1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_KHUGEPAGED_H
3 #define _LINUX_KHUGEPAGED_H
5 #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
7 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
8 extern struct attribute_group khugepaged_attr_group;
10 extern int khugepaged_init(void);
11 extern void khugepaged_destroy(void);
12 extern int start_stop_khugepaged(void);
13 extern bool hugepage_vma_check(struct vm_area_struct *vma,
14 unsigned long vm_flags);
15 extern void __khugepaged_enter(struct mm_struct *mm);
16 extern void __khugepaged_exit(struct mm_struct *mm);
17 extern void khugepaged_enter_vma(struct vm_area_struct *vma,
18 unsigned long vm_flags);
19 extern void khugepaged_min_free_kbytes_update(void);
21 extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
23 static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
29 #define khugepaged_enabled() \
30 (transparent_hugepage_flags & \
31 ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
32 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
33 #define khugepaged_always() \
34 (transparent_hugepage_flags & \
35 (1<<TRANSPARENT_HUGEPAGE_FLAG))
36 #define khugepaged_req_madv() \
37 (transparent_hugepage_flags & \
38 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
39 #define khugepaged_defrag() \
40 (transparent_hugepage_flags & \
41 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
43 static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
45 if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
46 __khugepaged_enter(mm);
49 static inline void khugepaged_exit(struct mm_struct *mm)
51 if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
52 __khugepaged_exit(mm);
55 static inline void khugepaged_enter(struct vm_area_struct *vma,
56 unsigned long vm_flags)
58 if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags) &&
59 khugepaged_enabled()) {
60 if (hugepage_vma_check(vma, vm_flags))
61 __khugepaged_enter(vma->vm_mm);
64 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
65 static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
68 static inline void khugepaged_exit(struct mm_struct *mm)
71 static inline void khugepaged_enter(struct vm_area_struct *vma,
72 unsigned long vm_flags)
75 static inline void khugepaged_enter_vma(struct vm_area_struct *vma,
76 unsigned long vm_flags)
79 static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
84 static inline void khugepaged_min_free_kbytes_update(void)
87 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
89 #endif /* _LINUX_KHUGEPAGED_H */