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2521f2c2 PO |
1 | menu "GCOV-based kernel profiling" |
2 | ||
3 | config GCOV_KERNEL | |
4 | bool "Enable gcov-based kernel profiling" | |
d2c32258 | 5 | depends on DEBUG_FS |
947be5df | 6 | select CONSTRUCTORS if !UML |
2521f2c2 PO |
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 | ||
957e3fac RV |
35 | config ARCH_HAS_GCOV_PROFILE_ALL |
36 | def_bool n | |
37 | ||
2521f2c2 PO |
38 | config GCOV_PROFILE_ALL |
39 | bool "Profile entire Kernel" | |
40 | depends on GCOV_KERNEL | |
957e3fac | 41 | depends on ARCH_HAS_GCOV_PROFILE_ALL |
2521f2c2 PO |
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 | ||
17c568d6 FH |
52 | choice |
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 | ||
64 | config GCOV_FORMAT_AUTODETECT | |
65 | bool "Autodetect" | |
66 | ---help--- | |
67 | Select this option to use the format that corresponds to your GCC | |
68 | version. | |
69 | ||
70 | config 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 | ||
75 | config 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 | ||
80 | endchoice | |
81 | ||
2521f2c2 | 82 | endmenu |