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rcu-tasks: Add block comment laying out RCU Rude design

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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>
This commit is contained in:
Paul E. McKenney 2021-03-04 14:46:59 -08:00
parent 06a3ec9205
commit 9fc98e3143
1 changed files with 7 additions and 2 deletions
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9
kernel/rcu/tasks.h
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@ -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)