Finally, the idle task is started and the scheduler can now take control (after the call to cpu_idle).
最后，启动空任务，现在调度器就可以接管控制权了（在调用 cpu_idle 之后）。
On modern processors, where a HLT (halt) instruction saves significant amounts of power and heat, the idle task almost always consists of a loop which repeatedly executes HLTinstructions.
在现代的处理器中，HLT停机指令节省了大量的电能与执量，空闲任务几乎总是由一个重复执行HLT停机指令的循环组成。
Likewise, finalizers are normally processed as a background task, so their cost is usually amortized across the system's idle time.
同样，终结通常是后台任务，所以它们常常在系统的空闲时间执行。
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