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Date: Thu, 14 Feb 2013 14:48:34 +0900 From: Joonsoo Kim <iamjoonsoo.kim@....com> To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org> Cc: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com> Subject: [PATCH 1/8] sched: change position of resched_cpu() in load_balance() cur_ld_moved is reset if env.flags hit LBF_NEED_BREAK. So, there is possibility that we miss doing resched_cpu(). Correct it as changing position of resched_cpu() before checking LBF_NEED_BREAK. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 81fa536..6f72851 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5070,17 +5070,17 @@ more_balance: double_rq_unlock(env.dst_rq, busiest); local_irq_restore(flags); - if (env.flags & LBF_NEED_BREAK) { - env.flags &= ~LBF_NEED_BREAK; - goto more_balance; - } - /* * some other cpu did the load balance for us. */ if (cur_ld_moved && env.dst_cpu != smp_processor_id()) resched_cpu(env.dst_cpu); + if (env.flags & LBF_NEED_BREAK) { + env.flags &= ~LBF_NEED_BREAK; + goto more_balance; + } + /* * Revisit (affine) tasks on src_cpu that couldn't be moved to * us and move them to an alternate dst_cpu in our sched_group -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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