bottom - half处理过程在内核上下文完成，这意味着允许中断操作。
The bottom-half processing is performed in the kernel context, which means that interrupts are enabled.
如下所示，在报表中不打印列edlevel不会影响定义在该列上的计算和中断操作。
As shown, not printing column EDLEVEL in the report doesn't affect the compute and break operations defined on it.
对于调试来说，它是很有价值的，它允许调试器中断操作系统代码、并检查硬件寄存器。
It is useful for debugging purposes by letting the debugger break into operating system code and examining the hardware registers.
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