默认值为正常优先级。
的6优先级只是一个高于正常优先级，使这个调度略微偏向朝它。
The 6 priority is just one above normal priority to make this scheduler bias slightly towards it.
来自高优先级矢量的微线程先得到服务，随后是来自正常优先级矢量的微线程。
Tasklets from the high-priority vector are serviced first, followed by those on the normal vector.
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