[mirror_ubuntu-jammy-kernel.git] / include / linux / khugepaged.h

/* SPDX-License-Identifier: GPL-2.0 */
#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);
#ifdef CONFIG_SHMEM
extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
#else
static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
					   unsigned long addr)
{
}
#endif

#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;
}

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

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) &&
		    !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
			if (__khugepaged_enter(vma->vm_mm))
				return -ENOMEM;
	return 0;
}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
	return 0;
}
static inline void khugepaged_exit(struct mm_struct *mm)
{
}
static inline int khugepaged_enter(struct vm_area_struct *vma,
				   unsigned long vm_flags)
{
	return 0;
}
static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
					     unsigned long vm_flags)
{
	return 0;
}
static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
					   unsigned long addr)
{
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif /* _LINUX_KHUGEPAGED_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
ba76149f AA	2	#ifndef _LINUX_KHUGEPAGED_H
	3	#define _LINUX_KHUGEPAGED_H
	4
f7ccbae4 IM	5	#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
f7ccbae4 IM	6
ba76149f AA	7
ba76149f AA	8	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
b46e756f KS	9	extern struct attribute_group khugepaged_attr_group;
	10
	11	extern int khugepaged_init(void);
	12	extern void khugepaged_destroy(void);
	13	extern int start_stop_khugepaged(void);
ba76149f AA	14	extern int __khugepaged_enter(struct mm_struct *mm);
ba76149f AA	15	extern void __khugepaged_exit(struct mm_struct *mm);
6d50e60c DR	16	extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
6d50e60c DR	17	unsigned long vm_flags);
27e1f827 SL	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
ba76149f AA	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 int khugepaged_fork(struct mm_struct mm, struct mm_struct oldmm)
	42	{
	43	if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
	44	return __khugepaged_enter(mm);
	45	return 0;
	46	}
	47
	48	static inline void khugepaged_exit(struct mm_struct *mm)
	49	{
	50	if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
	51	__khugepaged_exit(mm);
	52	}
	53
6d50e60c DR	54	static inline int khugepaged_enter(struct vm_area_struct *vma,
6d50e60c DR	55	unsigned long vm_flags)
ba76149f AA	56	{
ba76149f AA	57	if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
a664b2d8	58	if ((khugepaged_always() \|\|
6d50e60c	59	(khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
18600332 MH	60	!(vm_flags & VM_NOHUGEPAGE) &&
18600332 MH	61	!test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
ba76149f AA	62	if (__khugepaged_enter(vma->vm_mm))
	63	return -ENOMEM;
	64	return 0;
	65	}
	66	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
	67	static inline int khugepaged_fork(struct mm_struct mm, struct mm_struct oldmm)
	68	{
	69	return 0;
	70	}
	71	static inline void khugepaged_exit(struct mm_struct *mm)
	72	{
	73	}
6d50e60c DR	74	static inline int khugepaged_enter(struct vm_area_struct *vma,
6d50e60c DR	75	unsigned long vm_flags)
ba76149f AA	76	{
	77	return 0;
	78	}
6d50e60c DR	79	static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
6d50e60c DR	80	unsigned long vm_flags)
ba76149f AA	81	{
	82	return 0;
	83	}
27e1f827 SL	84	static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
	85	unsigned long addr)
	86	{
	87	}
ba76149f AA	88	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	89
	90	#endif /* _LINUX_KHUGEPAGED_H */