include/linux/vmpressure.h

File Facts

System

Linux kernel

Corpus path

include/linux/vmpressure.h

Extension

.h

Size

1741 bytes

Lines

54

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/mutex.h
• linux/list.h
• linux/workqueue.h
• linux/gfp.h
• linux/types.h
• linux/cgroup.h
• linux/eventfd.h

Detected Declarations

• struct vmpressure
• struct mem_cgroup
• function vmpressure

Annotated Snippet

struct vmpressure {
	unsigned long scanned;
	unsigned long reclaimed;

	unsigned long tree_scanned;
	unsigned long tree_reclaimed;
	/* The lock is used to keep the scanned/reclaimed above in sync. */
	spinlock_t sr_lock;

	/* The list of vmpressure_event structs. */
	struct list_head events;
	/* Have to grab the lock on events traversal or modifications. */
	struct mutex events_lock;

	struct work_struct work;
};

struct mem_cgroup;

#ifdef CONFIG_MEMCG
void vmpressure(gfp_t gfp, int order, struct mem_cgroup *memcg, bool tree,
		unsigned long scanned, unsigned long reclaimed);
extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);

extern void vmpressure_init(struct vmpressure *vmpr);
extern void vmpressure_cleanup(struct vmpressure *vmpr);
extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
extern struct mem_cgroup *vmpressure_to_memcg(struct vmpressure *vmpr);
extern int vmpressure_register_event(struct mem_cgroup *memcg,
				     struct eventfd_ctx *eventfd,
				     const char *args);
extern void vmpressure_unregister_event(struct mem_cgroup *memcg,
					struct eventfd_ctx *eventfd);
#else
static inline void vmpressure(gfp_t gfp, int order, struct mem_cgroup *memcg,
			      bool tree, unsigned long scanned,
			      unsigned long reclaimed) {}
static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg,
				   int prio) {}
#endif /* CONFIG_MEMCG */
#endif /* __LINUX_VMPRESSURE_H */

Annotation

• Immediate include surface: `linux/mutex.h`, `linux/list.h`, `linux/workqueue.h`, `linux/gfp.h`, `linux/types.h`, `linux/cgroup.h`, `linux/eventfd.h`.
• Detected declarations: `struct vmpressure`, `struct mem_cgroup`, `function vmpressure`.
• 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.