Gitiles
Code Review Sign In
review.shift-gmbh.com / SHIFTPHONES / kernel / shift / mainline / 5a56a39be7ffb416dd5ec5e1489d5a3a8b6a63f2 / . / include / linux / khugepaged.h
blob: bc45ea1efbf7973362c6cb99b433ecba4f95612a [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +0100[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0 */
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]2#ifndef _LINUX_KHUGEPAGED_H
3#define _LINUX_KHUGEPAGED_H
4
Ingo Molnarf7ccbae2017-02-08 18:51:30 +0100[diff] [blame]5#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
6
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]7
8#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Kirill A. Shutemovb46e7562016-07-26 15:26:24 -0700[diff] [blame]9extern struct attribute_group khugepaged_attr_group;
10
11extern int khugepaged_init(void);
12extern void khugepaged_destroy(void);
13extern int start_stop_khugepaged(void);
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]14extern int __khugepaged_enter(struct mm_struct *mm);
15extern void __khugepaged_exit(struct mm_struct *mm);
David Rientjes6d50e602014-10-29 14:50:31 -0700[diff] [blame]16extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
17 unsigned long vm_flags);
Song Liu27e1f822019-09-23 15:38:30 -0700[diff] [blame]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
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]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
David Rientjes6d50e602014-10-29 14:50:31 -0700[diff] [blame]54static inline int khugepaged_enter(struct vm_area_struct *vma,
55 unsigned long vm_flags)
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]56{
57 if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
Andrea Arcangelia664b2d2011-01-13 15:47:17 -0800[diff] [blame]58 if ((khugepaged_always() ||
David Rientjes6d50e602014-10-29 14:50:31 -0700[diff] [blame]59 (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
Michal Hocko18600332017-07-10 15:48:02 -0700[diff] [blame]60 !(vm_flags & VM_NOHUGEPAGE) &&
61 !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]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}
David Rientjes6d50e602014-10-29 14:50:31 -0700[diff] [blame]74static inline int khugepaged_enter(struct vm_area_struct *vma,
75 unsigned long vm_flags)
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]76{
77 return 0;
78}
David Rientjes6d50e602014-10-29 14:50:31 -0700[diff] [blame]79static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
80 unsigned long vm_flags)
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]81{
82 return 0;
83}
Song Liu27e1f822019-09-23 15:38:30 -0700[diff] [blame]84static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
85 unsigned long addr)
86{
87}
Andrea Arcangeliba761492011-01-13 15:46:58 -0800[diff] [blame]88#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
89
90#endif /* _LINUX_KHUGEPAGED_H */