linux-kernel - Re: [RFC PATCH 0/2] PM / devfreq: Add delayed timer for polling

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Message-ID: <cea8d850-131f-6121-6d96-8b8dc2a33432@arm.com>
Date:   Wed, 8 Jul 2020 15:01:19 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     Chanwoo Choi <cw00.choi@...sung.com>, k.konieczny@...sung.com,
        krzk@...nel.org, kgene@...nel.org
Cc:     s.nawrocki@...sung.com, willy.mh.wolff.ml@...il.com,
        b.zolnierkie@...sung.com, chanwoo@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 0/2] PM / devfreq: Add delayed timer for polling

Hi all,

On 7/3/20 7:26 AM, Chanwoo Choi wrote:
> Add the delayed timer to devfreq framework in order to support
> the periodical polling mode without stop caused by CPU idle state.
> Some Non-CPU device must need to monitor the device status like
> utilization regardless of CPU state.
> 
> - patch1 explains the detailed reason why the delayed timer is required.
> - patch2 initializes that exynos5422-dmc device use delayed timer as default
> instead of deferrable timer.
> 
> Chanwoo Choi (2):
>    PM / devfreq: Add support delayed timer for polling mode
>    memory: samsung: exynos5422-dmc: Use delayed timer as default
> 
>   Documentation/ABI/testing/sysfs-class-devfreq | 12 +++
>   drivers/devfreq/devfreq.c                     | 83 ++++++++++++++++++-
>   drivers/memory/samsung/exynos5422-dmc.c       |  1 +
>   include/linux/devfreq.h                       |  9 ++
>   4 files changed, 104 insertions(+), 1 deletion(-)
> 


My apologizes for being late for the party. I wasn't able to run tests
and I had to fix my setup after I messed up some scripts.

The patch set looks good to me, so you can add my (to both patches):

Reviewed-by: Lukasz Luba <lukasz.luba@....com>

I have run these Willy's benchmark tests and I will send some
follow up patches in a few minutes.

Regards,
Lukasz