linux-kernel - Re: [PATCH] sched/fair: schedutil: update only with all info available

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Message-ID: <20180411161548.GP4082@hirez.programming.kicks-ass.net>
Date:   Wed, 11 Apr 2018 18:15:48 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Patrick Bellasi <patrick.bellasi@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Steve Muckle <smuckle@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>
Subject: Re: [PATCH] sched/fair: schedutil: update only with all info
 available

On Wed, Apr 11, 2018 at 06:10:47PM +0200, Vincent Guittot wrote:
> > Could is be that for some reason the nohz balancer now takes a very long
> > time to run?
> 
> Heiner mentions that is was a relatively slow celeron and he uses
> ondemand governor. So I was about to ask him to use performance
> governor to see if it can be because cpu runs slow and takes too muche
> time to enter idle

Maybe also hand him a patch with some trace_printk()s in and ask him to
send /debug/tracing/trace after it happens or somesuch. Maybe we can
find a clue that way.