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 GCOV_PROFILE_ALL
  36         bool "Profile entire Kernel"
  37         depends on GCOV_KERNEL
  38         depends on SUPERH || S390 || X86 || PPC || MICROBLAZE
  39         default n
  40         ---help---
  41         This options activates profiling for the entire kernel.
  42
  43         If unsure, say N.
  44
  45         Note that a kernel compiled with profiling flags will be significantly
  46         larger and run slower. Also be sure to exclude files from profiling
  47         which are not linked to the kernel image to prevent linker errors.
  48
  49 choice
  50         prompt "Specify GCOV format"
  51         depends on GCOV_KERNEL
  52         default GCOV_FORMAT_AUTODETECT
  53         ---help---
  54         The gcov format is usually determined by the GCC version, but there are
  55         exceptions where format changes are integrated in lower-version GCCs.
  56         In such a case use this option to adjust the format used in the kernel
  57         accordingly.
  58
  59         If unsure, choose "Autodetect".
  60
  61 config GCOV_FORMAT_AUTODETECT
  62         bool "Autodetect"
  63         ---help---
  64         Select this option to use the format that corresponds to your GCC
  65         version.
  66
  67 config GCOV_FORMAT_3_4
  68         bool "GCC 3.4 format"
  69         ---help---
  70         Select this option to use the format defined by GCC 3.4.
  71
  72 config GCOV_FORMAT_4_7
  73         bool "GCC 4.7 format"
  74         ---help---
  75         Select this option to use the format defined by GCC 4.7.
  76
  77 endchoice
  78
  79 endmenu