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1 | #ifndef _LINUX_KHUGEPAGED_H |
2 | #define _LINUX_KHUGEPAGED_H | |
3 | ||
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4 | #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */ |
5 | ||
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6 | |
7 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
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8 | extern struct attribute_group khugepaged_attr_group; |
9 | ||
10 | extern int khugepaged_init(void); | |
11 | extern void khugepaged_destroy(void); | |
12 | extern int start_stop_khugepaged(void); | |
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13 | extern int __khugepaged_enter(struct mm_struct *mm); |
14 | extern void __khugepaged_exit(struct mm_struct *mm); | |
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15 | extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma, |
16 | unsigned long vm_flags); | |
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17 | |
18 | #define khugepaged_enabled() \ | |
19 | (transparent_hugepage_flags & \ | |
20 | ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \ | |
21 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))) | |
22 | #define khugepaged_always() \ | |
23 | (transparent_hugepage_flags & \ | |
24 | (1<<TRANSPARENT_HUGEPAGE_FLAG)) | |
25 | #define khugepaged_req_madv() \ | |
26 | (transparent_hugepage_flags & \ | |
27 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)) | |
28 | #define khugepaged_defrag() \ | |
29 | (transparent_hugepage_flags & \ | |
30 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG)) | |
31 | ||
32 | static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm) | |
33 | { | |
34 | if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags)) | |
35 | return __khugepaged_enter(mm); | |
36 | return 0; | |
37 | } | |
38 | ||
39 | static inline void khugepaged_exit(struct mm_struct *mm) | |
40 | { | |
41 | if (test_bit(MMF_VM_HUGEPAGE, &mm->flags)) | |
42 | __khugepaged_exit(mm); | |
43 | } | |
44 | ||
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45 | static inline int khugepaged_enter(struct vm_area_struct *vma, |
46 | unsigned long vm_flags) | |
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47 | { |
48 | if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags)) | |
a664b2d8 | 49 | if ((khugepaged_always() || |
6d50e60c DR |
50 | (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) && |
51 | !(vm_flags & VM_NOHUGEPAGE)) | |
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52 | if (__khugepaged_enter(vma->vm_mm)) |
53 | return -ENOMEM; | |
54 | return 0; | |
55 | } | |
56 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
57 | static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm) | |
58 | { | |
59 | return 0; | |
60 | } | |
61 | static inline void khugepaged_exit(struct mm_struct *mm) | |
62 | { | |
63 | } | |
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64 | static inline int khugepaged_enter(struct vm_area_struct *vma, |
65 | unsigned long vm_flags) | |
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66 | { |
67 | return 0; | |
68 | } | |
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69 | static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma, |
70 | unsigned long vm_flags) | |
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71 | { |
72 | return 0; | |
73 | } | |
74 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
75 | ||
76 | #endif /* _LINUX_KHUGEPAGED_H */ |