kernel/gcov/Kconfig

   1 menu "GCOV-based kernel profiling"
   2
   3 config 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
  35 config ARCH_HAS_GCOV_PROFILE_ALL
  36         def_bool n
  37
  38 config 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
  53 choice
  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
  65 config GCOV_FORMAT_AUTODETECT
  66         bool "Autodetect"
  67         ---help---
  68         Select this option to use the format that corresponds to your GCC
  69         version.
  70
  71 config 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
  76 config 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
  81 endchoice
  82
  83 endmenu