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