Messages in this thread | | | Date | Thu, 1 Nov 2018 16:02:35 -0700 | From | "Paul E. McKenney" <> | Subject | rcu: enable rcu_normal_after_boot by default for RT |
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> 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?
Thanx, Paul
> diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c > index f56c0fbdf22e..12027723abaf 100644 > --- a/kernel/rcu/update.c > +++ b/kernel/rcu/update.c > @@ -67,7 +67,7 @@ extern int rcu_expedited; /* from sysctl */ > module_param(rcu_expedited, int, 0); > extern int rcu_normal; /* from sysctl */ > module_param(rcu_normal, int, 0); > -static int rcu_normal_after_boot; > +static int rcu_normal_after_boot = IS_ENABLED(CONFIG_PREEMPT_RT_FULL); > module_param(rcu_normal_after_boot, int, 0); > #endif /* #ifndef CONFIG_TINY_RCU */ >
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