huge_mm.h 5.1 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157
  1. #ifndef _LINUX_HUGE_MM_H
  2. #define _LINUX_HUGE_MM_H
  3. extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
  4. struct vm_area_struct *vma,
  5. unsigned long address, pmd_t *pmd,
  6. unsigned int flags);
  7. extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  8. pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
  9. struct vm_area_struct *vma);
  10. extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
  11. unsigned long address, pmd_t *pmd,
  12. pmd_t orig_pmd);
  13. extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
  14. extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
  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);
  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 change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
  25. unsigned long addr, pgprot_t newprot);
  26. enum transparent_hugepage_flag {
  27. TRANSPARENT_HUGEPAGE_FLAG,
  28. TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
  29. TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
  30. TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
  31. TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
  32. #ifdef CONFIG_DEBUG_VM
  33. TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
  34. #endif
  35. };
  36. enum page_check_address_pmd_flag {
  37. PAGE_CHECK_ADDRESS_PMD_FLAG,
  38. PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
  39. PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
  40. };
  41. extern pmd_t *page_check_address_pmd(struct page *page,
  42. struct mm_struct *mm,
  43. unsigned long address,
  44. enum page_check_address_pmd_flag flag);
  45. #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  46. #define HPAGE_PMD_SHIFT HPAGE_SHIFT
  47. #define HPAGE_PMD_MASK HPAGE_MASK
  48. #define HPAGE_PMD_SIZE HPAGE_SIZE
  49. #define transparent_hugepage_enabled(__vma) \
  50. (transparent_hugepage_flags & (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
  51. (transparent_hugepage_flags & \
  52. (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
  53. (__vma)->vm_flags & VM_HUGEPAGE))
  54. #define transparent_hugepage_defrag(__vma) \
  55. ((transparent_hugepage_flags & \
  56. (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
  57. (transparent_hugepage_flags & \
  58. (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
  59. (__vma)->vm_flags & VM_HUGEPAGE))
  60. #ifdef CONFIG_DEBUG_VM
  61. #define transparent_hugepage_debug_cow() \
  62. (transparent_hugepage_flags & \
  63. (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
  64. #else /* CONFIG_DEBUG_VM */
  65. #define transparent_hugepage_debug_cow() 0
  66. #endif /* CONFIG_DEBUG_VM */
  67. extern unsigned long transparent_hugepage_flags;
  68. extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
  69. pmd_t *dst_pmd, pmd_t *src_pmd,
  70. struct vm_area_struct *vma,
  71. unsigned long addr, unsigned long end);
  72. extern int handle_pte_fault(struct mm_struct *mm,
  73. struct vm_area_struct *vma, unsigned long address,
  74. pte_t *pte, pmd_t *pmd, unsigned int flags);
  75. extern int split_huge_page(struct page *page);
  76. extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
  77. #define split_huge_page_pmd(__mm, __pmd) \
  78. do { \
  79. pmd_t *____pmd = (__pmd); \
  80. if (unlikely(pmd_trans_huge(*____pmd))) \
  81. __split_huge_page_pmd(__mm, ____pmd); \
  82. } while (0)
  83. #define wait_split_huge_page(__anon_vma, __pmd) \
  84. do { \
  85. pmd_t *____pmd = (__pmd); \
  86. spin_unlock_wait(&(__anon_vma)->root->lock); \
  87. /* \
  88. * spin_unlock_wait() is just a loop in C and so the \
  89. * CPU can reorder anything around it. \
  90. */ \
  91. smp_mb(); \
  92. BUG_ON(pmd_trans_splitting(*____pmd) || \
  93. pmd_trans_huge(*____pmd)); \
  94. } while (0)
  95. #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
  96. #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
  97. #if HPAGE_PMD_ORDER > MAX_ORDER
  98. #error "hugepages can't be allocated by the buddy allocator"
  99. #endif
  100. extern int hugepage_madvise(unsigned long *vm_flags);
  101. extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
  102. unsigned long start,
  103. unsigned long end,
  104. long adjust_next);
  105. static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
  106. unsigned long start,
  107. unsigned long end,
  108. long adjust_next)
  109. {
  110. if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
  111. return;
  112. __vma_adjust_trans_huge(vma, start, end, adjust_next);
  113. }
  114. static inline int hpage_nr_pages(struct page *page)
  115. {
  116. if (unlikely(PageTransHuge(page)))
  117. return HPAGE_PMD_NR;
  118. return 1;
  119. }
  120. #else /* CONFIG_TRANSPARENT_HUGEPAGE */
  121. #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
  122. #define HPAGE_PMD_MASK ({ BUG(); 0; })
  123. #define HPAGE_PMD_SIZE ({ BUG(); 0; })
  124. #define hpage_nr_pages(x) 1
  125. #define transparent_hugepage_enabled(__vma) 0
  126. #define transparent_hugepage_flags 0UL
  127. static inline int split_huge_page(struct page *page)
  128. {
  129. return 0;
  130. }
  131. #define split_huge_page_pmd(__mm, __pmd) \
  132. do { } while (0)
  133. #define wait_split_huge_page(__anon_vma, __pmd) \
  134. do { } while (0)
  135. static inline int hugepage_madvise(unsigned long *vm_flags)
  136. {
  137. BUG();
  138. return 0;
  139. }
  140. static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
  141. unsigned long start,
  142. unsigned long end,
  143. long adjust_next)
  144. {
  145. }
  146. #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  147. #endif /* _LINUX_HUGE_MM_H */