kernel/rcu/tree.h

295 struct rcu_state {  struct
296 	struct rcu_node node[NUM_RCU_NODES];	/* Hierarchy. */
297 	struct rcu_node *level[RCU_NUM_LVLS + 1];
300 	int ncpus;				/* # CPUs seen so far. */
304 	u8	boost ____cacheline_internodealigned_in_smp;
306 	unsigned long gp_seq;			/* Grace-period sequence #. */
307 	unsigned long gp_max;			/* Maximum GP duration in */
309 	struct task_struct *gp_kthread;		/* Task for grace periods. */
310 	struct swait_queue_head gp_wq;		/* Where GP task waits. */
311 	short gp_flags;				/* Commands for GP task. */
312 	short gp_state;				/* GP kthread sleep state. */
313 	unsigned long gp_wake_time;		/* Last GP kthread wake. */
314 	unsigned long gp_wake_seq;		/* ->gp_seq at ^^^. */
318 	struct mutex barrier_mutex;		/* Guards barrier fields. */
319 	atomic_t barrier_cpu_count;		/* # CPUs waiting on. */
320 	struct completion barrier_completion;	/* Wake at barrier end. */
321 	unsigned long barrier_sequence;		/* ++ at start and end of */
325 	struct mutex exp_mutex;			/* Serialize expedited GP. */
326 	struct mutex exp_wake_mutex;		/* Serialize wakeup. */
327 	unsigned long expedited_sequence;	/* Take a ticket. */
328 	atomic_t expedited_need_qs;		/* # CPUs left to check in. */
329 	struct swait_queue_head expedited_wq;	/* Wait for check-ins. */
330 	int ncpus_snap;				/* # CPUs seen last time. */
331 	u8 cbovld;				/* Callback overload now? */
332 	u8 cbovldnext;				/* ^        ^  next time? */
334 	unsigned long jiffies_force_qs;		/* Time at which to invoke */
336 	unsigned long jiffies_kick_kthreads;	/* Time at which to kick */
338 	unsigned long n_force_qs;		/* Number of calls to */
362 /* Values for rcu_state structure's gp_flags field. */  argument