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notes's Issues

if (likely(!rt_overloaded(this_rq))) 注释 

/*如果当前队列的 root_domain 的 rto_count 不为 0，说明已经过载了，无需拉任务进来*/
if (likely(!rt_overloaded(this_rq)))
    return;

这里的意思应该是如果 this_rq 所在的 rd 下没有过载的 cpu，就没有 pull 的必要了，直接返回

内核抢占的矛盾点疑问

arch/x86/entry/entry_64.S这个文件中retint_kernel里jnc 1f这段是判断cf标志位，在它的上一句bt $9 EFLAGS(%rsp)中，应该获取的是eflags的第九位if标志到cf中，如果中断是开启的，此时cf应该是1，为什么在这里反而是判断cf是0呢？

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