Release 4.7 include/linux/huge_mm.h

Directory: include/linux
#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 void huge_pmd_set_accessed(struct mm_struct *mm,
				  struct vm_area_struct *vma,
				  unsigned long address, pmd_t *pmd,
				  pmd_t orig_pmd, int dirty);
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 struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
					  unsigned long addr,
					  pmd_t *pmd,
					  unsigned int flags);
extern int madvise_free_huge_pmd(struct mmu_gather *tlb,
			struct vm_area_struct *vma,
			pmd_t *pmd, unsigned long addr, unsigned long next);
extern int zap_huge_pmd(struct mmu_gather *tlb,
			struct vm_area_struct *vma,
			pmd_t *pmd, unsigned long addr);
extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
			unsigned long addr, unsigned long end,
			unsigned char *vec);
extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
			 unsigned long new_addr, unsigned long old_end,
			 pmd_t *old_pmd, pmd_t *new_pmd);
extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
			unsigned long addr, pgprot_t newprot,
			int prot_numa);
int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
			pfn_t pfn, bool write);

enum transparent_hugepage_flag {
	
TRANSPARENT_HUGEPAGE_FLAG,
	
TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
	
TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
	
TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
	
TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
	
TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
	
TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
#ifdef CONFIG_DEBUG_VM
	
TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
#endif
};


#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)

#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
		pmd_t *pmd, int flags);


#define HPAGE_PMD_SHIFT PMD_SHIFT

#define HPAGE_PMD_SIZE	((1UL) << HPAGE_PMD_SHIFT)

#define HPAGE_PMD_MASK	(~(HPAGE_PMD_SIZE - 1))

extern bool is_vma_temporary_stack(struct vm_area_struct *vma);


#define transparent_hugepage_enabled(__vma)				\
	((transparent_hugepage_flags &                                  \
          (1<<TRANSPARENT_HUGEPAGE_FLAG) ||                             \
          (transparent_hugepage_flags &                                 \
           (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&                   \
           ((__vma)->vm_flags & VM_HUGEPAGE))) &&                       \
         !((__vma)->vm_flags & VM_NOHUGEPAGE) &&                        \
         !is_vma_temporary_stack(__vma))

#define transparent_hugepage_use_zero_page()				\
	(transparent_hugepage_flags &                                   \
         (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
#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 void prep_transhuge_page(struct page *page);
extern void free_transhuge_page(struct page *page);

int split_huge_page_to_list(struct page *page, struct list_head *list);


static inline int split_huge_page(struct page *page)
{
	return split_huge_page_to_list(page, NULL);
}
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void deferred_split_huge_page(struct page *page);

void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
		unsigned long address, bool freeze, struct page *page);


#define split_huge_pmd(__vma, __pmd, __address)				\
	do {                                                            \
                pmd_t *____pmd = (__pmd);                               \
                if (pmd_trans_huge(*____pmd)                            \
                                        || pmd_devmap(*____pmd))        \
                        __split_huge_pmd(__vma, __pmd, __address,       \
                                                false, NULL);           \
        }  while (0)


void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
		bool freeze, struct page *page);

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,
				    unsigned long start,
				    unsigned long end,
				    long adjust_next);
extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma);
/* mmap_sem must be held on entry */


static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma)
{
	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
		return __pmd_trans_huge_lock(pmd, vma);
	else
		return NULL;
}
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Total 59 100.00% 5 100.00%



static inline int hpage_nr_pages(struct page *page)
{
	if (unlikely(PageTransHuge(page)))
		return HPAGE_PMD_NR;
	return 1;
}

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extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
				unsigned long addr, pmd_t pmd, pmd_t *pmdp);

extern struct page *huge_zero_page;



static inline bool is_huge_zero_page(struct page *page)
{
	return ACCESS_ONCE(huge_zero_page) == page;
}

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static inline bool is_huge_zero_pmd(pmd_t pmd)
{
	return is_huge_zero_page(pmd_page(pmd));
}

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struct page *get_huge_zero_page(void);
void put_huge_zero_page(void);

#else /* CONFIG_TRANSPARENT_HUGEPAGE */

#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })

#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })

#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })


#define hpage_nr_pages(x) 1


#define transparent_hugepage_enabled(__vma) 0


#define transparent_hugepage_flags 0UL

static inline int

split_huge_page_to_list(struct page *page, struct list_head *list)
{
	return 0;
}
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static inline int split_huge_page(struct page *page)
{
	return 0;
}
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static inline void deferred_split_huge_page(struct page *page) {}
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#define split_huge_pmd(__vma, __pmd, __address)	\
	do { } while (0)



static inline void split_huge_pmd_address(struct vm_area_struct *vma,
		unsigned long address, bool freeze, struct page *page) {}

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static inline int hugepage_madvise(struct vm_area_struct *vma,
				   unsigned long *vm_flags, int advice)
{
	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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static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma)
{
	return NULL;
}

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static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
					unsigned long addr, pmd_t pmd, pmd_t *pmdp)
{
	return 0;
}

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static inline bool is_huge_zero_page(struct page *page)
{
	return false;
}

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static inline void put_huge_zero_page(void)
{
	BUILD_BUG();
}

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static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
		unsigned long addr, pmd_t *pmd, int flags)
{
	return NULL;
}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif /* _LINUX_HUGE_MM_H */
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mel gorman mel gorman 63 6.07% 4 8.89%
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  Directory: include/linux

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	Total	20	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 include/linux/huge_mm.h

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