sched: Add a lock break for PREEMPT=y
Since load-balancing can hold rq->locks for quite a long while, allow breaking out early when there is lock contention. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -2065,6 +2065,10 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
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*/
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*/
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if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
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if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
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break;
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break;
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if (raw_spin_is_contended(&this_rq->lock) ||
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raw_spin_is_contended(&busiest->lock))
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break;
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#endif
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#endif
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} while (load_moved && max_load_move > total_load_moved);
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} while (load_moved && max_load_move > total_load_moved);
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