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Message-ID: <1392949390-9867-1-git-send-email-leiwen@marvell.com> Date: Fri, 21 Feb 2014 10:23:10 +0800 From: Lei Wen <leiwen@...vell.com> To: Peter Zijlstra <peterz@...radead.org>, Lei Wen <leiwen@...vell.com>, <mingo@...hat.com>, <preeti.lkml@...il.com>, <daniel.lezcano@...aro.org>, <viresh.kumar@...aro.org>, <xjian@...vell.com>, <linux-kernel@...r.kernel.org> Subject: [PATCH v2] sched: keep quiescent cpu out of idle balance loop Cpu which is put into quiescent mode, would remove itself from kernel's sched_domain, and want others not disturb its task running. But current scheduler would not checking whether that cpu is setting in such mode, and still insist the quiescent cpu to response the nohz load balance. Fix it by preventing such cpu set nohz.idle_cpus_mask in the first place. Signed-off-by: Lei Wen <leiwen@...vell.com> --- kernel/sched/fair.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 235cfa7..66194fc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6883,6 +6883,13 @@ void nohz_balance_enter_idle(int cpu) if (!cpu_active(cpu)) return; + /* + * If this cpu is kept outside of root domain, we don't bother + * to ask it for nohz balance. + */ + if (!cpumask_test_cpu(cpu, this_rq()->rd->span)) + return; + if (test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu))) return; -- 1.8.3.2 -- 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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