根据跟踪量、缓冲区大小和输出设备的带宽，可以将多个缓冲区分配给给定的线程，从而与生成跟踪数据的速度相匹配。
Depending on trace volume, buffer size, and the bandwidth of the output device, multiple buffers might be allocated to a given thread to keep pace with trace data that is being generated.
如果发生了缓冲区回绕，就向用户输出警告。
A warning is printed to the user if a buffer wrap condition has occurred.
输出缓冲区的格式由第五参数(格式名称)定义。
The format of the output buffer is defined by the 5th parameter (format name).
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