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CONFIG_FUNCTION_TRACER: Kernel Function Tracer

General informations

The Linux kernel configuration item CONFIG_FUNCTION_TRACER:

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Enable the kernel to trace every kernel function. This is done by using a compiler feature to insert a small, 5-byte No-Operation instruction at the beginning of every kernel function, which NOP sequence is then dynamically patched into a tracer call when tracing is enabled by the administrator. If it's runtime disabled (the bootup default), then the overhead of the instructions is very small and not measurable even in micro-benchmarks (at least on x86, but may have impact on other architectures).



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