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 default n 33 help 34 This option provides a kernel module that runs performance 35 tests on the RCU infrastructure. The kernel module may be built 36 after the fact on the running kernel to be tested, if desired. 37 38 Say Y here if you want RCU performance tests to be built into 39 the kernel. 40 Say M if you want the RCU performance tests to build as a module. 41 Say N if you are unsure. 42 43config RCU_TORTURE_TEST 44 tristate "torture tests for RCU" 45 depends on DEBUG_KERNEL 46 select TORTURE_TEST 47 select SRCU 48 select TASKS_RCU 49 default n 50 help 51 This option provides a kernel module that runs torture tests 52 on the RCU infrastructure. The kernel module may be built 53 after the fact on the running kernel to be tested, if desired. 54 55 Say Y here if you want RCU torture tests to be built into 56 the kernel. 57 Say M if you want the RCU torture tests to build as a module. 58 Say N if you are unsure. 59 60config RCU_CPU_STALL_TIMEOUT 61 int "RCU CPU stall timeout in seconds" 62 depends on RCU_STALL_COMMON 63 range 3 300 64 default 21 65 help 66 If a given RCU grace period extends more than the specified 67 number of seconds, a CPU stall warning is printed. If the 68 RCU grace period persists, additional CPU stall warnings are 69 printed at more widely spaced intervals. 70 71config RCU_TRACE 72 bool "Enable tracing for RCU" 73 depends on DEBUG_KERNEL 74 default y if TREE_RCU 75 select TRACE_CLOCK 76 help 77 This option enables additional tracepoints for ftrace-style 78 event tracing. 79 80 Say Y here if you want to enable RCU tracing 81 Say N if you are unsure. 82 83config RCU_EQS_DEBUG 84 bool "Provide debugging asserts for adding NO_HZ support to an arch" 85 depends on DEBUG_KERNEL 86 help 87 This option provides consistency checks in RCU's handling of 88 NO_HZ. These checks have proven quite helpful in detecting 89 bugs in arch-specific NO_HZ code. 90 91 Say N here if you need ultimate kernel/user switch latencies 92 Say Y if you are unsure 93 94endmenu # "RCU Debugging" 95