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include/linux/huge_mm.h 5.88 KB
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  #ifndef _LINUX_HUGE_MM_H
  #define _LINUX_HUGE_MM_H
  
  extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
  				      struct vm_area_struct *vma,
  				      unsigned long address, pmd_t *pmd,
  				      unsigned int flags);
  extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  			 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
  			 struct vm_area_struct *vma);
  extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
  			       unsigned long address, pmd_t *pmd,
  			       pmd_t orig_pmd);
  extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
  extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
  					  unsigned long addr,
  					  pmd_t *pmd,
  					  unsigned int flags);
  extern int zap_huge_pmd(struct mmu_gather *tlb,
  			struct vm_area_struct *vma,
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  			pmd_t *pmd, unsigned long addr);
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  extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  			unsigned long addr, unsigned long end,
  			unsigned char *vec);
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  extern int move_huge_pmd(struct vm_area_struct *vma,
  			 struct vm_area_struct *new_vma,
  			 unsigned long old_addr,
  			 unsigned long new_addr, unsigned long old_end,
  			 pmd_t *old_pmd, pmd_t *new_pmd);
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  extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  			unsigned long addr, pgprot_t newprot);
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  enum transparent_hugepage_flag {
  	TRANSPARENT_HUGEPAGE_FLAG,
  	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
  	TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
  	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
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  	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
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  #ifdef CONFIG_DEBUG_VM
  	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
  #endif
  };
  
  enum page_check_address_pmd_flag {
  	PAGE_CHECK_ADDRESS_PMD_FLAG,
  	PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
  	PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
  };
  extern pmd_t *page_check_address_pmd(struct page *page,
  				     struct mm_struct *mm,
  				     unsigned long address,
  				     enum page_check_address_pmd_flag flag);
  
  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  #define HPAGE_PMD_SHIFT HPAGE_SHIFT
  #define HPAGE_PMD_MASK HPAGE_MASK
  #define HPAGE_PMD_SIZE HPAGE_SIZE
  
  #define transparent_hugepage_enabled(__vma)				\
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  	((transparent_hugepage_flags &					\
  	  (1<<TRANSPARENT_HUGEPAGE_FLAG) ||				\
  	  (transparent_hugepage_flags &					\
  	   (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&			\
  	   ((__vma)->vm_flags & VM_HUGEPAGE))) &&			\
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  	 !((__vma)->vm_flags & VM_NOHUGEPAGE) &&			\
  	 !is_vma_temporary_stack(__vma))
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  #define transparent_hugepage_defrag(__vma)				\
  	((transparent_hugepage_flags &					\
  	  (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) ||			\
  	 (transparent_hugepage_flags &					\
  	  (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) &&		\
  	  (__vma)->vm_flags & VM_HUGEPAGE))
  #ifdef CONFIG_DEBUG_VM
  #define transparent_hugepage_debug_cow()				\
  	(transparent_hugepage_flags &					\
  	 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
  #else /* CONFIG_DEBUG_VM */
  #define transparent_hugepage_debug_cow() 0
  #endif /* CONFIG_DEBUG_VM */
  
  extern unsigned long transparent_hugepage_flags;
  extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  			  pmd_t *dst_pmd, pmd_t *src_pmd,
  			  struct vm_area_struct *vma,
  			  unsigned long addr, unsigned long end);
  extern int handle_pte_fault(struct mm_struct *mm,
  			    struct vm_area_struct *vma, unsigned long address,
  			    pte_t *pte, pmd_t *pmd, unsigned int flags);
  extern int split_huge_page(struct page *page);
  extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
  #define split_huge_page_pmd(__mm, __pmd)				\
  	do {								\
  		pmd_t *____pmd = (__pmd);				\
  		if (unlikely(pmd_trans_huge(*____pmd)))			\
  			__split_huge_page_pmd(__mm, ____pmd);		\
  	}  while (0)
  #define wait_split_huge_page(__anon_vma, __pmd)				\
  	do {								\
  		pmd_t *____pmd = (__pmd);				\
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  		anon_vma_lock(__anon_vma);				\
  		anon_vma_unlock(__anon_vma);				\
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  		BUG_ON(pmd_trans_splitting(*____pmd) ||			\
  		       pmd_trans_huge(*____pmd));			\
  	} while (0)
  #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
  #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
  #if HPAGE_PMD_ORDER > MAX_ORDER
  #error "hugepages can't be allocated by the buddy allocator"
  #endif
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  extern int hugepage_madvise(struct vm_area_struct *vma,
  			    unsigned long *vm_flags, int advice);
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  extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
  				    unsigned long start,
  				    unsigned long end,
  				    long adjust_next);
  static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
  					 unsigned long start,
  					 unsigned long end,
  					 long adjust_next)
  {
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  	if (!vma->anon_vma || vma->vm_ops)
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  		return;
  	__vma_adjust_trans_huge(vma, start, end, adjust_next);
  }
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  static inline int hpage_nr_pages(struct page *page)
  {
  	if (unlikely(PageTransHuge(page)))
  		return HPAGE_PMD_NR;
  	return 1;
  }
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  static inline struct page *compound_trans_head(struct page *page)
  {
  	if (PageTail(page)) {
  		struct page *head;
  		head = page->first_page;
  		smp_rmb();
  		/*
  		 * head may be a dangling pointer.
  		 * __split_huge_page_refcount clears PageTail before
  		 * overwriting first_page, so if PageTail is still
  		 * there it means the head pointer isn't dangling.
  		 */
  		if (PageTail(page))
  			return head;
  	}
  	return page;
  }
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  #else /* CONFIG_TRANSPARENT_HUGEPAGE */
  #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
  #define HPAGE_PMD_MASK ({ BUG(); 0; })
  #define HPAGE_PMD_SIZE ({ BUG(); 0; })
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  #define hpage_nr_pages(x) 1
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  #define transparent_hugepage_enabled(__vma) 0
  
  #define transparent_hugepage_flags 0UL
  static inline int split_huge_page(struct page *page)
  {
  	return 0;
  }
  #define split_huge_page_pmd(__mm, __pmd)	\
  	do { } while (0)
  #define wait_split_huge_page(__anon_vma, __pmd)	\
  	do { } while (0)
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  #define compound_trans_head(page) compound_head(page)
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  static inline int hugepage_madvise(struct vm_area_struct *vma,
  				   unsigned long *vm_flags, int advice)
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  {
  	BUG();
  	return 0;
  }
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  static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
  					 unsigned long start,
  					 unsigned long end,
  					 long adjust_next)
  {
  }
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  #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  
  #endif /* _LINUX_HUGE_MM_H */