tasks in 2.6

["manish regmi" <manish_regmi@hotmail.com>]

Hi,
Linux 2.6 uses two priority arrays in runqueue. One for active and other for 
expired task.

struct runqueue {
	spinlock_t lock;
	unsigned long nr_running, nr_switches, expired_timestamp,
		      nr_uninterruptible, timestamp_last_tick;
	task_t *curr, *idle;
	struct mm_struct *prev_mm;
	prio_array_t *active, *expired, arrays[2];
	int best_expired_prio, prev_cpu_load[NR_CPUS];
#ifdef CONFIG_NUMA
	atomic_t *node_nr_running;
	int prev_node_load[MAX_NUMNODES];
#endif
	task_t *migration_thread;
	struct list_head migration_queue;

	atomic_t nr_iowait;
};

So, What are active and expired task.

thanks.

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