On Wed, Nov 10, 2010 at 03:36:52PM -0800, Randy Dunlap wrote:
> On 11/10/10 15:07, Paul E. McKenney wrote:
> > On Wed, Nov 10, 2010 at 09:19:26AM -0800, Randy Dunlap wrote:
> >> On Wed, 10 Nov 2010 14:07:19 +1100 Stephen Rothwell wrote:
> >>
> >>> Hi all,
> >>>
> >>> Changes since 20101109:
> >>
> >>
> >> when CONFIG_RCU_BOOST is not enabled:
> >>
> >> In file included from linux-next-20101110/kernel/rcutiny.c:53:
> >> linux-next-20101110/kernel/rcutiny_plugin.h: In function 'rcu_preempt_cpu_qs':
> >> linux-next-20101110/kernel/rcutiny_plugin.h:413: error: 'struct rcu_preempt_ctrlblk' has no member named 'n_normal_balk_blkd_tasks'
> >
> > Hello, Randy,
> >
> > Good catch! Could you please try the following patch?
>
> (you tested this build, didn't you?)
Obviously not well enough.
> Yes, this builds. Thanks.
Thank you!
Thanx, Paul
> Acked-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
>
>
> > ------------------------------------------------------------------------
> >
> > diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h
> > index 297aa35..8cd197c 100644
> > --- a/kernel/rcutiny_plugin.h
> > +++ b/kernel/rcutiny_plugin.h
> > @@ -297,9 +297,17 @@ static int rcu_boost(void)
> > * the current grace period, and, if so, tell the rcu_kthread_task to
> > * start boosting them. If there is an expedited boost in progress,
> > * we wait for it to complete.
> > + *
> > + * If there are no blocked readers blocking the current grace period,
> > + * return 0 to let the caller know, otherwise return 1. Note that this
> > + * return value is independent of whether or not boosting was done.
> > */
> > -static void rcu_initiate_boost(void)
> > +static int rcu_initiate_boost(void)
> > {
> > + if (!rcu_preempt_blocked_readers_cgp()) {
> > + RCU_TRACE(rcu_preempt_ctrlblk.n_normal_balk_blkd_tasks++);
> > + return 0;
> > + }
> > if (rcu_preempt_ctrlblk.gp_tasks != NULL &&
> > rcu_preempt_ctrlblk.boost_tasks == NULL &&
> > rcu_preempt_ctrlblk.boosted_this_gp == 0 &&
> > @@ -309,6 +317,7 @@ static void rcu_initiate_boost(void)
> > RCU_TRACE(rcu_preempt_ctrlblk.n_normal_boosts++);
> > } else
> > RCU_TRACE(rcu_initiate_boost_trace());
> > + return 1;
> > }
> >
> > /*
> > @@ -353,10 +362,13 @@ static int rcu_boost(void)
> > }
> >
> > /*
> > - * If there is no RCU priority boosting, we don't initiate boosting.
> > + * If there is no RCU priority boosting, we don't initiate boosting,
> > + * but we do indicate whether there are blocked readers blocking the
> > + * current grace period.
> > */
> > -static void rcu_initiate_boost(void)
> > +static int rcu_initiate_boost(void)
> > {
> > + return rcu_preempt_blocked_readers_cgp();
> > }
> >
> > /*
> > @@ -405,12 +417,12 @@ static void rcu_preempt_cpu_qs(void)
> > /* If there is no GP then there is nothing more to do. */
> > if (!rcu_preempt_gp_in_progress())
> > return;
> > - /* If there are blocked readers, go check up on boosting. */
> > - if (rcu_preempt_blocked_readers_cgp()) {
> > - rcu_initiate_boost();
> > + /*
> > + * Check up on boosting. If there are no readers blocking the
> > + * current grace period, leave.
> > + */
> > + if (rcu_initiate_boost())
> > return;
> > - } else
> > - RCU_TRACE(rcu_preempt_ctrlblk.n_normal_balk_blkd_tasks++);
> >
> > /* Advance callbacks. */
> > rcu_preempt_ctrlblk.completed = rcu_preempt_ctrlblk.gpnum;
>
>
> --
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
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