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int do_execve(char * filename,	char __user *__user *argv,	char __user *__user *envp,	struct pt_regs * regs)	sched_exec();		=>void sched_exec(void)			if (migrate_task(p, dest_cpu, &req)) 				struct task_struct *mt = rq->migration_thread;//是个实时线程				wake_up_process(mt);					=>int wake_up_process(struct task_struct *p)						return try_to_wake_up(p, TASK_ALL, 0);							=>int try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)								cpu = select_task_rq(p, SD_BALANCE_WAKE, wake_flags);									=>int select_task_rq(struct task_struct *p, int sd_flags, int wake_flags)										int cpu = p->sched_class->select_task_rq(p, sd_flags, wake_flags);//.select_task_rq		= select_task_rq_rt,											int select_task_rq_rt(struct task_struct *p, int sd_flag, int flags)

linux内核线程migration_thread和kthreadd的创建

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