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Measuring Function Duration with FTrace

Tim Bird (tim.bird@am.sony.com)

FTrace is relatively new kernel tool for tracing function execution in the Linux kernel. Recently, FTrace added the ability to trace function exit in addition to function entry. This allows for measurement of function duration, which adds an incredibly powerful tool for finding time-consuming areas of kernel execution. In this paper, the current state of the art for measuring function duration with FTrace is described. This includes recent work to add a new capability to filter the trace data by function duration, and tools for analyzing kernel function call graphs and kernel boot time execution.



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