一张图懂得O(1)算法

一张图理解O(1)算法

                                                                Linux O(1) scheduler algorithm

struct prio_array array = rq->active;if (!array->nr_active) {rq->active = rq->expired;rq->expired = array;}

struct task_struct *prev, *next;struct list_head *queue;struct prio_array array;int idx;prev = current;array = rq->active;idx = sched_find_first_bit(array->bitmap);queue = array->queue + idx;next = list_entry(queue->next, struct task_struct, run_list);