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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)) | |
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)) | |
a664b2d8 AA |
41 | if ((khugepaged_always() || |
42 | (khugepaged_req_madv() && | |
43 | vma->vm_flags & VM_HUGEPAGE)) && | |
44 | !(vma->vm_flags & VM_NOHUGEPAGE)) | |
ba76149f AA |
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 */ |