From: "Paul E. McKenney" <paulmck@linux.ibm.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: lcapitulino@redhat.com, julia@ni.com,
linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: rcu: enable rcu_normal_after_boot by default for RT
Date: Thu, 8 Nov 2018 08:12:25 -0800 [thread overview]
Message-ID: <20181108161225.GK4170@linux.ibm.com> (raw)
In-Reply-To: <20181108155225.d2m6sx5z7tvzurft@linutronix.de>
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@redhat.com>
> > > Signed-off-by: Julia Cartwright <julia@ni.com>
> > > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> >
> > In case it matters:
> >
> > Acked-by: Paul E. McKenney <paulmck@linux.ibm.com>
> >
> > 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
prev parent reply other threads:[~2018-11-08 16:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-01 23:02 rcu: enable rcu_normal_after_boot by default for RT Paul E. McKenney
2018-11-08 15:52 ` Sebastian Andrzej Siewior
2018-11-08 16:12 ` Paul E. McKenney [this message]
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