Re: [PATCH rcu/next 3/3] rcu: Fix late wakeup when flush of bypass cblist happens

[Frederic Weisbecker]

On Thu, Sep 15, 2022 at 12:14:19AM +0000, Joel Fernandes (Google) wrote:
> When the bypass cblist gets too big or its timeout has occurred, it is
> flushed into the main cblist. However, the bypass timer is still running
> and the behavior is that it would eventually expire and wake the GP
> thread.
> 
> Since we are going to use the bypass cblist for lazy CBs, do the wakeup
> soon as the flush happens. Otherwise, the lazy-timer will go off much
> later and the now-non-lazy cblist CBs can get stranded for the duration
> of the timer.
> 
> This is a good thing to do anyway, since it makes the behavior consistent with
> behavior of other code paths where queueing something into the ->cblist makes
> the GP kthread in a non-sleeping state quickly.
> 
> Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>

Reviewed-by: Frederic Weisbecker <frederic@xxxxxxxxxx>