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