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Commit | Line | Data |
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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 |
9b472e85 | 7 | depends on !CC_IS_CLANG || CLANG_VERSION >= 110000 |
51c2ee6d | 8 | depends on !ARCH_WANTS_NO_INSTR || CC_HAS_NO_PROFILE_FN_ATTR |
55b6f763 | 9 | select CONSTRUCTORS |
2521f2c2 | 10 | default n |
a7f7f624 | 11 | help |
2521f2c2 PO |
12 | This option enables gcov-based code profiling (e.g. for code coverage |
13 | measurements). | |
14 | ||
15 | If unsure, say N. | |
16 | ||
17 | Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data | |
18 | for the entire kernel. To enable profiling for specific files or | |
19 | directories, add a line similar to the following to the respective | |
20 | Makefile: | |
21 | ||
22 | For a single file (e.g. main.o): | |
23 | GCOV_PROFILE_main.o := y | |
24 | ||
25 | For all files in one directory: | |
26 | GCOV_PROFILE := y | |
27 | ||
28 | To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL | |
29 | is specified, use: | |
30 | ||
31 | GCOV_PROFILE_main.o := n | |
32 | and: | |
33 | GCOV_PROFILE := n | |
34 | ||
35 | Note that the debugfs filesystem has to be mounted to access | |
36 | profiling data. | |
37 | ||
957e3fac RV |
38 | config ARCH_HAS_GCOV_PROFILE_ALL |
39 | def_bool n | |
40 | ||
2521f2c2 PO |
41 | config GCOV_PROFILE_ALL |
42 | bool "Profile entire Kernel" | |
cc622420 | 43 | depends on !COMPILE_TEST |
2521f2c2 | 44 | depends on GCOV_KERNEL |
957e3fac | 45 | depends on ARCH_HAS_GCOV_PROFILE_ALL |
2521f2c2 | 46 | default n |
a7f7f624 | 47 | help |
2521f2c2 PO |
48 | This options activates profiling for the entire kernel. |
49 | ||
50 | If unsure, say N. | |
51 | ||
52 | Note that a kernel compiled with profiling flags will be significantly | |
53 | larger and run slower. Also be sure to exclude files from profiling | |
54 | which are not linked to the kernel image to prevent linker errors. | |
55 | ||
56 | endmenu |