linux-kernel - Re: rcu: enable rcu_normal_after

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Message-ID: <20181108155225.d2m6sx5z7tvzurft@linutronix.de>
Date:   Thu, 8 Nov 2018 16:52:26 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     lcapitulino@...hat.com, julia@...com,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: rcu: enable rcu_normal_after_boot by default for RT

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@...hat.com>
> > Signed-off-by: Julia Cartwright <julia@...com>
> > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
> In case it matters:
> 
> Acked-by: Paul E. McKenney <paulmck@...ux.ibm.com>
> 
> Alternatively, any reason that I should not pull this into -rcu?
because we don't have CONFIG_PREEMPT_RT_FULL yet.
> 							Thanx, Paul

Sebastian