schedule.c中的代码谁能帮我解释一下

peterwlp

repeat_schedule:
        /*
         * Default process to select..
         */
        next = idle_task(this_cpu);
        c = -1000;
        list_for_each(tmp, &runqueue_head) {
                p = list_entry(tmp, struct task_struct, run_list);
                if (can_schedule(p, this_cpu)) {
                        int weight = goodness(p, this_cpu, prev->active_mm);
                        if (weight > c)
                                c = weight, next = p;