linux-kernel - Re: [RFC PATCH v4 08/12] sched: Add over-utilization/tipping point indicator

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Message-ID: <20180706114158.GU2458@hirez.programming.kicks-ass.net>
Date:   Fri, 6 Jul 2018 13:41:58 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Quentin Perret <quentin.perret@....com>
Cc:     rjw@...ysocki.net, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, gregkh@...uxfoundation.org,
        mingo@...hat.com, dietmar.eggemann@....com,
        morten.rasmussen@....com, chris.redpath@....com,
        patrick.bellasi@....com, valentin.schneider@....com,
        vincent.guittot@...aro.org, thara.gopinath@...aro.org,
        viresh.kumar@...aro.org, tkjos@...gle.com, joel@...lfernandes.org,
        smuckle@...gle.com, adharmap@...cinc.com, skannan@...cinc.com,
        pkondeti@...eaurora.org, juri.lelli@...hat.com,
        edubezval@...il.com, srinivas.pandruvada@...ux.intel.com,
        currojerez@...eup.net, javi.merino@...nel.org
Subject: Re: [RFC PATCH v4 08/12] sched: Add over-utilization/tipping point
 indicator

On Thu, Jun 28, 2018 at 12:40:39PM +0100, Quentin Perret wrote:
> @@ -698,6 +698,9 @@ struct root_domain {
>  	/* Indicate more than one runnable task for any CPU */
>  	bool			overload;

While there, make that an int.

> +	/* Indicate one or more cpus over-utilized (tipping point) */
> +	int			overutilized;
> +
>  	/*
>  	 * The bit corresponding to a CPU gets set here if such CPU has more
>  	 * than one runnable -deadline task (as it is below for RT tasks).
> -- 
> 2.17.1
>