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menu "GCOV-based kernel profiling"
config GCOV_KERNEL
bool "Enable gcov-based kernel profiling"
depends on DEBUG_FS
select CONSTRUCTORS if !UML
default n
---help---
This option enables gcov-based code profiling (e.g. for code coverage
measurements).
If unsure, say N.
Additionally specify CONFIG_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 CONFIG_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.
config GCOV_PROFILE_ALL
bool "Profile entire Kernel"
depends on GCOV_KERNEL
depends on SUPERH || S390 || X86 || PPC || MICROBLAZE || ARM
default n
---help---
This options activates profiling for the entire kernel.
If unsure, say N.
Note that a kernel compiled with profiling flags will be significantly
larger and run slower. Also be sure to exclude files from profiling
which are not linked to the kernel image to prevent linker errors.
config GCOV_TOOLCHAIN_IS_ANDROID
bool "Use Android toolchain ABI for gcov instead of vanilla gcc ABI"
default n
---help---
This option must be set if a gcov-enabled kernel is being built with an
Android toolchain. The gcov ABI in Android gcc is not compatible with
vanilla gcc, and choosing this option incorrectly might lead to kernel
panics during boot or when dumping the gcov data.
If unsure, say N.
config GCOV_CTORS
string
depends on CONSTRUCTORS
default ".init_array" if ARM && AEABI
default ".ctors"
endmenu
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