include/linux/khugepaged.h

   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 void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
  20 #else
  21 static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
  22                                            unsigned long addr)
  23 {
  24 }
  25 #endif
  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
  41 static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
  42 {
  43         if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
  44                 __khugepaged_enter(mm);
  45 }
  46
  47 static inline void khugepaged_exit(struct mm_struct *mm)
  48 {
  49         if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
  50                 __khugepaged_exit(mm);
  51 }
  52 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
  53 static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
  54 {
  55 }
  56 static inline void khugepaged_exit(struct mm_struct *mm)
  57 {
  58 }
  59 static inline void khugepaged_enter_vma(struct vm_area_struct *vma,
  60                                         unsigned long vm_flags)
  61 {
  62 }
  63 static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
  64                                            unsigned long addr)
  65 {
  66 }
  67
  68 static inline void khugepaged_min_free_kbytes_update(void)
  69 {
  70 }
  71 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  72
  73 #endif /* _LINUX_KHUGEPAGED_H */