1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
4 extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
5 struct vm_area_struct *vma,
6 unsigned long address, pmd_t *pmd,
8 extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
9 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
10 struct vm_area_struct *vma);
11 extern void huge_pmd_set_accessed(struct mm_struct *mm,
12 struct vm_area_struct *vma,
13 unsigned long address, pmd_t *pmd,
14 pmd_t orig_pmd, int dirty);
15 extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
16 unsigned long address, pmd_t *pmd,
18 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
22 extern int madvise_free_huge_pmd(struct mmu_gather *tlb,
23 struct vm_area_struct *vma,
24 pmd_t *pmd, unsigned long addr);
25 extern int zap_huge_pmd(struct mmu_gather *tlb,
26 struct vm_area_struct *vma,
27 pmd_t *pmd, unsigned long addr);
28 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
29 unsigned long addr, unsigned long end,
31 extern bool move_huge_pmd(struct vm_area_struct *vma,
32 struct vm_area_struct *new_vma,
33 unsigned long old_addr,
34 unsigned long new_addr, unsigned long old_end,
35 pmd_t *old_pmd, pmd_t *new_pmd);
36 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
37 unsigned long addr, pgprot_t newprot,
39 int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
40 unsigned long pfn, bool write);
42 enum transparent_hugepage_flag {
43 TRANSPARENT_HUGEPAGE_FLAG,
44 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
45 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
46 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
47 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
48 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
49 #ifdef CONFIG_DEBUG_VM
50 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
54 extern pmd_t *page_check_address_pmd(struct page *page,
56 unsigned long address,
58 extern int pmd_freeable(pmd_t pmd);
60 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
61 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
63 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
64 #define HPAGE_PMD_SHIFT PMD_SHIFT
65 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
66 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
68 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
70 #define transparent_hugepage_enabled(__vma) \
71 ((transparent_hugepage_flags & \
72 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
73 (transparent_hugepage_flags & \
74 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
75 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
76 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
77 !is_vma_temporary_stack(__vma))
78 #define transparent_hugepage_defrag(__vma) \
79 ((transparent_hugepage_flags & \
80 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
81 (transparent_hugepage_flags & \
82 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
83 (__vma)->vm_flags & VM_HUGEPAGE))
84 #define transparent_hugepage_use_zero_page() \
85 (transparent_hugepage_flags & \
86 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
87 #ifdef CONFIG_DEBUG_VM
88 #define transparent_hugepage_debug_cow() \
89 (transparent_hugepage_flags & \
90 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
91 #else /* CONFIG_DEBUG_VM */
92 #define transparent_hugepage_debug_cow() 0
93 #endif /* CONFIG_DEBUG_VM */
95 extern unsigned long transparent_hugepage_flags;
97 extern void prep_transhuge_page(struct page *page);
98 extern void free_transhuge_page(struct page *page);
100 int split_huge_page_to_list(struct page *page, struct list_head *list);
101 static inline int split_huge_page(struct page *page)
103 return split_huge_page_to_list(page, NULL);
105 void deferred_split_huge_page(struct page *page);
107 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
108 unsigned long address);
110 #define split_huge_pmd(__vma, __pmd, __address) \
112 pmd_t *____pmd = (__pmd); \
113 if (pmd_trans_huge(*____pmd)) \
114 __split_huge_pmd(__vma, __pmd, __address); \
117 #if HPAGE_PMD_ORDER >= MAX_ORDER
118 #error "hugepages can't be allocated by the buddy allocator"
120 extern int hugepage_madvise(struct vm_area_struct *vma,
121 unsigned long *vm_flags, int advice);
122 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
126 extern bool __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
128 /* mmap_sem must be held on entry */
129 static inline bool pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
132 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
133 if (pmd_trans_huge(*pmd))
134 return __pmd_trans_huge_lock(pmd, vma, ptl);
138 static inline int hpage_nr_pages(struct page *page)
140 if (unlikely(PageTransHuge(page)))
145 extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
146 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
148 extern struct page *huge_zero_page;
150 static inline bool is_huge_zero_page(struct page *page)
152 return ACCESS_ONCE(huge_zero_page) == page;
155 static inline bool is_huge_zero_pmd(pmd_t pmd)
157 return is_huge_zero_page(pmd_page(pmd));
160 struct page *get_huge_zero_page(void);
162 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
163 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
164 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
165 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
167 #define hpage_nr_pages(x) 1
169 #define transparent_hugepage_enabled(__vma) 0
171 #define transparent_hugepage_flags 0UL
173 split_huge_page_to_list(struct page *page, struct list_head *list)
177 static inline int split_huge_page(struct page *page)
181 static inline void deferred_split_huge_page(struct page *page) {}
182 #define split_huge_pmd(__vma, __pmd, __address) \
184 static inline int hugepage_madvise(struct vm_area_struct *vma,
185 unsigned long *vm_flags, int advice)
190 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
196 static inline bool pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
202 static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
203 unsigned long addr, pmd_t pmd, pmd_t *pmdp)
208 static inline bool is_huge_zero_page(struct page *page)
213 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
215 #endif /* _LINUX_HUGE_MM_H */