tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _LINUX_KHUGEPAGED_H
2#define _LINUX_KHUGEPAGED_H
3
4#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
5
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 int __khugepaged_enter(struct mm_struct *mm);
14extern void __khugepaged_exit(struct mm_struct *mm);
15extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
16 unsigned long vm_flags);
17
18#define khugepaged_enabled() \
19 (transparent_hugepage_flags & \
20 ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
21 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
22#define khugepaged_always() \
23 (transparent_hugepage_flags & \
24 (1<<TRANSPARENT_HUGEPAGE_FLAG))
25#define khugepaged_req_madv() \
26 (transparent_hugepage_flags & \
27 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
28#define khugepaged_defrag() \
29 (transparent_hugepage_flags & \
30 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
31
32static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
33{
34 if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
35 return __khugepaged_enter(mm);
36 return 0;
37}
38
39static inline void khugepaged_exit(struct mm_struct *mm)
40{
41 if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
42 __khugepaged_exit(mm);
43}
44
45static inline int khugepaged_enter(struct vm_area_struct *vma,
46 unsigned long vm_flags)
47{
48 if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
49 if ((khugepaged_always() ||
50 (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
51 !(vm_flags & VM_NOHUGEPAGE))
52 if (__khugepaged_enter(vma->vm_mm))
53 return -ENOMEM;
54 return 0;
55}
56#else /* CONFIG_TRANSPARENT_HUGEPAGE */
57static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
58{
59 return 0;
60}
61static inline void khugepaged_exit(struct mm_struct *mm)
62{
63}
64static inline int khugepaged_enter(struct vm_area_struct *vma,
65 unsigned long vm_flags)
66{
67 return 0;
68}
69static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
70 unsigned long vm_flags)
71{
72 return 0;
73}
74#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
75
76#endif /* _LINUX_KHUGEPAGED_H */