Linux kernel mirror (for testing)
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linux
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
9extern struct attribute_group khugepaged_attr_group;
10
11extern int khugepaged_init(void);
12extern void khugepaged_destroy(void);
13extern int start_stop_khugepaged(void);
14extern int __khugepaged_enter(struct mm_struct *mm);
15extern void __khugepaged_exit(struct mm_struct *mm);
16extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
17 unsigned long vm_flags);
18extern void khugepaged_min_free_kbytes_update(void);
19#ifdef CONFIG_SHMEM
20extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
21#else
22static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
23 unsigned long addr)
24{
25}
26#endif
27
28#define khugepaged_enabled() \
29 (transparent_hugepage_flags & \
30 ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
31 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
32#define khugepaged_always() \
33 (transparent_hugepage_flags & \
34 (1<<TRANSPARENT_HUGEPAGE_FLAG))
35#define khugepaged_req_madv() \
36 (transparent_hugepage_flags & \
37 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
38#define khugepaged_defrag() \
39 (transparent_hugepage_flags & \
40 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
41
42static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
43{
44 if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
45 return __khugepaged_enter(mm);
46 return 0;
47}
48
49static inline void khugepaged_exit(struct mm_struct *mm)
50{
51 if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
52 __khugepaged_exit(mm);
53}
54
55static inline int khugepaged_enter(struct vm_area_struct *vma,
56 unsigned long vm_flags)
57{
58 if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
59 if ((khugepaged_always() ||
60 (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
61 !(vm_flags & VM_NOHUGEPAGE) &&
62 !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
63 if (__khugepaged_enter(vma->vm_mm))
64 return -ENOMEM;
65 return 0;
66}
67#else /* CONFIG_TRANSPARENT_HUGEPAGE */
68static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
69{
70 return 0;
71}
72static inline void khugepaged_exit(struct mm_struct *mm)
73{
74}
75static inline int khugepaged_enter(struct vm_area_struct *vma,
76 unsigned long vm_flags)
77{
78 return 0;
79}
80static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
81 unsigned long vm_flags)
82{
83 return 0;
84}
85static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
86 unsigned long addr)
87{
88}
89
90static inline void khugepaged_min_free_kbytes_update(void)
91{
92}
93#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
94
95#endif /* _LINUX_KHUGEPAGED_H */