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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
2521f2c2 PO |
2 | menu "GCOV-based kernel profiling" |
3 | ||
4 | config GCOV_KERNEL | |
5 | bool "Enable gcov-based kernel profiling" | |
d2c32258 | 6 | depends on DEBUG_FS |
87c9366e | 7 | select CONSTRUCTORS if !UML |
2521f2c2 PO |
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 | ||
957e3fac RV |
36 | config ARCH_HAS_GCOV_PROFILE_ALL |
37 | def_bool n | |
38 | ||
2521f2c2 PO |
39 | config GCOV_PROFILE_ALL |
40 | bool "Profile entire Kernel" | |
cc622420 | 41 | depends on !COMPILE_TEST |
2521f2c2 | 42 | depends on GCOV_KERNEL |
957e3fac | 43 | depends on ARCH_HAS_GCOV_PROFILE_ALL |
2521f2c2 PO |
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 | ||
17c568d6 FH |
54 | choice |
55 | prompt "Specify GCOV format" | |
56 | depends on GCOV_KERNEL | |
e178a5be | 57 | depends on CC_IS_GCC |
17c568d6 | 58 | ---help--- |
6a61b70b MY |
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 | |
17c568d6 | 61 | exceptions where format changes are integrated in lower-version GCCs. |
6a61b70b MY |
62 | In such a case, change this option to adjust the format used in the |
63 | kernel accordingly. | |
17c568d6 FH |
64 | |
65 | config GCOV_FORMAT_3_4 | |
66 | bool "GCC 3.4 format" | |
e178a5be | 67 | depends on GCC_VERSION < 40700 |
17c568d6 FH |
68 | ---help--- |
69 | Select this option to use the format defined by GCC 3.4. | |
70 | ||
71 | config 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 | ||
76 | endchoice | |
77 | ||
2521f2c2 | 78 | endmenu |