Messages in this thread Patch in this message | | | Date | Thu, 17 Dec 2009 19:50:27 +0100 | From | Peter Zijlstra <> | Subject | [PATCH 6/6] sched: Add a lock break for PREEMPT=y |
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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> --- kernel/sched_fair.c | 4 ++++ 1 file changed, 4 insertions(+)
Index: linux-2.6/kernel/sched_fair.c =================================================================== --- linux-2.6.orig/kernel/sched_fair.c +++ linux-2.6/kernel/sched_fair.c @@ -2065,6 +2065,10 @@ static int move_tasks(struct rq *this_rq */ 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); --
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