kernel/rcu/Kconfig.debug

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # RCU-related debugging configuration options
   4 #
   5
   6 menu "RCU Debugging"
   7
   8 config PROVE_RCU
   9         def_bool PROVE_LOCKING
  10
  11 config PROVE_RCU_LIST
  12         bool "RCU list lockdep debugging"
  13         depends on PROVE_RCU && RCU_EXPERT
  14         default n
  15         help
  16           Enable RCU lockdep checking for list usages. By default it is
  17           turned off since there are several list RCU users that still
  18           need to be converted to pass a lockdep expression. To prevent
  19           false-positive splats, we keep it default disabled but once all
  20           users are converted, we can remove this config option.
  21
  22 config TORTURE_TEST
  23         tristate
  24         default n
  25
  26 config RCU_PERF_TEST
  27         tristate "performance tests for RCU"
  28         depends on DEBUG_KERNEL
  29         select TORTURE_TEST
  30         select SRCU
  31         select TASKS_RCU
  32         select TASKS_RUDE_RCU
  33         select TASKS_TRACE_RCU
  34         default n
  35         help
  36           This option provides a kernel module that runs performance
  37           tests on the RCU infrastructure.  The kernel module may be built
  38           after the fact on the running kernel to be tested, if desired.
  39
  40           Say Y here if you want RCU performance tests to be built into
  41           the kernel.
  42           Say M if you want the RCU performance tests to build as a module.
  43           Say N if you are unsure.
  44
  45 config RCU_TORTURE_TEST
  46         tristate "torture tests for RCU"
  47         depends on DEBUG_KERNEL
  48         select TORTURE_TEST
  49         select SRCU
  50         select TASKS_RCU
  51         select TASKS_RUDE_RCU
  52         select TASKS_TRACE_RCU
  53         default n
  54         help
  55           This option provides a kernel module that runs torture tests
  56           on the RCU infrastructure.  The kernel module may be built
  57           after the fact on the running kernel to be tested, if desired.
  58
  59           Say Y here if you want RCU torture tests to be built into
  60           the kernel.
  61           Say M if you want the RCU torture tests to build as a module.
  62           Say N if you are unsure.
  63
  64 config RCU_CPU_STALL_TIMEOUT
  65         int "RCU CPU stall timeout in seconds"
  66         depends on RCU_STALL_COMMON
  67         range 3 300
  68         default 21
  69         help
  70           If a given RCU grace period extends more than the specified
  71           number of seconds, a CPU stall warning is printed.  If the
  72           RCU grace period persists, additional CPU stall warnings are
  73           printed at more widely spaced intervals.
  74
  75 config RCU_TRACE
  76         bool "Enable tracing for RCU"
  77         depends on DEBUG_KERNEL
  78         default y if TREE_RCU
  79         select TRACE_CLOCK
  80         help
  81           This option enables additional tracepoints for ftrace-style
  82           event tracing.
  83
  84           Say Y here if you want to enable RCU tracing
  85           Say N if you are unsure.
  86
  87 config RCU_EQS_DEBUG
  88         bool "Provide debugging asserts for adding NO_HZ support to an arch"
  89         depends on DEBUG_KERNEL
  90         help
  91           This option provides consistency checks in RCU's handling of
  92           NO_HZ.  These checks have proven quite helpful in detecting
  93           bugs in arch-specific NO_HZ code.
  94
  95           Say N here if you need ultimate kernel/user switch latencies
  96           Say Y if you are unsure
  97
  98 endmenu # "RCU Debugging"