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Measuring Function Duration with Ftrace

Tim Bird, Sony Corporation

FTrace is relatively new kernel tool for tracing function execution in the Linux kernel. Recently, FTrace supports 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 presentation, the current state of the art for measuring function duration with FTrace will be described. This includes the author's own work to add a new capability to filter the trace data by function duration, and tools for analyzing kernel function call graphs and visualizing kernel boot time execution. This talk is targeted at Linux kernel developers.