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

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Date:   Thu, 4 Oct 2018 09:57:03 +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 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

>  {
>  	return atomic_read(&cpu_rq(cpu)->nr_iowait);
>  }
>  
> -void get_iowait_load(unsigned long *nr_waiters, unsigned long *load)
> -{
> -	struct rq *rq = this_rq();
> -	*nr_waiters = atomic_read(&rq->nr_iowait);
> -	*load = rq->load.weight;
> -}
> -
>  /*
>   * IO-wait accounting, and how its mostly bollocks (on SMP).
>   *

I'm obviously all for this :-)