kernel/sched/autogroup.h

File Facts

System

Linux kernel

Corpus path

kernel/sched/autogroup.h

Extension

.h

Size

1662 bytes

Lines

69

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

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

• sched.h

Detected Declarations

• struct autogroup
• function task_group_is_autogroup
• function autogroup_task_group
• function autogroup_init
• function autogroup_task_group
• function autogroup_path

Annotated Snippet

struct autogroup {
	/*
	 * Reference doesn't mean how many threads attach to this
	 * autogroup now. It just stands for the number of tasks
	 * which could use this autogroup.
	 */
	struct kref		kref;
	struct task_group	*tg;
	struct rw_semaphore	lock;
	unsigned long		id;
	int			nice;
};

extern void autogroup_init(struct task_struct *init_task);
extern void autogroup_free(struct task_group *tg);

static inline bool task_group_is_autogroup(struct task_group *tg)
{
	return !!tg->autogroup;
}

extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);

static inline struct task_group *
autogroup_task_group(struct task_struct *p, struct task_group *tg)
{
	extern unsigned int sysctl_sched_autogroup_enabled;
	int enabled = READ_ONCE(sysctl_sched_autogroup_enabled);

	if (enabled && task_wants_autogroup(p, tg))
		return p->signal->autogroup->tg;

	return tg;
}

extern int autogroup_path(struct task_group *tg, char *buf, int buflen);

#else /* !CONFIG_SCHED_AUTOGROUP: */

static inline void autogroup_init(struct task_struct *init_task) {  }
static inline void autogroup_free(struct task_group *tg) { }
static inline bool task_group_is_autogroup(struct task_group *tg)
{
	return 0;
}

static inline struct task_group *
autogroup_task_group(struct task_struct *p, struct task_group *tg)
{
	return tg;
}

static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
{
	return 0;
}

#endif /* !CONFIG_SCHED_AUTOGROUP */

#endif /* _KERNEL_SCHED_AUTOGROUP_H */

Annotation

• Immediate include surface: `sched.h`.
• Detected declarations: `struct autogroup`, `function task_group_is_autogroup`, `function autogroup_task_group`, `function autogroup_init`, `function autogroup_task_group`, `function autogroup_path`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• 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.