Linux Kernel调度管理之sched_entity

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sched_entity是调度实体描述，描述可被调度的对象：

struct sched_entity {
	struct load_weight	load;		/* for load-balancing */
	struct rb_node		run_node;
	struct list_head	group_node;
	unsigned int		on_rq;
	u64			exec_start;
	u64			sum_exec_runtime;
	u64			vruntime;
	u64			prev_sum_exec_runtime;
	u64			nr_migrations;
#ifdef CONFIG_SCHEDSTATS
	struct sched_statistics statistics;
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
	int			depth;
	struct sched_entity	*parent;
	/* rq on which this entity is (to be) queued: */
	struct cfs_rq		*cfs_rq;
	/* rq "owned" by this entity/group: */
	struct cfs_rq		*my_q;
#endif
#ifdef CONFIG_SMP
	/*
	 * Per entity load average tracking.
	 *
	 * Put into separate cache line so it does not
	 * collide with read-mostly values above.
	 */
	struct sched_avg	avg ____cacheline_aligned_in_smp;
#endif
};

需要注意，进程描述符中含有三个类别的调度实体，即cfs，rt，dl三个。

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