Commit-ID: baa8c1102f0cd86e69c1497d61d2ee177e663663 Gitweb: http://git.kernel.org/tip/baa8c1102f0cd86e69c1497d61d2ee177e663663 Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> AuthorDate: Thu, 17 Dec 2009 18:10:09 +0100 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Thu, 21 Jan 2010 13:40:13 +0100 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@xxxxxxxxx> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- kernel/sched_fair.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 93fccba..65d0820 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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