在此，param是指向描述调度优先级结构体的指针。
Here, param is a pointer to a structure representing scheduling priority.
清单1中的ni列展示了调度优先级或者说每个进程的niceness。
The ni column in Listing 1 above, shows the scheduling priority or niceness of each process.
为了确保重要的进程能够得到 CPU，这种选择是基于调度优先级 进程的。
To ensure that important processes don't get starved out by CPU hogs, the selection is done based on a scheduling priority.
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