155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KHUGEPAGED_H
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#define _LINUX_KHUGEPAGED_H
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#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
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#include <linux/shmem_fs.h>
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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extern struct attribute_group khugepaged_attr_group;
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extern int khugepaged_init(void);
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extern void khugepaged_destroy(void);
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extern int start_stop_khugepaged(void);
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extern int __khugepaged_enter(struct mm_struct *mm);
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extern void __khugepaged_exit(struct mm_struct *mm);
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extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
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unsigned long vm_flags);
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extern void khugepaged_min_free_kbytes_update(void);
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#ifdef CONFIG_SHMEM
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extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
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#else
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static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
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unsigned long addr)
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{
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}
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#endif
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#ifdef CONFIG_HUGETEXT
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extern void khugepaged_enter_exec_vma(struct vm_area_struct *vma,
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unsigned long vm_flags);
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extern unsigned long gather_refs_vma_range(struct vm_area_struct *vma,
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unsigned long start,
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unsigned long end);
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extern void clear_refs_vma_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern bool hugepage_mapping_check(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern void khugepaged_enter_adapt_vma(struct vm_area_struct *vma,
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unsigned long vm_flags);
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extern inline bool adapt_hugetext_suitable(struct vm_area_struct *vma);
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extern inline bool __khugepaged_max_nr_hugetext(void);
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#else
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static inline void khugepaged_enter_exec_vma(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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}
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static inline void khugepaged_enter_adapt_vma(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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}
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static inline bool adapt_hugetext_suitable(struct vm_area_struct *vma)
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{
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return false;
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}
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static inline bool __khugepaged_max_nr_hugetext(void)
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{
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return false;
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}
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#endif
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#ifdef CONFIG_HUGETEXT
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#define khugepaged_enabled() \
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(transparent_hugepage_flags & \
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((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
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(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) | \
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(1<<TRANSPARENT_HUGEPAGE_FILE_TEXT_ENABLED_FLAG) | \
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(1<<TRANSPARENT_HUGEPAGE_ANON_TEXT_ENABLED_FLAG)))
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#else
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#define khugepaged_enabled() \
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(transparent_hugepage_flags & \
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((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
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(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
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#endif
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#define khugepaged_always() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_FLAG))
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#define khugepaged_req_madv() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
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#define khugepaged_defrag() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
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static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
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{
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if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
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return __khugepaged_enter(mm);
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return 0;
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}
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static inline void khugepaged_exit(struct mm_struct *mm)
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{
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if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
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__khugepaged_exit(mm);
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}
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static inline int khugepaged_enter(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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if (unlikely(!memcg_transhuge_vma_enabled(vma)))
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return 0;
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if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
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if ((khugepaged_always() ||
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(shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) ||
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hugetext_vma_enabled(vma, vm_flags) ||
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(khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
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!(vm_flags & VM_NOHUGEPAGE) &&
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!test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
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if (__khugepaged_enter(vma->vm_mm))
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return -ENOMEM;
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if (hugetext_vma_enabled(vma, vm_flags) &&
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test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags)) {
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if (__khugepaged_max_nr_hugetext() && adapt_hugetext_suitable(vma) &&
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!shmem_file(vma->vm_file))
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khugepaged_enter_adapt_vma(vma, vm_flags);
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else
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khugepaged_enter_exec_vma(vma, vm_flags);
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}
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return 0;
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}
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
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{
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return 0;
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}
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static inline void khugepaged_exit(struct mm_struct *mm)
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{
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}
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static inline int khugepaged_enter(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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return 0;
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}
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static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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return 0;
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}
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static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
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unsigned long addr)
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{
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}
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static inline void khugepaged_min_free_kbytes_update(void)
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{
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif /* _LINUX_KHUGEPAGED_H */
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