronomical. The patch series leverages much of the Transparant Huge Pages infrastructure, going so far as to borrow one of Kirill's patches from his THP page cache series. This patch (of 10): Since we're going to have huge pages in page cache, we need to call adjust file-backed VMA, which potentially can contain huge pages. For now we call it for all VMAs. Probably later we will need to introduce a flag to indicate that the VMA has huge pages. Signed-off-by: Kirill A. Shutemov Signed-off-by: Matthew Wilcox Acked-by: Hillf Danton Cc: Theodore Ts'o Cc: Jan Kara Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index f10b20f05159..1c53c7d7ef7e 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -122,7 +122,7 @@ extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address, #endif extern int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, int advice); -extern void __vma_adjust_trans_huge(struct vm_area_struct *vma, +extern void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, unsigned long end, long adjust_next); @@ -138,15 +138,6 @@ static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma, else return 0; } -static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, - unsigned long start, - unsigned long end, - long adjust_next) -{ - if (!vma->anon_vma || vma->vm_ops) - return; - __vma_adjust_trans_huge(vma, start, end, adjust_next); -} static inline int hpage_nr_pages(struct page *page) { if (unlikely(PageTransHuge(page))) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 279a818a39b1..4d5fcb630d32 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2991,7 +2991,7 @@ static void split_huge_page_address(struct mm_struct *mm, split_huge_page_pmd_mm(mm, address, pmd); } -void __vma_adjust_trans_huge(struct vm_area_struct *vma, +void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, unsigned long end, long adjust_next)