sched: fix buddies for group scheduling
Impact: scheduling order fix for group scheduling For each level in the hierarchy, set the buddy to point to the right entity. Therefore, when we do the hierarchical schedule, we have a fair chance of ending up where we meant to. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -1319,6 +1319,18 @@ wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
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return 0;
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}
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static void set_last_buddy(struct sched_entity *se)
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{
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for_each_sched_entity(se)
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cfs_rq_of(se)->last = se;
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}
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static void set_next_buddy(struct sched_entity *se)
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{
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for_each_sched_entity(se)
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cfs_rq_of(se)->next = se;
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}
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/*
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* Preempt the current task with a newly woken task if needed:
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*/
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@ -1352,8 +1364,8 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
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* obvious reasons its a bad idea to schedule back to the idle thread.
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*/
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if (sched_feat(LAST_BUDDY) && likely(se->on_rq && curr != rq->idle))
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cfs_rq_of(se)->last = se;
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cfs_rq_of(pse)->next = pse;
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set_last_buddy(se);
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set_next_buddy(pse);
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/*
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* We can come here with TIF_NEED_RESCHED already set from new task
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