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