1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _LINUX_KHUGEPAGED_H
3*4882a593Smuzhiyun #define _LINUX_KHUGEPAGED_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
6*4882a593Smuzhiyun #include <linux/shmem_fs.h>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #ifdef CONFIG_TRANSPARENT_HUGEPAGE
10*4882a593Smuzhiyun extern struct attribute_group khugepaged_attr_group;
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun extern int khugepaged_init(void);
13*4882a593Smuzhiyun extern void khugepaged_destroy(void);
14*4882a593Smuzhiyun extern int start_stop_khugepaged(void);
15*4882a593Smuzhiyun extern int __khugepaged_enter(struct mm_struct *mm);
16*4882a593Smuzhiyun extern void __khugepaged_exit(struct mm_struct *mm);
17*4882a593Smuzhiyun extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
18*4882a593Smuzhiyun unsigned long vm_flags);
19*4882a593Smuzhiyun extern void khugepaged_min_free_kbytes_update(void);
20*4882a593Smuzhiyun #ifdef CONFIG_SHMEM
21*4882a593Smuzhiyun extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
22*4882a593Smuzhiyun #else
collapse_pte_mapped_thp(struct mm_struct * mm,unsigned long addr)23*4882a593Smuzhiyun static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
24*4882a593Smuzhiyun unsigned long addr)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun #endif
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun #define khugepaged_enabled() \
30*4882a593Smuzhiyun (transparent_hugepage_flags & \
31*4882a593Smuzhiyun ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
32*4882a593Smuzhiyun (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
33*4882a593Smuzhiyun #define khugepaged_always() \
34*4882a593Smuzhiyun (transparent_hugepage_flags & \
35*4882a593Smuzhiyun (1<<TRANSPARENT_HUGEPAGE_FLAG))
36*4882a593Smuzhiyun #define khugepaged_req_madv() \
37*4882a593Smuzhiyun (transparent_hugepage_flags & \
38*4882a593Smuzhiyun (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
39*4882a593Smuzhiyun #define khugepaged_defrag() \
40*4882a593Smuzhiyun (transparent_hugepage_flags & \
41*4882a593Smuzhiyun (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
42*4882a593Smuzhiyun
khugepaged_fork(struct mm_struct * mm,struct mm_struct * oldmm)43*4882a593Smuzhiyun static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
46*4882a593Smuzhiyun return __khugepaged_enter(mm);
47*4882a593Smuzhiyun return 0;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
khugepaged_exit(struct mm_struct * mm)50*4882a593Smuzhiyun static inline void khugepaged_exit(struct mm_struct *mm)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
53*4882a593Smuzhiyun __khugepaged_exit(mm);
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
khugepaged_enter(struct vm_area_struct * vma,unsigned long vm_flags)56*4882a593Smuzhiyun static inline int khugepaged_enter(struct vm_area_struct *vma,
57*4882a593Smuzhiyun unsigned long vm_flags)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
60*4882a593Smuzhiyun if ((khugepaged_always() ||
61*4882a593Smuzhiyun (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) ||
62*4882a593Smuzhiyun (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
63*4882a593Smuzhiyun !(vm_flags & VM_NOHUGEPAGE) &&
64*4882a593Smuzhiyun !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
65*4882a593Smuzhiyun if (__khugepaged_enter(vma->vm_mm))
66*4882a593Smuzhiyun return -ENOMEM;
67*4882a593Smuzhiyun return 0;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun #else /* CONFIG_TRANSPARENT_HUGEPAGE */
khugepaged_fork(struct mm_struct * mm,struct mm_struct * oldmm)70*4882a593Smuzhiyun static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun return 0;
73*4882a593Smuzhiyun }
khugepaged_exit(struct mm_struct * mm)74*4882a593Smuzhiyun static inline void khugepaged_exit(struct mm_struct *mm)
75*4882a593Smuzhiyun {
76*4882a593Smuzhiyun }
khugepaged_enter(struct vm_area_struct * vma,unsigned long vm_flags)77*4882a593Smuzhiyun static inline int khugepaged_enter(struct vm_area_struct *vma,
78*4882a593Smuzhiyun unsigned long vm_flags)
79*4882a593Smuzhiyun {
80*4882a593Smuzhiyun return 0;
81*4882a593Smuzhiyun }
khugepaged_enter_vma_merge(struct vm_area_struct * vma,unsigned long vm_flags)82*4882a593Smuzhiyun static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
83*4882a593Smuzhiyun unsigned long vm_flags)
84*4882a593Smuzhiyun {
85*4882a593Smuzhiyun return 0;
86*4882a593Smuzhiyun }
collapse_pte_mapped_thp(struct mm_struct * mm,unsigned long addr)87*4882a593Smuzhiyun static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
88*4882a593Smuzhiyun unsigned long addr)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
khugepaged_min_free_kbytes_update(void)92*4882a593Smuzhiyun static inline void khugepaged_min_free_kbytes_update(void)
93*4882a593Smuzhiyun {
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun #endif /* _LINUX_KHUGEPAGED_H */
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