Messages in this thread | | | Subject | Re: [PATCH] sched/fair: Fix RCU stall upon ENOMEM atsched_create_group(). | From | Tetsuo Handa <> | Date | Tue, 6 Jan 2015 23:45:29 +0900 |
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Peter Zijlstra wrote: > On Thu, Dec 25, 2014 at 10:10:45PM +0900, Tetsuo Handa wrote: > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > > index ef2b104..586ee15 100644 > > --- a/kernel/sched/fair.c > > +++ b/kernel/sched/fair.c > > @@ -7756,8 +7756,12 @@ static void task_move_group_fair(struct task_struct *p, int queued) > > void free_fair_sched_group(struct task_group *tg) > > { > > int i; > > + struct cfs_bandwidth *cfs_b; > > > > - destroy_cfs_bandwidth(tg_cfs_bandwidth(tg)); > > + /* Check whether init_cfs_bandwidth() was called. */ > > + cfs_b = tg_cfs_bandwidth(tg); > > + if (cfs_b->throttled_cfs_rq.next) > > + destroy_cfs_bandwidth(cfs_b); > > > > for_each_possible_cpu(i) { > > if (tg->cfs_rq) > > This doesn't actually compile for !CONFIG_CFS_BANDWIDTH, how about: > > --- > --- a/kernel/sched/fair.c > +++ b/kernel/sched/fair.c > @@ -4005,6 +4005,10 @@ void __start_cfs_bandwidth(struct cfs_ba > > static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) > { > + /* init_cfs_bandwidth() was not called */ > + if (!cfs_b->throttled_cfs_rq.next) > + return; > + > hrtimer_cancel(&cfs_b->period_timer); > hrtimer_cancel(&cfs_b->slack_timer); > } > I posted "#ifdef CONFIG_CFS_BANDWIDTH" version 7 minutes ago. But I'm fine with your patch. Thank you.
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