Release 4.12 include/linux/khugepaged.h

#ifndef _LINUX_KHUGEPAGED_H

#define _LINUX_KHUGEPAGED_H

#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */


#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern struct attribute_group khugepaged_attr_group;

extern int khugepaged_init(void);
extern void khugepaged_destroy(void);
extern int start_stop_khugepaged(void);
extern int __khugepaged_enter(struct mm_struct *mm);
extern void __khugepaged_exit(struct mm_struct *mm);
extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
				      unsigned long vm_flags);


#define khugepaged_enabled()					       \
	(transparent_hugepage_flags &                                  \
         ((1<<TRANSPARENT_HUGEPAGE_FLAG) |                     \
          (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))

#define khugepaged_always()				\
	(transparent_hugepage_flags &                   \
         (1<<TRANSPARENT_HUGEPAGE_FLAG))

#define khugepaged_req_madv()					\
	(transparent_hugepage_flags &                           \
         (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))

#define khugepaged_defrag()					\
	(transparent_hugepage_flags &                           \
         (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))



static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
	if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
		return __khugepaged_enter(mm);
	return 0;
}

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static inline void khugepaged_exit(struct mm_struct *mm)
{
	if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
		__khugepaged_exit(mm);
}

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static inline int khugepaged_enter(struct vm_area_struct *vma,
				   unsigned long vm_flags)
{
	if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
		if ((khugepaged_always() ||
		     (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
		    !(vm_flags & VM_NOHUGEPAGE))
			if (__khugepaged_enter(vma->vm_mm))
				return -ENOMEM;
	return 0;
}
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */


static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
	return 0;
}
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static inline void khugepaged_exit(struct mm_struct *mm)
{
}
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static inline int khugepaged_enter(struct vm_area_struct *vma,
				   unsigned long vm_flags)
{
	return 0;
}
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static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
					     unsigned long vm_flags)
{
	return 0;
}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif /* _LINUX_KHUGEPAGED_H */
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Directory: include/linux

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