【Linux 内核】调度器 ② ( sched_class 调度类结构体源码 | 源码路径 linux-5.6.18\kernel\sched\sched.h )

struct sched_class {
	const struct sched_class *next;

#ifdef CONFIG_UCLAMP_TASK
	int uclamp_enabled;
#endif

	void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
	void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
	void (*yield_task)   (struct rq *rq);
	bool (*yield_to_task)(struct rq *rq, struct task_struct *p, bool preempt);

	void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags);

	struct task_struct *(*pick_next_task)(struct rq *rq);

	void (*put_prev_task)(struct rq *rq, struct task_struct *p);
	void (*set_next_task)(struct rq *rq, struct task_struct *p, bool first);

#ifdef CONFIG_SMP
	int (*balance)(struct rq *rq, struct task_struct *prev, struct rq_flags *rf);
	int  (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags);
	void (*migrate_task_rq)(struct task_struct *p, int new_cpu);

	void (*task_woken)(struct rq *this_rq, struct task_struct *task);

	void (*set_cpus_allowed)(struct task_struct *p,
				 const struct cpumask *newmask);

	void (*rq_online)(struct rq *rq);
	void (*rq_offline)(struct rq *rq);
#endif

	void (*task_tick)(struct rq *rq, struct task_struct *p, int queued);
	void (*task_fork)(struct task_struct *p);
	void (*task_dead)(struct task_struct *p);

	/*
	 * The switched_from() call is allowed to drop rq->lock, therefore we
	 * cannot assume the switched_from/switched_to pair is serliazed by
	 * rq->lock. They are however serialized by p->pi_lock.
	 */
	void (*switched_from)(struct rq *this_rq, struct task_struct *task);
	void (*switched_to)  (struct rq *this_rq, struct task_struct *task);
	void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
			      int oldprio);

	unsigned int (*get_rr_interval)(struct rq *rq,
					struct task_struct *task);

	void (*update_curr)(struct rq *rq);

#define TASK_SET_GROUP		0
#define TASK_MOVE_GROUP		1

#ifdef CONFIG_FAIR_GROUP_SCHED
	void (*task_change_group)(struct task_struct *p, int type);
#endif
};