path: root/tools/testing/selftests/rcutorture/bin/jitter.sh
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authorPaul E. McKenney <paulmck@kernel.org>2021-02-25 17:36:06 -0800
committerPaul E. McKenney <paulmck@kernel.org>2021-03-24 17:16:15 -0700
commit0909fc2b2c41aae50a18a36ac2858d156f521871 (patch)
tree593ed162e57898257c277f10380a95a3fa0a034c /tools/testing/selftests/rcutorture/bin/jitter.sh
parentrcu: Provide polling interfaces for Tree RCU grace periods (diff)
rcu: Provide polling interfaces for Tiny RCU grace periods
There is a need for a non-blocking polling interface for RCU grace periods, so this commit supplies start_poll_synchronize_rcu() and poll_state_synchronize_rcu() for this purpose. Note that the existing get_state_synchronize_rcu() may be used if future grace periods are inevitable (perhaps due to a later call_rcu() invocation). The new start_poll_synchronize_rcu() is to be used if future grace periods might not otherwise happen. Finally, poll_state_synchronize_rcu() provides a lockless check for a grace period having elapsed since the corresponding call to either of the get_state_synchronize_rcu() or start_poll_synchronize_rcu(). As with get_state_synchronize_rcu(), the return value from either get_state_synchronize_rcu() or start_poll_synchronize_rcu() is passed in to a later call to either poll_state_synchronize_rcu() or the existing (might_sleep) cond_synchronize_rcu(). [ paulmck: Revert cond_synchronize_rcu() to might_sleep() per Frederic Weisbecker feedback. ] Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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