CONFIG_FTRACE: Tracers

General informations

The Linux kernel configuration item CONFIG_FTRACE has multiple definitions:

Tracers found in kernel/trace/Kconfig

The configuration item CONFIG_FTRACE:

• prompt: Tracers
• type: bool
• depends on: ( CONFIG_TRACING_SUPPORT ) && ( CONFIG_DEBUG_KERNEL )
• defined in kernel/trace/Kconfig
• found in Linux kernels: 2.6.31–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Enable the kernel tracing infrastructure.

Kernel Function Tracer found in kernel/trace/Kconfig

The configuration item CONFIG_FTRACE:

• prompt: Kernel Function Tracer
• type: bool
• depends on: CONFIG_HAVE_FTRACE
• defined in kernel/trace/Kconfig
• found in Linux kernels: 2.6.27

Help text

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 to 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.

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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