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Commit baa8c110 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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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: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 230059de

kernel/sched_fair.c

+4 −0
Original line number Diff line number Diff line
@@ -2065,6 +2065,10 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest, 
		 */

		if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)

			break;



		if (raw_spin_is_contended(&this_rq->lock) ||

				raw_spin_is_contended(&busiest->lock))

			break;

#endif

	} while (load_moved && max_load_move > total_load_moved);