linux-kernel - Re: [PATCH 2/2] cpuidle/drivers/menu: Remove get

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Date:   Thu, 4 Oct 2018 11:35:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rafael@...nel.org, rjw@...ysocki.net, linux-pm@...r.kernel.org,
        Todd Kjos <tkjos@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Colin Cross <ccross@...roid.com>,
        Ramesh Thomas <ramesh.thomas@...el.com>,
        Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...hat.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Alex Shi <alex.shi@...aro.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] cpuidle/drivers/menu: Remove get_loadavg in the
 performance multiplier

On Thu, Oct 04, 2018 at 10:12:44AM +0200, Daniel Lezcano wrote:
> 
> Hi Peter,
> 
> On 04/10/2018 09:57, Peter Zijlstra wrote:
> > On Thu, Oct 04, 2018 at 09:42:07AM +0200, Daniel Lezcano wrote:
> >> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> >> index b88a145..5605f03 100644
> >> --- a/kernel/sched/core.c
> >> +++ b/kernel/sched/core.c
> >> @@ -2873,25 +2873,12 @@ unsigned long long nr_context_switches(void)
> >>  
> >>  	return sum;
> >>  }
> >> -/*
> >> - * Consumers of these two interfaces, like for example the cpufreq menu
> >> - * governor are using nonsensical data. Boosting frequency for a CPU that has
> >> - * IO-wait which might not even end up running the task when it does become
> >> - * runnable.
> >> - */
> >>  
> >>  unsigned long nr_iowait_cpu(int cpu)
> >  
> > +static
> 
> The function is exported in include/linux/sched/stat.h and used by
> drivers/cpuidle/governors/menu.c
> 
> Do you want to declare it static inline in the stat.h file ?

No, but if there's a user left, that comment needs to stay. The number
it returns is utter crap.