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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 | |
b46e756f KS |
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); | |
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12 | extern int __khugepaged_enter(struct mm_struct *mm); |
13 | extern void __khugepaged_exit(struct mm_struct *mm); | |
6d50e60c DR |
14 | extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma, |
15 | unsigned long vm_flags); | |
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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 | ||
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44 | static inline int khugepaged_enter(struct vm_area_struct *vma, |
45 | unsigned long vm_flags) | |
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46 | { |
47 | if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags)) | |
a664b2d8 | 48 | if ((khugepaged_always() || |
6d50e60c DR |
49 | (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) && |
50 | !(vm_flags & VM_NOHUGEPAGE)) | |
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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 | } | |
6d50e60c DR |
63 | static inline int khugepaged_enter(struct vm_area_struct *vma, |
64 | unsigned long vm_flags) | |
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65 | { |
66 | return 0; | |
67 | } | |
6d50e60c DR |
68 | static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma, |
69 | unsigned long vm_flags) | |
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70 | { |
71 | return 0; | |
72 | } | |
73 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
74 | ||
75 | #endif /* _LINUX_KHUGEPAGED_H */ |