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khugepaged.h
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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))
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 */