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Message-Id: <1353343087-18015-4-git-send-email-vincent.guittot@linaro.org> Date: Mon, 19 Nov 2012 17:38:07 +0100 From: Vincent Guittot <vincent.guittot@...aro.org> To: linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org, peterz@...radead.org, mingo@...hat.com Cc: ccross@...roid.com, Vincent Guittot <vincent.guittot@...aro.org> Subject: [RFC 3/3] sched: fix update NOHZ_IDLE flag The function nohz_kick_needed modifies NOHZ_IDLE flag that is used to update the nr_busy_cpus of the sched_group. When the sched_domain are updated (because of the unplug of a CPUs as an example) a null_domain is attached to CPUs. We have to test likely(!on_null_domain(cpu) first in order to detect such intialization step and to not modify the NOHZ_IDLE flag Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org> --- kernel/sched/fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 3d0686c..1bf7c87 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5490,7 +5490,7 @@ void trigger_load_balance(struct rq *rq, int cpu) likely(!on_null_domain(cpu))) raise_softirq(SCHED_SOFTIRQ); #ifdef CONFIG_NO_HZ - if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu))) + if (likely(!on_null_domain(cpu)) && nohz_kick_needed(rq, cpu)) nohz_balancer_kick(cpu); #endif } -- 1.7.10 -- 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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