rcu-tasks: Add an RCU-tasks rude variant

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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. ]

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This commit is contained in:

Paul E. McKenney 2020-03-02 21:06:43 -08:00

parent 5873b8a94e

commit c84aad7654

3 changed files with 111 additions and 1 deletions

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3

include/linux/rcupdate.h

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11

kernel/rcu/Kconfig

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98

kernel/rcu/tasks.h

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