linux-kernel - Re: [PATCH] PM / EM: Micro optimization in em_pd

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Date:   Mon, 23 Nov 2020 16:14:29 +0530
From:   Pavan Kondeti <pkondeti@...eaurora.org>
To:     Quentin Perret <qperret@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Lukasz Luba <lukasz.luba@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH] PM / EM: Micro optimization in em_pd_energy

On Mon, Nov 23, 2020 at 10:28:39AM +0000, Quentin Perret wrote:
> Hi Pavan,
> 
> On Monday 23 Nov 2020 at 15:47:57 (+0530), Pavankumar Kondeti wrote:
> > When the sum of the utilization of CPUs in a power domain is zero,
> 
> s/power/performance
> 
> > return the energy as 0 without doing any computations.
> > 
> > Signed-off-by: Pavankumar Kondeti <pkondeti@...eaurora.org>
> > ---
> >  include/linux/energy_model.h | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
> > index b67a51c..8810f1f 100644
> > --- a/include/linux/energy_model.h
> > +++ b/include/linux/energy_model.h
> > @@ -103,6 +103,9 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd,
> >  	struct em_perf_state *ps;
> >  	int i, cpu;
> >  
> > +	if (!sum_util)
> > +		return 0;
> > +
> >  	/*
> >  	 * In order to predict the performance state, map the utilization of
> >  	 * the most utilized CPU of the performance domain to a requested
> 
> Makes sense to me, so with nit above:
> 
> Acked-by: Quentin Perret <qperret@...gle.com>
> 
Thanks Quentin. I have updated the patch as per your correction. 

Thanks,
Pavan

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