Linux内核中使用的三个优先级有什么区别？

优先事项分歧

1.静态优先级：这些是创建新线程时设置的默认优先级(传统进程的值0,即非实时进程,即不使用实时调度时).您可以使用以下方法更改它

`pthread_setschedparam(pthread_t thread,int policy,const struct sched_param *param);`

其中,sched_pa??ram包含优先级：

struct sched_param 
{
    int sched_priority;     /* Scheduling priority */
};

2动态优先级：当线程开始饿死因为一直在调度优先级较高的线程时,需要使用various mechanisms来提高这种线程的优先级.这种提升/降低(是的,这种情况也会发生)优先级被称为动态优先级,因为它不断变化.在Linux中,即使是胖孩子也可以玩.

3.实时优先级：只有当线程(进程)在一个实时策略(SCHED_FIFO,SCHED_RR)下调度并且sched_priority值在1(低)到99(高)范围内时才会出现这种情况.与非实时进程的静态/动态优先级相比,这是最高的.

更多信息：http://man7.org/linux/man-pages/man3/pthread_getschedparam.3.html

现在,问你的问题：

Correct me if i am wrong and please also tell me why we are using three types of priorities in Linux and what are the differences among
these priorities?

因此,对于非实时调度策略,每个进程都有一些静态优先级,更高的优先级使线程启动,后来为了避免任何不公正,优先级被提升/降低,这成为动态优先级.

Are the processes are differentiated as Real time or Conventional on the basis of priorities that is if priority is between 100 to 139
then processes are Conventional processes otherwise Real time
processes?

不是,它取决于适当的调度机制.

How the priorities are changed in Linux,i mean,we know that priority of a process does not remain constant through out the
execution ?

那是动态进入画面的时候.阅读给定链接中的“好价值”.