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sched: Unthrottle rt runqueues in __disable_runtime()
migrate_tasks() uses _pick_next_task_rt() to get tasks from the real-time runqueues to be migrated. When rt_rq is throttled _pick_next_task_rt() won't return anything, in which case migrate_tasks() can't move all threads over and gets stuck in an infinite loop. Instead unthrottle rt runqueues before migrating tasks. Additionally: move unthrottle_offline_cfs_rqs() to rq_offline_fair() Signed-off-by: Peter Boonstoppel <pboonstoppel@nvidia.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Turner <pjt@google.com> Link: http://lkml.kernel.org/r/5FBF8E85CA34454794F0F7ECBA79798F379D3648B7@HQMAIL04.nvidia.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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4 changed files with 6 additions and 6 deletions
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@ -5342,9 +5342,6 @@ static void migrate_tasks(unsigned int dead_cpu)
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*/
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rq->stop = NULL;
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/* Ensure any throttled groups are reachable by pick_next_task */
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unthrottle_offline_cfs_rqs(rq);
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for ( ; ; ) {
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/*
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* There's this thread running, bail when that's the only
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@ -2052,7 +2052,7 @@ static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
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hrtimer_cancel(&cfs_b->slack_timer);
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}
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void unthrottle_offline_cfs_rqs(struct rq *rq)
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static void unthrottle_offline_cfs_rqs(struct rq *rq)
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{
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struct cfs_rq *cfs_rq;
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@ -2106,7 +2106,7 @@ static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
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return NULL;
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}
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static inline void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
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void unthrottle_offline_cfs_rqs(struct rq *rq) {}
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static inline void unthrottle_offline_cfs_rqs(struct rq *rq) {}
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#endif /* CONFIG_CFS_BANDWIDTH */
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@ -4956,6 +4956,9 @@ static void rq_online_fair(struct rq *rq)
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static void rq_offline_fair(struct rq *rq)
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{
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update_sysctl();
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/* Ensure any throttled groups are reachable by pick_next_task */
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unthrottle_offline_cfs_rqs(rq);
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}
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#endif /* CONFIG_SMP */
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@ -691,6 +691,7 @@ static void __disable_runtime(struct rq *rq)
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* runtime - in which case borrowing doesn't make sense.
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*/
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rt_rq->rt_runtime = RUNTIME_INF;
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rt_rq->rt_throttled = 0;
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raw_spin_unlock(&rt_rq->rt_runtime_lock);
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raw_spin_unlock(&rt_b->rt_runtime_lock);
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}
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@ -1144,7 +1144,6 @@ extern void print_rt_stats(struct seq_file *m, int cpu);
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extern void init_cfs_rq(struct cfs_rq *cfs_rq);
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extern void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq);
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extern void unthrottle_offline_cfs_rqs(struct rq *rq);
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extern void account_cfs_bandwidth_used(int enabled, int was_enabled);
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