This method decreases probe's overhead in kernel control path as far as possible, so it is applicable to various context.
方法尽可能地减小探测器在内核控制路径上的开销，适用于各种不同的环境。
A critical region is any section of code that must be completely executed by any kernel control path that enters it before another kernel control path can enter it.
当内核正在执行处于临界区内的代码的时候，在该内核控制路径没有执行完临界区的代码之前，任何其它内核控制路径不能进入该临界区。
A critical region is any section of code that must be completely executed by any kernel control path that enters it before another kernel control path can enter it.
当内核正在执行处于临界区内的代码的时候，在该内核控制路径没有执行完临界区的代码之前，任何其它内核控制路径不能进入该临界区。
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