kernel/gcov/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 menu "GCOV-based kernel profiling"
   3
   4 config GCOV_KERNEL
   5         bool "Enable gcov-based kernel profiling"
   6         depends on DEBUG_FS
   7         select CONSTRUCTORS
   8         default n
   9         help
  10         This option enables gcov-based code profiling (e.g. for code coverage
  11         measurements).
  12
  13         If unsure, say N.
  14
  15         Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data
  16         for the entire kernel. To enable profiling for specific files or
  17         directories, add a line similar to the following to the respective
  18         Makefile:
  19
  20         For a single file (e.g. main.o):
  21                 GCOV_PROFILE_main.o := y
  22
  23         For all files in one directory:
  24                 GCOV_PROFILE := y
  25
  26         To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL
  27         is specified, use:
  28
  29                 GCOV_PROFILE_main.o := n
  30         and:
  31                 GCOV_PROFILE := n
  32
  33         Note that the debugfs filesystem has to be mounted to access
  34         profiling data.
  35
  36 config ARCH_HAS_GCOV_PROFILE_ALL
  37         def_bool n
  38
  39 config GCOV_PROFILE_ALL
  40         bool "Profile entire Kernel"
  41         depends on !COMPILE_TEST
  42         depends on GCOV_KERNEL
  43         depends on ARCH_HAS_GCOV_PROFILE_ALL
  44         default n
  45         help
  46         This options activates profiling for the entire kernel.
  47
  48         If unsure, say N.
  49
  50         Note that a kernel compiled with profiling flags will be significantly
  51         larger and run slower. Also be sure to exclude files from profiling
  52         which are not linked to the kernel image to prevent linker errors.
  53
  54 endmenu