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