Processes started by regular users usually have priority 0.
常规用户启动的进程优先级一般是0。
A log level of 1 only logs messages with a priority of 0 or 1.
级别为1的日志仅记录优先级为0或1的消息。
All fixed priority threads will be placed on the run queue if you change the default from 0 to 1.
如果您将缺省值从0更改为1，那么所有固定优先级的线程都将放入到这个运行队列中。
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