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

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Message-ID: <7559d0e2-7c5d-3bd3-6123-51fc9a4ca0d4@arm.com>
Date:   Fri, 6 Jul 2018 12:49:30 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        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, 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 06/07/18 12:41, Peter Zijlstra wrote:
> 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.

That's what I've done at [1] - I guess that's the fun part of having those
two patch sets in flight at the same time...

[1]: https://lore.kernel.org/lkml/1530699470-29808-8-git-send-email-morten.rasmussen@arm.com/

> 
>> +	/* 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
>>