Re: rcu: enable rcu_normal_after_boot by default for RT

[Paul E. McKenney]

On Thu, Nov 08, 2018 at 04:52:26PM +0100, Sebastian Andrzej Siewior wrote:
> On 2018-11-01 16:02:35 [-0700], Paul E. McKenney wrote:
> > > The forcing of an expedited grace period is an expensive and very
> > > RT-application unfriendly operation, as it forcibly preempts all running
> > > tasks on CPUs which are preventing the gp from expiring.
> > > 
> > > By default, as a policy decision, disable the expediting of grace
> > > periods (after boot) on configurations which enable PREEMPT_RT_FULL.
> > > 
> > > Suggested-by: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
> > > Signed-off-by: Julia Cartwright <julia@xxxxxx>
> > > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> > 
> > In case it matters:
> > 
> > Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
> > 
> > Alternatively, any reason that I should not pull this into -rcu?

> because we don't have CONFIG_PREEMPT_RT_FULL yet.

Fair enough.  This particular case works without CONFIG_PREEMPT_RT_FULL
defined, but up to you guys.

							Thanx, Paul