LXR linux/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#include <linux/shmem_fs.h>
   7
   8
   9#ifdef CONFIG_TRANSPARENT_HUGEPAGE
  10extern struct attribute_group khugepaged_attr_group;
  11
  12extern int khugepaged_init(void);
  13extern void khugepaged_destroy(void);
  14extern int start_stop_khugepaged(void);
  15extern int __khugepaged_enter(struct mm_struct *mm);
  16extern void __khugepaged_exit(struct mm_struct *mm);
  17extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
  18                                      unsigned long vm_flags);
  19extern void khugepaged_min_free_kbytes_update(void);
  20#ifdef CONFIG_SHMEM
  21extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
  22#else
  23static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
  24                                           unsigned long addr)
  25{
  26}
  27#endif
  28
  29#define khugepaged_enabled()                                           \
  30        (transparent_hugepage_flags &                                  \
  31         ((1<<TRANSPARENT_HUGEPAGE_FLAG) |                     \
  32          (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
  33#define khugepaged_always()                             \
  34        (transparent_hugepage_flags &                   \
  35         (1<<TRANSPARENT_HUGEPAGE_FLAG))
  36#define khugepaged_req_madv()                                   \
  37        (transparent_hugepage_flags &                           \
  38         (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
  39#define khugepaged_defrag()                                     \
  40        (transparent_hugepage_flags &                           \
  41         (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
  42
  43static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
  44{
  45        if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
  46                return __khugepaged_enter(mm);
  47        return 0;
  48}
  49
  50static inline void khugepaged_exit(struct mm_struct *mm)
  51{
  52        if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
  53                __khugepaged_exit(mm);
  54}
  55
  56static inline int khugepaged_enter(struct vm_area_struct *vma,
  57                                   unsigned long vm_flags)
  58{
  59        if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
  60                if ((khugepaged_always() ||
  61                     (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) ||
  62                     (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
  63                    !(vm_flags & VM_NOHUGEPAGE) &&
  64                    !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
  65                        if (__khugepaged_enter(vma->vm_mm))
  66                                return -ENOMEM;
  67        return 0;
  68}
  69#else /* CONFIG_TRANSPARENT_HUGEPAGE */
  70static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
  71{
  72        return 0;
  73}
  74static inline void khugepaged_exit(struct mm_struct *mm)
  75{
  76}
  77static inline int khugepaged_enter(struct vm_area_struct *vma,
  78                                   unsigned long vm_flags)
  79{
  80        return 0;
  81}
  82static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
  83                                             unsigned long vm_flags)
  84{
  85        return 0;
  86}
  87static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
  88                                           unsigned long addr)
  89{
  90}
  91
  92static inline void khugepaged_min_free_kbytes_update(void)
  93{
  94}
  95#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  96
  97#endif /* _LINUX_KHUGEPAGED_H */
  98