1# SPDX-License-Identifier: GPL-2.0-only 2menu "GCOV-based kernel profiling" 3 4config GCOV_KERNEL 5 bool "Enable gcov-based kernel profiling" 6 depends on DEBUG_FS 7 select CONSTRUCTORS if !UML 8 default n 9 ---help--- 10 This option enables gcov-based code profiling (e.g. for code coverage 11 measurements). 12 13 If unsure, say N. 14 15 Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data 16 for the entire kernel. To enable profiling for specific files or 17 directories, add a line similar to the following to the respective 18 Makefile: 19 20 For a single file (e.g. main.o): 21 GCOV_PROFILE_main.o := y 22 23 For all files in one directory: 24 GCOV_PROFILE := y 25 26 To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL 27 is specified, use: 28 29 GCOV_PROFILE_main.o := n 30 and: 31 GCOV_PROFILE := n 32 33 Note that the debugfs filesystem has to be mounted to access 34 profiling data. 35 36config ARCH_HAS_GCOV_PROFILE_ALL 37 def_bool n 38 39config GCOV_PROFILE_ALL 40 bool "Profile entire Kernel" 41 depends on !COMPILE_TEST 42 depends on GCOV_KERNEL 43 depends on ARCH_HAS_GCOV_PROFILE_ALL 44 default n 45 ---help--- 46 This options activates profiling for the entire kernel. 47 48 If unsure, say N. 49 50 Note that a kernel compiled with profiling flags will be significantly 51 larger and run slower. Also be sure to exclude files from profiling 52 which are not linked to the kernel image to prevent linker errors. 53 54choice 55 prompt "Specify GCOV format" 56 depends on GCOV_KERNEL 57 depends on CC_IS_GCC 58 ---help--- 59 The gcov format is usually determined by the GCC version, and the 60 default is chosen according to your GCC version. However, there are 61 exceptions where format changes are integrated in lower-version GCCs. 62 In such a case, change this option to adjust the format used in the 63 kernel accordingly. 64 65config GCOV_FORMAT_3_4 66 bool "GCC 3.4 format" 67 depends on GCC_VERSION < 40700 68 ---help--- 69 Select this option to use the format defined by GCC 3.4. 70 71config GCOV_FORMAT_4_7 72 bool "GCC 4.7 format" 73 ---help--- 74 Select this option to use the format defined by GCC 4.7. 75 76endchoice 77 78endmenu 79