include/linux/khugepaged.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_KHUGEPAGED_H
   3 #define _LINUX_KHUGEPAGED_H
   4
   5 extern unsigned int khugepaged_max_ptes_none __read_mostly;
   6 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
   7 extern struct attribute_group khugepaged_attr_group;
   8
   9 extern int khugepaged_init(void);
  10 extern void khugepaged_destroy(void);
  11 extern int start_stop_khugepaged(void);
  12 extern void __khugepaged_enter(struct mm_struct *mm);
  13 extern void __khugepaged_exit(struct mm_struct *mm);
  14 extern void khugepaged_enter_vma(struct vm_area_struct *vma,
  15                                  unsigned long vm_flags);
  16 extern void khugepaged_min_free_kbytes_update(void);
  17 extern bool current_is_khugepaged(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
  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
  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
  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 */
  41 static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
  42 {
  43 }
  44 static inline void khugepaged_exit(struct mm_struct *mm)
  45 {
  46 }
  47 static inline void khugepaged_enter_vma(struct vm_area_struct *vma,
  48                                         unsigned long vm_flags)
  49 {
  50 }
  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
  57 static inline void khugepaged_min_free_kbytes_update(void)
  58 {
  59 }
  60
  61 static inline bool current_is_khugepaged(void)
  62 {
  63         return false;
  64 }
  65 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  66
  67 #endif /* _LINUX_KHUGEPAGED_H */