linux-kernel - [PATCH 1/1] thermal: sysfs: avoid actual readings from sysfs

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Date:   Fri, 30 Jun 2023 18:38:43 -0700
From:   Eduardo Valentin <evalenti@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Eduardo Valentin <evalenti@...nel.org>, eduval@...zon.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Subject: [PATCH 1/1] thermal: sysfs: avoid actual readings from sysfs

Hey Daniel,

On Fri, Jun 30, 2023 at 12:11:25PM +0200, Daniel Lezcano wrote:
> 
> 
> 
> Hi Rafael,
> 
> On 30/06/2023 10:16, Rafael J. Wysocki wrote:
> > On Wed, Jun 28, 2023 at 11:10 PM Eduardo Valentin <evalenti@...nel.org> wrote:
> 
> [ ... ]
> 
> > So what about adding a new zone attribute that can be used to specify
> > the preferred caching time for the temperature?
> > 
> > That is, if the time interval between two consecutive updates of the
> > cached temperature value is less than the value of the new attribute,
> > the cached temperature value will be returned by "temp".  Otherwise,
> > it will cause the sensor to be read and the value obtained from it
> > will be returned to user space and cached.
> > 
> > If the value of the new attribute is 0, everything will work as it
> > does now (which will also need to be the default behavior).
> 
> I'm still not convinced about the feature.
> 
> Eduardo provided some numbers but they seem based on the characteristics
> of the I2C, not to a real use case. Eduardo?

Why I2C is not a real use case?



-- 
All the best,
Eduardo Valentin