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

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Date:   Fri, 10 Jul 2020 09:34:45 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     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
Cc:     willy.mh.wolff.ml@...il.com, k.konieczny@...sung.com,
        b.zolnierkie@...sung.com, krzk@...nel.org, 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

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.

Regards,
Lukasz