mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 16:44:10 +08:00
0766bffcae
The minimum supported version of LLVM has been raised to 11.0.0, meaning this check is always true, so it can be dropped. Signed-off-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> Reviewed-by: Mark Brown <broonie@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
56 lines
1.4 KiB
Plaintext
56 lines
1.4 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
|
|
menu "GCOV-based kernel profiling"
|
|
|
|
config GCOV_KERNEL
|
|
bool "Enable gcov-based kernel profiling"
|
|
depends on DEBUG_FS
|
|
depends on !ARCH_WANTS_NO_INSTR || CC_HAS_NO_PROFILE_FN_ATTR
|
|
select CONSTRUCTORS
|
|
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 ARCH_HAS_GCOV_PROFILE_ALL
|
|
def_bool n
|
|
|
|
config GCOV_PROFILE_ALL
|
|
bool "Profile entire Kernel"
|
|
depends on !COMPILE_TEST
|
|
depends on GCOV_KERNEL
|
|
depends on ARCH_HAS_GCOV_PROFILE_ALL
|
|
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.
|
|
|
|
endmenu
|