include/linux/khugepaged.h

File Facts

System

Linux kernel

Corpus path

include/linux/khugepaged.h

Extension

.h

Size

1646 bytes

Lines

61

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/mm.h

Detected Declarations

• function khugepaged_fork
• function khugepaged_exit
• function khugepaged_fork

Annotated Snippet

#ifndef _LINUX_KHUGEPAGED_H
#define _LINUX_KHUGEPAGED_H

#include <linux/mm.h>

extern unsigned int khugepaged_max_ptes_none __read_mostly;
#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 void __khugepaged_enter(struct mm_struct *mm);
extern void __khugepaged_exit(struct mm_struct *mm);
extern void khugepaged_enter_vma(struct vm_area_struct *vma,
				 vm_flags_t vm_flags);
extern void khugepaged_min_free_kbytes_update(void);
extern bool current_is_khugepaged(void);
void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr,
		bool install_pmd);

static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
	if (mm_flags_test(MMF_VM_HUGEPAGE, oldmm))
		__khugepaged_enter(mm);
}

static inline void khugepaged_exit(struct mm_struct *mm)
{
	if (mm_flags_test(MMF_VM_HUGEPAGE, mm))
		__khugepaged_exit(mm);
}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
}
static inline void khugepaged_exit(struct mm_struct *mm)
{
}
static inline void khugepaged_enter_vma(struct vm_area_struct *vma,
					vm_flags_t vm_flags)
{
}
static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
		unsigned long addr, bool install_pmd)
{
}

static inline void khugepaged_min_free_kbytes_update(void)
{
}

static inline bool current_is_khugepaged(void)
{
	return false;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif /* _LINUX_KHUGEPAGED_H */

Annotation

• Immediate include surface: `linux/mm.h`.
• Detected declarations: `function khugepaged_fork`, `function khugepaged_exit`, `function khugepaged_fork`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.