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

 1# SPDX-License-Identifier: GPL-2.0-only
 2menu "GCOV-based kernel profiling"
 3
 4config GCOV_KERNEL
 5	bool "Enable gcov-based kernel profiling"
 6	depends on DEBUG_FS
 7	depends on !CC_IS_CLANG || CLANG_VERSION >= 110000
 8	depends on !ARCH_WANTS_NO_INSTR || CC_HAS_NO_PROFILE_FN_ATTR
 9	select CONSTRUCTORS
10	default n
11	help
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
38config ARCH_HAS_GCOV_PROFILE_ALL
39	def_bool n
40
41config GCOV_PROFILE_ALL
42	bool "Profile entire Kernel"
43	depends on !COMPILE_TEST
44	depends on GCOV_KERNEL
45	depends on ARCH_HAS_GCOV_PROFILE_ALL
46	default n
47	help
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
56endmenu