CONFIG_GCOV_KERNEL: Enable gcov-based kernel profiling

General informations

The Linux kernel configuration item CONFIG_GCOV_KERNEL:

• prompt: Enable gcov-based kernel profiling
• type: bool
• depends on: ( CONFIG_DEBUG_FS ) && (! CONFIG_ARCH_WANTS_NO_INSTR || CONFIG_CC_HAS_NO_PROFILE_FN_ATTR )
• defined in kernel/gcov/Kconfig
• found in Linux kernels: 2.6.31–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12

Help text

This option enables gcov-based code profiling (e.g. for code coverage measurements).

If unsure, say N.

Additionally specify GCOV_PROFILE_ALL=y to get profiling data for the entire kernel. To enable profiling for specific files or directories, add a line similar to the following to the respective Makefile:

For a single file (e.g. main.o): GCOV_PROFILE_main.o := y

For all files in one directory: GCOV_PROFILE := y

To exclude files from being profiled even when GCOV_PROFILE_ALL is specified, use:

GCOV_PROFILE_main.o := n and: GCOV_PROFILE := n

Note that the debugfs filesystem has to be mounted to access profiling data.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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