linux-kernel - Re: [Patch v5 2/6] sched/fair: Add infrastructure to store and update instantaneous thermal pressure

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Date:   Tue, 5 Nov 2019 21:15:24 +0000
From:   Ionela Voinescu <ionela.voinescu@....com>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     mingo@...hat.com, peterz@...radead.org, vincent.guittot@...aro.org,
        rui.zhang@...el.com, edubezval@...il.com, qperret@...gle.com,
        linux-kernel@...r.kernel.org, amit.kachhap@...il.com,
        javi.merino@...nel.org, daniel.lezcano@...aro.org
Subject: Re: [Patch v5 2/6] sched/fair: Add infrastructure to store and
 update instantaneous thermal pressure

On Tuesday 05 Nov 2019 at 16:02:00 (-0500), Thara Gopinath wrote:
> On 11/05/2019 03:21 PM, Ionela Voinescu wrote:
> > Hi Thara,
> > 
> > On Tuesday 05 Nov 2019 at 13:49:42 (-0500), Thara Gopinath wrote:
> > [...]
> >> +static void trigger_thermal_pressure_average(struct rq *rq)
> >> +{
> >> +#ifdef CONFIG_SMP
> >> +	update_thermal_load_avg(rq_clock_task(rq), rq,
> >> +				per_cpu(thermal_pressure, cpu_of(rq)));
> >> +#endif
> >> +}
> > 
> > Why did you decide to keep trigger_thermal_pressure_average and not
> > call update_thermal_load_avg directly?
> > 
> > For !CONFIG_SMP you already have an update_thermal_load_avg function
> > that does nothing, in kernel/sched/pelt.h, so you don't need that
> > ifdef. 
> Hi,
> 
> Yes you are right. But later with the shift option added, I shift
> rq_clock_task(rq) by the shift. I thought it is better to contain it in
> a function that replicate it in three different places. I can remove the
> CONFIG_SMP in the next version.

You could still keep that in one place if you shift the now argument of
___update_load_sum instead. 

To me that trigger_thermal_pressure_average function seems more code
than it's worth for this.

Thanks,
Ionela.

> > 
> > Thanks,
> > Ionela.
> > 
> >> +
> >>  /*
> >>   * All the scheduling class methods:
> >>   */
> >> -- 
> >> 2.1.4
> >>
> 
> 
> -- 
> Warm Regards
> Thara