mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
957e3facd1
Following the suggestions from Andrew Morton and Stephen Rothwell, Dont expand the ARCH list in kernel/gcov/Kconfig. Instead, define a ARCH_HAS_GCOV_PROFILE_ALL bool which architectures can enable. set ARCH_HAS_GCOV_PROFILE_ALL on Architectures where it was previously allowed + ARM64 which I tested. Signed-off-by: Riku Voipio <riku.voipio@linaro.org> Cc: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
83 lines
2.1 KiB
Plaintext
83 lines
2.1 KiB
Plaintext
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 ARCH_HAS_GCOV_PROFILE_ALL
|
|
def_bool n
|
|
|
|
config GCOV_PROFILE_ALL
|
|
bool "Profile entire Kernel"
|
|
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.
|
|
|
|
choice
|
|
prompt "Specify GCOV format"
|
|
depends on GCOV_KERNEL
|
|
default GCOV_FORMAT_AUTODETECT
|
|
---help---
|
|
The gcov format is usually determined by the GCC version, but there are
|
|
exceptions where format changes are integrated in lower-version GCCs.
|
|
In such a case use this option to adjust the format used in the kernel
|
|
accordingly.
|
|
|
|
If unsure, choose "Autodetect".
|
|
|
|
config GCOV_FORMAT_AUTODETECT
|
|
bool "Autodetect"
|
|
---help---
|
|
Select this option to use the format that corresponds to your GCC
|
|
version.
|
|
|
|
config GCOV_FORMAT_3_4
|
|
bool "GCC 3.4 format"
|
|
---help---
|
|
Select this option to use the format defined by GCC 3.4.
|
|
|
|
config GCOV_FORMAT_4_7
|
|
bool "GCC 4.7 format"
|
|
---help---
|
|
Select this option to use the format defined by GCC 4.7.
|
|
|
|
endchoice
|
|
|
|
endmenu
|