1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_KHUGEPAGED_H
3 #define _LINUX_KHUGEPAGED_H
4
5 #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
6
7
8 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
9 extern struct attribute_group khugepaged_attr_group;
10
11 extern int khugepaged_init(void);
12 extern void khugepaged_destroy(void);
13 extern int start_stop_khugepaged(void);
14 extern int __khugepaged_enter(struct mm_struct *mm);
15 extern void __khugepaged_exit(struct mm_struct *mm);
16 extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
17 unsigned long vm_flags);
18 extern void khugepaged_min_free_kbytes_update(void);
19
20 #define khugepaged_enabled() \
21 (transparent_hugepage_flags & \
22 ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
23 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
24 #define khugepaged_always() \
25 (transparent_hugepage_flags & \
26 (1<<TRANSPARENT_HUGEPAGE_FLAG))
27 #define khugepaged_req_madv() \
28 (transparent_hugepage_flags & \
29 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
30 #define khugepaged_defrag() \
31 (transparent_hugepage_flags & \
32 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
33
khugepaged_fork(struct mm_struct * mm,struct mm_struct * oldmm)34 static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
35 {
36 if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
37 return __khugepaged_enter(mm);
38 return 0;
39 }
40
khugepaged_exit(struct mm_struct * mm)41 static inline void khugepaged_exit(struct mm_struct *mm)
42 {
43 if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
44 __khugepaged_exit(mm);
45 }
46
khugepaged_enter(struct vm_area_struct * vma,unsigned long vm_flags)47 static inline int khugepaged_enter(struct vm_area_struct *vma,
48 unsigned long vm_flags)
49 {
50 if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
51 if ((khugepaged_always() ||
52 (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
53 !(vm_flags & VM_NOHUGEPAGE) &&
54 !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
55 if (__khugepaged_enter(vma->vm_mm))
56 return -ENOMEM;
57 return 0;
58 }
59 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
khugepaged_fork(struct mm_struct * mm,struct mm_struct * oldmm)60 static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
61 {
62 return 0;
63 }
khugepaged_exit(struct mm_struct * mm)64 static inline void khugepaged_exit(struct mm_struct *mm)
65 {
66 }
khugepaged_enter(struct vm_area_struct * vma,unsigned long vm_flags)67 static inline int khugepaged_enter(struct vm_area_struct *vma,
68 unsigned long vm_flags)
69 {
70 return 0;
71 }
khugepaged_enter_vma_merge(struct vm_area_struct * vma,unsigned long vm_flags)72 static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
73 unsigned long vm_flags)
74 {
75 return 0;
76 }
77
khugepaged_min_free_kbytes_update(void)78 static inline void khugepaged_min_free_kbytes_update(void)
79 {
80 }
81 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
82
83 #endif /* _LINUX_KHUGEPAGED_H */
84