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