rcu-tasks: Use separate ->percpu_dequeue_lim for callback dequeueing

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Decreasing the number of callback queues is a bit tricky because it
is necessary to handle callbacks that were queued before the number of
queues decreased, but which were not ready to invoke until afterwards.
This commit takes a first step in this direction by maintaining a separate
->percpu_dequeue_lim to control callback dequeueing, in addition to the
existing ->percpu_enqueue_lim which now controls only enqueueing.

Reported-by: Martin Lau <kafai@fb.com>
Cc: Neeraj Upadhyay <neeraj.iitr10@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Paul E. McKenney 2021-11-29 11:46:33 -08:00

parent ab97152f88

commit 2cee0789b4

1 changed files with 10 additions and 5 deletions

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kernel/rcu/tasks.h

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