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| author | Paul E. McKenney <paulmck@kernel.org> | 2020-03-02 21:06:43 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-04-27 11:03:51 -0700 |
| commit | c84aad765406c4c7573ce449e8a9977ebb8f4cb9 (patch) | |
| tree | 32dc99eae3d82ef11ac665489c0cdd0c2661ab01 /kernel/rcu/Kconfig | |
| parent | 5873b8a94e5dae04b8e11fc798df512614e6d1e7 (diff) | |
rcu-tasks: Add an RCU-tasks rude variant
This commit adds a "rude" variant of RCU-tasks that has as quiescent
states schedule(), cond_resched_tasks_rcu_qs(), userspace execution,
and (in theory, anyway) cond_resched(). In other words, RCU-tasks rude
readers are regions of code with preemption disabled, but excluding code
early in the CPU-online sequence and late in the CPU-offline sequence.
Updates make use of IPIs and force an IPI and a context switch on each
online CPU. This variant is useful in some situations in tracing.
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
[ paulmck: Apply EXPORT_SYMBOL_GPL() feedback from Qiujun Huang. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
[ paulmck: Apply review feedback from Steve Rostedt. ]
Diffstat (limited to 'kernel/rcu/Kconfig')
| -rw-r--r-- | kernel/rcu/Kconfig | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index 38475d0bc634..6ee6372a4459 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -71,7 +71,7 @@ config TREE_SRCU This option selects the full-fledged version of SRCU. config TASKS_RCU_GENERIC - def_bool TASKS_RCU + def_bool TASKS_RCU || TASKS_RUDE_RCU select SRCU help This option enables generic infrastructure code supporting @@ -84,6 +84,15 @@ config TASKS_RCU only voluntary context switch (not preemption!), idle, and user-mode execution as quiescent states. Not for manual selection. +config TASKS_RUDE_RCU + def_bool 0 + help + This option enables a task-based RCU implementation that uses + only context switch (including preemption) and user-mode + execution as quiescent states. It forces IPIs and context + switches on all online CPUs, including idle ones, so use + with caution. + config RCU_STALL_COMMON def_bool TREE_RCU help |