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ba76149f AA |
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); | |
6d50e60c DR |
9 | extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma, |
10 | unsigned long vm_flags); | |
ba76149f AA |
11 | |
12 | #define khugepaged_enabled() \ | |
13 | (transparent_hugepage_flags & \ | |
14 | ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \ | |
15 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))) | |
16 | #define khugepaged_always() \ | |
17 | (transparent_hugepage_flags & \ | |
18 | (1<<TRANSPARENT_HUGEPAGE_FLAG)) | |
19 | #define khugepaged_req_madv() \ | |
20 | (transparent_hugepage_flags & \ | |
21 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)) | |
22 | #define khugepaged_defrag() \ | |
23 | (transparent_hugepage_flags & \ | |
24 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG)) | |
25 | ||
26 | static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm) | |
27 | { | |
28 | if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags)) | |
29 | return __khugepaged_enter(mm); | |
30 | return 0; | |
31 | } | |
32 | ||
33 | static inline void khugepaged_exit(struct mm_struct *mm) | |
34 | { | |
35 | if (test_bit(MMF_VM_HUGEPAGE, &mm->flags)) | |
36 | __khugepaged_exit(mm); | |
37 | } | |
38 | ||
6d50e60c DR |
39 | static inline int khugepaged_enter(struct vm_area_struct *vma, |
40 | unsigned long vm_flags) | |
ba76149f AA |
41 | { |
42 | if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags)) | |
a664b2d8 | 43 | if ((khugepaged_always() || |
6d50e60c DR |
44 | (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) && |
45 | !(vm_flags & VM_NOHUGEPAGE)) | |
ba76149f AA |
46 | if (__khugepaged_enter(vma->vm_mm)) |
47 | return -ENOMEM; | |
48 | return 0; | |
49 | } | |
50 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
51 | static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm) | |
52 | { | |
53 | return 0; | |
54 | } | |
55 | static inline void khugepaged_exit(struct mm_struct *mm) | |
56 | { | |
57 | } | |
6d50e60c DR |
58 | static inline int khugepaged_enter(struct vm_area_struct *vma, |
59 | unsigned long vm_flags) | |
ba76149f AA |
60 | { |
61 | return 0; | |
62 | } | |
6d50e60c DR |
63 | static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma, |
64 | unsigned long vm_flags) | |
ba76149f AA |
65 | { |
66 | return 0; | |
67 | } | |
68 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
69 | ||
70 | #endif /* _LINUX_KHUGEPAGED_H */ |