diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2022-03-17 13:29:59 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-20 16:53:19 -0700 |
| commit | 40c1278aa7cd51d4f8627f7adc66aa73e01aff81 (patch) | |
| tree | 75e85f8aaa887b0e09877cd299f5dd1397e658ed /kernel/rcu/Kconfig | |
| parent | 835f14ed53076384f0e1dad2fddb4881315f124f (diff) | |
rcutorture: Allow rcutorture without RCU Tasks Trace
Unless a kernel builds rcutorture, whether built-in or as a module, that
kernel is also built with CONFIG_TASKS_TRACE_RCU, whether anything else
needs Tasks Trace RCU or not. This unnecessarily increases kernel size.
This commit therefore decouples the presence of rcutorture from the
presence of RCU Tasks Trace.
However, there is a need to select CONFIG_TASKS_TRACE_RCU for
testing purposes. Except that casual users must not be bothered with
questions -- for them, this needs to be fully automated. There is thus
a CONFIG_FORCE_TASKS_TRACE_RCU that selects CONFIG_TASKS_TRACE_RCU,
is user-selectable, but which depends on CONFIG_RCU_EXPERT.
[ paulmck: Apply kernel test robot feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/Kconfig')
| -rw-r--r-- | kernel/rcu/Kconfig | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index 4f665ae0cf55..2befd328e6a0 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -95,15 +95,23 @@ config TASKS_RUDE_RCU switches on all online CPUs, including idle ones, so use with caution. -config TASKS_TRACE_RCU - def_bool 0 - select IRQ_WORK +config FORCE_TASKS_TRACE_RCU + bool "Force selection of Tasks Trace RCU" + depends on RCU_EXPERT + select TASKS_TRACE_RCU + default n help This option enables a task-based RCU implementation that uses explicit rcu_read_lock_trace() read-side markers, and allows - these readers to appear in the idle loop as well as on the CPU - hotplug code paths. It can force IPIs on online CPUs, including - idle ones, so use with caution. + these readers to appear in the idle loop as well as on the + CPU hotplug code paths. It can force IPIs on online CPUs, + including idle ones, so use with caution. Not for manual + selection in most cases. + +config TASKS_TRACE_RCU + bool + default n + select IRQ_WORK config RCU_STALL_COMMON def_bool TREE_RCU @@ -227,7 +235,7 @@ config RCU_NOCB_CPU config TASKS_TRACE_RCU_READ_MB bool "Tasks Trace RCU readers use memory barriers in user and idle" - depends on RCU_EXPERT + depends on RCU_EXPERT && TASKS_TRACE_RCU default PREEMPT_RT || NR_CPUS < 8 help Use this option to further reduce the number of IPIs sent |