Linux Kernel调度管理之cfs_rq

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cfs_rq是内核为普通进程设计的就绪队列：

/* CFS-related fields in a runqueue */
struct cfs_rq {
	struct load_weight load;
	unsigned int nr_running, h_nr_running;
	u64 exec_clock;
	u64 min_vruntime;
#ifndef CONFIG_64BIT
	u64 min_vruntime_copy;
#endif
	struct rb_root tasks_timeline;
	struct rb_node *rb_leftmost;
	/*
	 * 'curr' points to currently running entity on this cfs_rq.
	 * It is set to NULL otherwise (i.e when none are currently running).
	 */
	struct sched_entity *curr, *next, *last, *skip;
#ifdef	CONFIG_SCHED_DEBUG
	unsigned int nr_spread_over;
#endif
#ifdef CONFIG_SMP
	/*
	 * CFS load tracking
	 */
	struct sched_avg avg;
	u64 runnable_load_sum;
	unsigned long runnable_load_avg;
#ifdef CONFIG_FAIR_GROUP_SCHED
	unsigned long tg_load_avg_contrib;
#endif
	atomic_long_t removed_load_avg, removed_util_avg;
#ifndef CONFIG_64BIT
	u64 load_last_update_time_copy;
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
	/*
	 *   h_load = weight * f(tg)
	 *
	 * Where f(tg) is the recursive weight fraction assigned to
	 * this group.
	 */
	unsigned long h_load;
	u64 last_h_load_update;
	struct sched_entity *h_load_next;
#endif /* CONFIG_FAIR_GROUP_SCHED */
#endif /* CONFIG_SMP */
#ifdef CONFIG_FAIR_GROUP_SCHED
	struct rq *rq;	/* cpu runqueue to which this cfs_rq is attached */
	/*
	 * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
	 * a hierarchy). Non-leaf lrqs hold other higher schedulable entities
	 * (like users, containers etc.)
	 *
	 * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This
	 * list is used during load balance.
	 */
	int on_list;
	struct list_head leaf_cfs_rq_list;
	struct task_group *tg;	/* group that "owns" this runqueue */
#ifdef CONFIG_CFS_BANDWIDTH
	int runtime_enabled;
	u64 runtime_expires;
	s64 runtime_remaining;
	u64 throttled_clock, throttled_clock_task;
	u64 throttled_clock_task_time;
	int throttled, throttle_count;
	struct list_head throttled_list;
#endif /* CONFIG_CFS_BANDWIDTH */
#endif /* CONFIG_FAIR_GROUP_SCHED */
};

cfs_rq也是作为内嵌对象为rq队列的一个成员存在的。

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