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