diff options
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/Kconfig | 22 | ||||
| -rw-r--r-- | kernel/rcu/Kconfig.debug | 1 | ||||
| -rw-r--r-- | kernel/rcu/rcutorture.c | 101 |
3 files changed, 71 insertions, 53 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 diff --git a/kernel/rcu/Kconfig.debug b/kernel/rcu/Kconfig.debug index 4fd64999300f..d7f4bb1c4979 100644 --- a/kernel/rcu/Kconfig.debug +++ b/kernel/rcu/Kconfig.debug @@ -49,7 +49,6 @@ config RCU_TORTURE_TEST select SRCU select TASKS_RCU select TASKS_RUDE_RCU - select TASKS_TRACE_RCU default n help This option provides a kernel module that runs torture tests diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 55d049c39608..7dd3e14ec907 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -738,6 +738,48 @@ static struct rcu_torture_ops busted_srcud_ops = { }; /* + * Definitions for trivial CONFIG_PREEMPT=n-only torture testing. + * This implementation does not necessarily work well with CPU hotplug. + */ + +static void synchronize_rcu_trivial(void) +{ + int cpu; + + for_each_online_cpu(cpu) { + rcutorture_sched_setaffinity(current->pid, cpumask_of(cpu)); + WARN_ON_ONCE(raw_smp_processor_id() != cpu); + } +} + +static int rcu_torture_read_lock_trivial(void) __acquires(RCU) +{ + preempt_disable(); + return 0; +} + +static void rcu_torture_read_unlock_trivial(int idx) __releases(RCU) +{ + preempt_enable(); +} + +static struct rcu_torture_ops trivial_ops = { + .ttype = RCU_TRIVIAL_FLAVOR, + .init = rcu_sync_torture_init, + .readlock = rcu_torture_read_lock_trivial, + .read_delay = rcu_read_delay, /* just reuse rcu's version. */ + .readunlock = rcu_torture_read_unlock_trivial, + .readlock_held = torture_readlock_not_held, + .get_gp_seq = rcu_no_completed, + .sync = synchronize_rcu_trivial, + .exp_sync = synchronize_rcu_trivial, + .fqs = NULL, + .stats = NULL, + .irq_capable = 1, + .name = "trivial" +}; + +/* * Definitions for RCU-tasks torture testing. */ @@ -781,48 +823,6 @@ static struct rcu_torture_ops tasks_ops = { }; /* - * Definitions for trivial CONFIG_PREEMPT=n-only torture testing. - * This implementation does not necessarily work well with CPU hotplug. - */ - -static void synchronize_rcu_trivial(void) -{ - int cpu; - - for_each_online_cpu(cpu) { - rcutorture_sched_setaffinity(current->pid, cpumask_of(cpu)); - WARN_ON_ONCE(raw_smp_processor_id() != cpu); - } -} - -static int rcu_torture_read_lock_trivial(void) __acquires(RCU) -{ - preempt_disable(); - return 0; -} - -static void rcu_torture_read_unlock_trivial(int idx) __releases(RCU) -{ - preempt_enable(); -} - -static struct rcu_torture_ops trivial_ops = { - .ttype = RCU_TRIVIAL_FLAVOR, - .init = rcu_sync_torture_init, - .readlock = rcu_torture_read_lock_trivial, - .read_delay = rcu_read_delay, /* just reuse rcu's version. */ - .readunlock = rcu_torture_read_unlock_trivial, - .readlock_held = torture_readlock_not_held, - .get_gp_seq = rcu_no_completed, - .sync = synchronize_rcu_trivial, - .exp_sync = synchronize_rcu_trivial, - .fqs = NULL, - .stats = NULL, - .irq_capable = 1, - .name = "trivial" -}; - -/* * Definitions for rude RCU-tasks torture testing. */ @@ -851,6 +851,8 @@ static struct rcu_torture_ops tasks_rude_ops = { .name = "tasks-rude" }; +#ifdef CONFIG_TASKS_TRACE_RCU + /* * Definitions for tracing RCU-tasks torture testing. */ @@ -893,6 +895,15 @@ static struct rcu_torture_ops tasks_tracing_ops = { .name = "tasks-tracing" }; +#define TASKS_TRACING_OPS &tasks_tracing_ops, + +#else // #ifdef CONFIG_TASKS_TRACE_RCU + +#define TASKS_TRACING_OPS + +#endif // #else #ifdef CONFIG_TASKS_TRACE_RCU + + static unsigned long rcutorture_seq_diff(unsigned long new, unsigned long old) { if (!cur_ops->gp_diff) @@ -3096,9 +3107,9 @@ rcu_torture_init(void) int flags = 0; unsigned long gp_seq = 0; static struct rcu_torture_ops *torture_ops[] = { - &rcu_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, - &busted_srcud_ops, &tasks_ops, &tasks_rude_ops, - &tasks_tracing_ops, &trivial_ops, + &rcu_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, &busted_srcud_ops, + &tasks_ops, &tasks_rude_ops, TASKS_TRACING_OPS + &trivial_ops, }; if (!torture_init_begin(torture_type, verbose)) |