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Re: linux-next: new scheduler messages span: 0-15 (max cpu_capacity = 589) when starting KVM guests

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On Mon, Sep 19, 2016 at 03:19:11PM +0200, Christian Borntraeger wrote:
> Dietmar, Ingo, Tejun,
> 
> since commit cd92bfd3b8cb0ec2ee825e55a3aee704cd55aea9
>    sched/core: Store maximum per-CPU capacity in root domain
> 
> I get tons of messages from the scheduler like
> [..]
> span: 0-15 (max cpu_capacity = 589)
> span: 0-15 (max cpu_capacity = 589)
> span: 0-15 (max cpu_capacity = 589)
> span: 0-15 (max cpu_capacity = 589)
> [..]
> 

Oh, oops ;-)

Something like the below ought to cure I think.

---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f5f7b3cdf0be..fdc9e311fd29 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6990,7 +6990,7 @@ static int build_sched_domains(const struct cpumask *cpu_map,
 	}
 	rcu_read_unlock();
 
-	if (rq) {
+	if (rq && sched_debug_enabled) {
 		pr_info("span: %*pbl (max cpu_capacity = %lu)\n",
 			cpumask_pr_args(cpu_map), rq->rd->max_cpu_capacity);
 	}

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linux-next: new scheduler messages span: 0-15 (max cpu_capacity =  589) when starting KVM guests Christian Borntraeger <borntraeger@de.ibm.com> - 2016-09-19 15:30 +0200
  Re: linux-next: new scheduler messages span: 0-15 (max cpu_capacity  = 589) when starting KVM guests Peter Zijlstra <peterz@infradead.org> - 2016-09-19 15:50 +0200
    Re: linux-next: new scheduler messages span: 0-15 (max cpu_capacity =  589) when starting KVM guests Dietmar Eggemann <dietmar.eggemann@arm.com> - 2016-09-19 16:00 +0200
    Re: linux-next: new scheduler messages span: 0-15 (max cpu_capacity =  589) when starting KVM guests Christian Borntraeger <borntraeger@de.ibm.com> - 2016-09-19 16:10 +0200
    Re: linux-next: new scheduler messages span: 0-15 (max cpu_capacity =  589) when starting KVM guests Christian Borntraeger <borntraeger@de.ibm.com> - 2016-09-20 09:50 +0200

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