struct rq

/kernel/sched.c

/*
 * This is the main, per-CPU runqueue data structure.
 *
 * Locking rule: those places that want to lock multiple runqueues
 * (such as the load balancing or the thread migration code), lock
 * acquire operations must be ordered by ascending &runqueue.
 */
struct rq {
    /* runqueue lock: */
    spinlock_t lock;

    /*
     * nr_running and cpu_load should be in the same cacheline because
     * remote CPUs use both these fields when doing load calculation.
     */
    unsigned long nr_running;
    #define CPU_LOAD_IDX_MAX 5
    unsigned long cpu_load[CPU_LOAD_IDX_MAX];
    
#ifdef CONFIG_NO_HZ
    unsigned long last_tick_seen;
    unsigned char in_nohz_recently;
#endif

    /* capture load from *all* tasks on this cpu: */
    struct load_weight load;
    unsigned long nr_load_updates;
    u64 nr_switches;
    u64 nr_migrations_in;

    struct cfs_rq cfs;
    struct rt_rq rt;

#ifdef CONFIG_FAIR_GROUP_SCHED
    /* list of leaf cfs_rq on this cpu: */
    struct list_head leaf_cfs_rq_list;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
    struct list_head leaf_rt_rq_list;
#endif

    /*
     * This is part of a global counter where only the total sum
     * over all CPUs matters. A task can increase this counter on
     * one CPU and if it got migrated afterwards it may decrease
     * it on another CPU. Always updated under the runqueue lock:
     */
    unsigned long nr_uninterruptible;

    struct task_struct *curr, *idle;
    unsigned long next_balance;
    struct mm_struct *prev_mm;

    u64 clock;

    atomic_t nr_iowait;

#ifdef CONFIG_SMP
    struct root_domain *rd;
    struct sched_domain *sd;

    unsigned char idle_at_tick;
    /* For active balancing */
    int post_schedule;
    int active_balance;
    int push_cpu;
    /* cpu of this runqueue: */
    int cpu;
    int online;

    unsigned long avg_load_per_task;

    struct task_struct *migration_thread;
    struct list_head migration_queue;

    u64 rt_avg;
    u64 age_stamp;
#endif

    /* calc_load related fields */
    unsigned long calc_load_update;
    long calc_load_active;

#ifdef CONFIG_SCHED_HRTICK
#ifdef CONFIG_SMP
    int hrtick_csd_pending;
    struct call_single_data hrtick_csd;
#endif
    struct hrtimer hrtick_timer;
#endif

#ifdef CONFIG_SCHEDSTATS
    /* latency stats */
    struct sched_info rq_sched_info;
    unsigned long long rq_cpu_time;
    /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */

    /* sys_sched_yield() stats */
    unsigned int yld_count;

    /* schedule() stats */
    unsigned int sched_switch;
    unsigned int sched_count;
    unsigned int sched_goidle;

    /* try_to_wake_up() stats */
    unsigned int ttwu_count;
    unsigned int ttwu_local;

    /* BKL stats */
    unsigned int bkl_count;
#endif
};