linux-kernel - Re: [PATCH 1/2] memory: samsung: exynos5422-dmc: Adjust polling interval and uptreshold

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Date:   Fri, 10 Jul 2020 14:45:03 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, willy.mh.wolff.ml@...il.com,
        k.konieczny@...sung.com, b.zolnierkie@...sung.com,
        chanwoo@...nel.org, myungjoo.ham@...sung.com,
        kyungmin.park@...sung.com, s.nawrocki@...sung.com, kgene@...nel.org
Subject: Re: [PATCH 1/2] memory: samsung: exynos5422-dmc: Adjust polling
 interval and uptreshold

On Fri, Jul 10, 2020 at 09:34:45AM +0100, Lukasz Luba wrote:
> Hi Chanwoo,
> 
> On 7/9/20 5:08 AM, Chanwoo Choi wrote:
> > Hi Lukasz,
> > 
> > On 7/9/20 12:34 AM, Lukasz Luba wrote:
> > > In order to react faster and make better decisions under some workloads,
> > > benchmarking the memory subsystem behavior, adjust the polling interval
> > > and upthreshold value used by the simple_ondemand governor.
> > > 
> > > Reported-by: Willy Wolff <willy.mh.wolff.ml@...il.com>
> > > Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> > > ---
> > >   drivers/memory/samsung/exynos5422-dmc.c | 4 ++--
> > >   1 file changed, 2 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
> > > index 93e9c2429c0d..e03ee35f0ab5 100644
> > > --- a/drivers/memory/samsung/exynos5422-dmc.c
> > > +++ b/drivers/memory/samsung/exynos5422-dmc.c
> > > @@ -1466,10 +1466,10 @@ static int exynos5_dmc_probe(struct platform_device *pdev)
> > >   		 * Setup default thresholds for the devfreq governor.
> > >   		 * The values are chosen based on experiments.
> > >   		 */
> > > -		dmc->gov_data.upthreshold = 30;
> > > +		dmc->gov_data.upthreshold = 10;
> > >   		dmc->gov_data.downdifferential = 5;
> > > -		exynos5_dmc_df_profile.polling_ms = 500;
> > > +		exynos5_dmc_df_profile.polling_ms = 100;
> > >   	}
> > > 
> > 
> > Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
> > 
> 
> Thank you for the review. Do you think this patch could go through
> your tree together with your patches?
> 
> I don't know Krzysztof's opinion about the patch 2/2, but
> I would expect, assuming the patch itself is correct, he would
> like to take it into his next/dt branch.

In the cover letter you mentioned that this is a follow up for the
Chanwoo's patchset. But are these patches really depending on it? Can
they be picked up independently?

The DTS patch must go through arm soc, so I will take it. If it really
depends on driver changes, then it has to wait for next release.

Best regards,
Krzysztof