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API traces have been used to analyze user behaviour and system software behaviour for years, which lead to advances in file system and storage technologies. We describe the implementation of a lightweight and dynamic API collecting tool which calls Trace_probe in this paper. Trace_probe can trace information of the kernels. It based on kprobe mechanism which is implemented in the 2.6 linux kernel and later versions. This tool is designed to be a mount/unmount module, and its characteristics are simple and lightweight. While it works, it will not affect the normal operations of the users. Further experiments show Trace_probe has some advantags in terms of application limitationen and performance degradation.