计算动态优先级 -- effective_prio()

effective_prio()函数返回进程p的动态优先级

---

static int effective_prio(task_t *p)
{
    int bonus, prio;

如果进程p是个实时进程，那么直接返回该实时进程的prio(实时进程的动态优先级prio不依赖于静态优先级static_prio，两者是否相等???)
|----------------------------|
|   if (rt_task(p))          |
|       return p->prio;      |
|----------------------------|

计算红利bonus:
|---------------------------------------------|
|   bonus = CURRENT_BONUS(p) - MAX_BONUS / 2; |
|---------------------------------------------|

根据如下公式计算该进程动态优先级prio:
prio = max ( 100, min(static_prio - bonus + 5, 139) )
|------------------------------------|
|   prio = p->static_prio - bonus;   |
|   if (prio < MAX_RT_PRIO)          |
|       prio = MAX_RT_PRIO;          |
|   if (prio > MAX_PRIO-1)           |
|       prio = MAX_PRIO-1;           |
|------------------------------------|
    return prio;
}








 

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