include/linux/khugepaged.h

   1 #ifndef _LINUX_KHUGEPAGED_H
   2 #define _LINUX_KHUGEPAGED_H
   3
   4 #include <linux/sched.h> /* MMF_VM_HUGEPAGE */
   5
   6 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
   7 extern struct attribute_group khugepaged_attr_group;
   8
   9 extern int khugepaged_init(void);
  10 extern void khugepaged_destroy(void);
  11 extern int start_stop_khugepaged(void);
  12 extern int __khugepaged_enter(struct mm_struct *mm);
  13 extern void __khugepaged_exit(struct mm_struct *mm);
  14 extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
  15                                       unsigned long vm_flags);
  16
  17 #define khugepaged_enabled()                                           \
  18         (transparent_hugepage_flags &                                  \
  19          ((1<<TRANSPARENT_HUGEPAGE_FLAG) |                     \
  20           (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
  21 #define khugepaged_always()                             \
  22         (transparent_hugepage_flags &                   \
  23          (1<<TRANSPARENT_HUGEPAGE_FLAG))
  24 #define khugepaged_req_madv()                                   \
  25         (transparent_hugepage_flags &                           \
  26          (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
  27 #define khugepaged_defrag()                                     \
  28         (transparent_hugepage_flags &                           \
  29          (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
  30
  31 static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
  32 {
  33         if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
  34                 return __khugepaged_enter(mm);
  35         return 0;
  36 }
  37
  38 static inline void khugepaged_exit(struct mm_struct *mm)
  39 {
  40         if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
  41                 __khugepaged_exit(mm);
  42 }
  43
  44 static inline int khugepaged_enter(struct vm_area_struct *vma,
  45                                    unsigned long vm_flags)
  46 {
  47         if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
  48                 if ((khugepaged_always() ||
  49                      (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
  50                     !(vm_flags & VM_NOHUGEPAGE))
  51                         if (__khugepaged_enter(vma->vm_mm))
  52                                 return -ENOMEM;
  53         return 0;
  54 }
  55 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
  56 static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
  57 {
  58         return 0;
  59 }
  60 static inline void khugepaged_exit(struct mm_struct *mm)
  61 {
  62 }
  63 static inline int khugepaged_enter(struct vm_area_struct *vma,
  64                                    unsigned long vm_flags)
  65 {
  66         return 0;
  67 }
  68 static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
  69                                              unsigned long vm_flags)
  70 {
  71         return 0;
  72 }
  73 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  74
  75 #endif /* _LINUX_KHUGEPAGED_H */