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huge_mm.h
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1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
3 
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,
7  unsigned int flags);
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 int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
12  unsigned long address, pmd_t *pmd,
13  pmd_t orig_pmd);
14 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
15  unsigned long addr,
16  pmd_t *pmd,
17  unsigned int flags);
18 extern int zap_huge_pmd(struct mmu_gather *tlb,
19  struct vm_area_struct *vma,
20  pmd_t *pmd, unsigned long addr);
21 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
22  unsigned long addr, unsigned long end,
23  unsigned char *vec);
24 extern int move_huge_pmd(struct vm_area_struct *vma,
25  struct vm_area_struct *new_vma,
26  unsigned long old_addr,
27  unsigned long new_addr, unsigned long old_end,
28  pmd_t *old_pmd, pmd_t *new_pmd);
29 extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
30  unsigned long addr, pgprot_t newprot);
31 
32 enum transparent_hugepage_flag {
33  TRANSPARENT_HUGEPAGE_FLAG,
34  TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
35  TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
36  TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
37  TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
38 #ifdef CONFIG_DEBUG_VM
39  TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
40 #endif
41 };
42 
43 enum page_check_address_pmd_flag {
44  PAGE_CHECK_ADDRESS_PMD_FLAG,
45  PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
46  PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
47 };
48 extern pmd_t *page_check_address_pmd(struct page *page,
49  struct mm_struct *mm,
50  unsigned long address,
51  enum page_check_address_pmd_flag flag);
52 
53 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
54 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
55 
56 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
57 #define HPAGE_PMD_SHIFT HPAGE_SHIFT
58 #define HPAGE_PMD_MASK HPAGE_MASK
59 #define HPAGE_PMD_SIZE HPAGE_SIZE
60 
61 extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
62 
63 #define transparent_hugepage_enabled(__vma) \
64  ((transparent_hugepage_flags & \
65  (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
66  (transparent_hugepage_flags & \
67  (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
68  ((__vma)->vm_flags & VM_HUGEPAGE))) && \
69  !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
70  !is_vma_temporary_stack(__vma))
71 #define transparent_hugepage_defrag(__vma) \
72  ((transparent_hugepage_flags & \
73  (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
74  (transparent_hugepage_flags & \
75  (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
76  (__vma)->vm_flags & VM_HUGEPAGE))
77 #ifdef CONFIG_DEBUG_VM
78 #define transparent_hugepage_debug_cow() \
79  (transparent_hugepage_flags & \
80  (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
81 #else /* CONFIG_DEBUG_VM */
82 #define transparent_hugepage_debug_cow() 0
83 #endif /* CONFIG_DEBUG_VM */
84 
85 extern unsigned long transparent_hugepage_flags;
86 extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
87  pmd_t *dst_pmd, pmd_t *src_pmd,
88  struct vm_area_struct *vma,
89  unsigned long addr, unsigned long end);
90 extern int handle_pte_fault(struct mm_struct *mm,
91  struct vm_area_struct *vma, unsigned long address,
92  pte_t *pte, pmd_t *pmd, unsigned int flags);
93 extern int split_huge_page(struct page *page);
94 extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
95 #define split_huge_page_pmd(__mm, __pmd) \
96  do { \
97  pmd_t *____pmd = (__pmd); \
98  if (unlikely(pmd_trans_huge(*____pmd))) \
99  __split_huge_page_pmd(__mm, ____pmd); \
100  } while (0)
101 #define wait_split_huge_page(__anon_vma, __pmd) \
102  do { \
103  pmd_t *____pmd = (__pmd); \
104  anon_vma_lock(__anon_vma); \
105  anon_vma_unlock(__anon_vma); \
106  BUG_ON(pmd_trans_splitting(*____pmd) || \
107  pmd_trans_huge(*____pmd)); \
108  } while (0)
109 #if HPAGE_PMD_ORDER > MAX_ORDER
110 #error "hugepages can't be allocated by the buddy allocator"
111 #endif
112 extern int hugepage_madvise(struct vm_area_struct *vma,
113  unsigned long *vm_flags, int advice);
114 extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
115  unsigned long start,
116  unsigned long end,
117  long adjust_next);
118 extern int __pmd_trans_huge_lock(pmd_t *pmd,
119  struct vm_area_struct *vma);
120 /* mmap_sem must be held on entry */
121 static inline int pmd_trans_huge_lock(pmd_t *pmd,
122  struct vm_area_struct *vma)
123 {
124  VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
125  if (pmd_trans_huge(*pmd))
126  return __pmd_trans_huge_lock(pmd, vma);
127  else
128  return 0;
129 }
130 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
131  unsigned long start,
132  unsigned long end,
133  long adjust_next)
134 {
135  if (!vma->anon_vma || vma->vm_ops)
136  return;
137  __vma_adjust_trans_huge(vma, start, end, adjust_next);
138 }
139 static inline int hpage_nr_pages(struct page *page)
140 {
141  if (unlikely(PageTransHuge(page)))
142  return HPAGE_PMD_NR;
143  return 1;
144 }
145 static inline struct page *compound_trans_head(struct page *page)
146 {
147  if (PageTail(page)) {
148  struct page *head;
149  head = page->first_page;
150  smp_rmb();
151  /*
152  * head may be a dangling pointer.
153  * __split_huge_page_refcount clears PageTail before
154  * overwriting first_page, so if PageTail is still
155  * there it means the head pointer isn't dangling.
156  */
157  if (PageTail(page))
158  return head;
159  }
160  return page;
161 }
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; })
166 
167 #define hpage_nr_pages(x) 1
168 
169 #define transparent_hugepage_enabled(__vma) 0
170 
171 #define transparent_hugepage_flags 0UL
172 static inline int split_huge_page(struct page *page)
173 {
174  return 0;
175 }
176 #define split_huge_page_pmd(__mm, __pmd) \
177  do { } while (0)
178 #define wait_split_huge_page(__anon_vma, __pmd) \
179  do { } while (0)
180 #define compound_trans_head(page) compound_head(page)
181 static inline int hugepage_madvise(struct vm_area_struct *vma,
182  unsigned long *vm_flags, int advice)
183 {
184  BUG();
185  return 0;
186 }
187 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
188  unsigned long start,
189  unsigned long end,
190  long adjust_next)
191 {
192 }
193 static inline int pmd_trans_huge_lock(pmd_t *pmd,
194  struct vm_area_struct *vma)
195 {
196  return 0;
197 }
198 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
199 
200 #endif /* _LINUX_HUGE_MM_H */
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