Linux ｜ 负载均衡理解之调度了解

/*
 * sd_lb_stats - Structure to store the statistics of a sched_domain
 *     during load balancing.
 */
struct sd_lb_stats {
  struct sched_group *busiest;  /* Busiest group in this sd */
  struct sched_group *local;  /* Local group in this sd */
  unsigned long total_load;  /* Total load of all groups in sd */
  unsigned long total_capacity;  /* Total capacity of all groups in sd */
  unsigned long avg_load;  /* Average load across all groups in sd */
  unsigned int prefer_sibling; /* tasks should go to sibling first */

  struct sg_lb_stats busiest_stat;/* Statistics of the busiest group */
  struct sg_lb_stats local_stat;  /* Statistics of the local group */
};

/*
 * sg_lb_stats - stats of a sched_group required for load_balancing
 */
struct sg_lb_stats {
  unsigned long avg_load; /*Avg load across the CPUs of the group */
  unsigned long group_load; /* Total load over the CPUs of the group */
  unsigned long group_capacity;
  unsigned long group_util; /* Total utilization over the CPUs of the group */
  unsigned long group_runnable; /* Total runnable time over the CPUs of the group */
  unsigned int sum_nr_running; /* Nr of tasks running in the group */
  unsigned int sum_h_nr_running; /* Nr of CFS tasks running in the group */
  unsigned int idle_cpus;
  unsigned int group_weight;
  enum group_type group_type;
  unsigned int group_asym_packing; /* Tasks should be moved to preferred CPU */
  unsigned long group_misfit_task_load; /* A CPU has a task too big for its capacity */
#ifdef CONFIG_NUMA_BALANCING
  unsigned int nr_numa_running;
  unsigned int nr_preferred_running;
#endif
};