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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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
8extern struct attribute_group khugepaged_attr_group;
9
10extern int khugepaged_init(void);
11extern void khugepaged_destroy(void);
12extern int start_stop_khugepaged(void);
13extern void __khugepaged_enter(struct mm_struct *mm);
14extern void __khugepaged_exit(struct mm_struct *mm);
15extern void khugepaged_enter_vma(struct vm_area_struct *vma,
16 unsigned long vm_flags);
17extern void khugepaged_min_free_kbytes_update(void);
18extern bool current_is_khugepaged(void);
19#ifdef CONFIG_SHMEM
20extern int collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr,
21 bool install_pmd);
22#else
23static inline int collapse_pte_mapped_thp(struct mm_struct *mm,
24 unsigned long addr, bool install_pmd)
25{
26 return 0;
27}
28#endif
29
30static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
31{
32 if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
33 __khugepaged_enter(mm);
34}
35
36static inline void khugepaged_exit(struct mm_struct *mm)
37{
38 if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
39 __khugepaged_exit(mm);
40}
41#else /* CONFIG_TRANSPARENT_HUGEPAGE */
42static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
43{
44}
45static inline void khugepaged_exit(struct mm_struct *mm)
46{
47}
48static inline void khugepaged_enter_vma(struct vm_area_struct *vma,
49 unsigned long vm_flags)
50{
51}
52static inline int collapse_pte_mapped_thp(struct mm_struct *mm,
53 unsigned long addr, bool install_pmd)
54{
55 return 0;
56}
57
58static inline void khugepaged_min_free_kbytes_update(void)
59{
60}
61
62static inline bool current_is_khugepaged(void)
63{
64 return false;
65}
66#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
67
68#endif /* _LINUX_KHUGEPAGED_H */
69

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source code of linux/include/linux/khugepaged.h