Enable gcov-based kernel profiling
modulename: gcc_4_7.ko
and/orgcc_3_4.ko
and/orbase.ko
configname: CONFIG_GCOV_KERNEL
Linux Kernel Configuration
└─>GCOV-based kernel profiling
└─>Enable gcov-based kernel profiling
In linux kernel since version 2.6.31 (release Date: 2009-09-09)
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.
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.
source code:
selects
CONFIG_CONSTRUCTORSdepends
CONFIG_DEBUG_FS || CONFIG_CC_HAS_NO_PROFILE_FN_ATTR or NOT CONFIG_ARCH_WANTS_NO_INSTR or CONFIG_CLANG_VERSION=CONFIG_110000 or NOT CONFIG_CC_IS_CLANG