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 GCOV_KERNEL 41 depends on ARCH_HAS_GCOV_PROFILE_ALL 42 default n 43 ---help--- 44 This options activates profiling for the entire kernel. 45 46 If unsure, say N. 47 48 Note that a kernel compiled with profiling flags will be significantly 49 larger and run slower. Also be sure to exclude files from profiling 50 which are not linked to the kernel image to prevent linker errors. 51 52choice 53 prompt "Specify GCOV format" 54 depends on GCOV_KERNEL 55 default GCOV_FORMAT_AUTODETECT 56 ---help--- 57 The gcov format is usually determined by the GCC version, but there are 58 exceptions where format changes are integrated in lower-version GCCs. 59 In such a case use this option to adjust the format used in the kernel 60 accordingly. 61 62 If unsure, choose "Autodetect". 63 64config GCOV_FORMAT_AUTODETECT 65 bool "Autodetect" 66 ---help--- 67 Select this option to use the format that corresponds to your GCC 68 version. 69 70config GCOV_FORMAT_3_4 71 bool "GCC 3.4 format" 72 ---help--- 73 Select this option to use the format defined by GCC 3.4. 74 75config GCOV_FORMAT_4_7 76 bool "GCC 4.7 format" 77 ---help--- 78 Select this option to use the format defined by GCC 4.7. 79 80endchoice 81 82endmenu 83