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| author | Paul E. McKenney <paulmck@kernel.org> | 2021-03-04 14:46:59 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-05-10 16:04:24 -0700 |
| commit | 9fc98e3143de7b7e8d766aef41b46ec0bc0ae4ca (patch) | |
| tree | 0a02c503c171aa6b00d890d8c232153d03b6914b /kernel/rcu | |
| parent | 06a3ec9205d570526665c2071d1a5492c3091a54 (diff) | |
rcu-tasks: Add block comment laying out RCU Rude design
This commit adds a block comment that gives a high-level overview of
how RCU Rude grace periods progress. It also gives an overview of the
memory ordering.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tasks.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 94d2c2c7f0ab..d6aa352cd705 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -645,8 +645,13 @@ void exit_tasks_rcu_finish(void) { exit_tasks_rcu_finish_trace(current); } // passing an empty function to schedule_on_each_cpu(). This approach // provides an asynchronous call_rcu_tasks_rude() API and batching // of concurrent calls to the synchronous synchronize_rcu_rude() API. -// This sends IPIs far and wide and induces otherwise unnecessary context -// switches on all online CPUs, whether idle or not. +// This invokes schedule_on_each_cpu() in order to send IPIs far and wide +// and induces otherwise unnecessary context switches on all online CPUs, +// whether idle or not. +// +// Callback handling is provided by the rcu_tasks_kthread() function. +// +// Ordering is provided by the scheduler's context-switch code. // Empty function to allow workqueues to force a context switch. static void rcu_tasks_be_rude(struct work_struct *work) |