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doc: Use rcu_barrier() to rate-limit RCU callbacks 

The checklist.rst document advises periodic synchronize_rcu() invocations
to prevent callback flooding.  However, rcu_barrier() is often a better
choice.  This commit therefore adds words to this effect.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2022-07-28 12:04:00 -07:00
parent ed336c6fe4
commit 1c1c1d983e
1 changed files with 2 additions and 1 deletions
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Documentation/RCU/checklist.rst
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@ -305,7 +305,8 @@ over a rather long period of time, but improvements are always welcome!
the machine.
d. Periodically invoke synchronize_rcu(), permitting a limited
number of updates per grace period.
number of updates per grace period. Better yet, periodically
invoke rcu_barrier() to wait for all outstanding callbacks.
The same cautions apply to call_srcu() and kfree_rcu().