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SubjectRe: [External] Re: [PATCH] [RFC] Documentation: Add documentation for new platform_profile sysfs attribute
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Hi Elia

On 27/10/2020 05:19, Elia Devito wrote:
> Hi to all,
>
> In data martedì 27 ottobre 2020 08:54:44 CET, Hans de Goede ha scritto:
>> Hi,
>>
>> On 10/26/20 8:55 PM, Mark Pearson wrote:
>>> Thanks Hans
>>>
>>> On 26/10/2020 14:33, Hans de Goede wrote:
>>>> Hi Mark,
>>>>
>>>> Thank you for this new version.
>>>>
>>>> On 10/26/20 6:44 PM, Mark Pearson wrote:
>>>>> From: Hans de Goede <hdegoede@redhat.com>
>>>
>>> <snip>
>>>
>>>>> +
>>>>> +If for some reason there is no good match when mapping then a new
>>>>> profile-name +may be added. Drivers which wish to introduce new
>>>>> profile-names must: +1. Have very good reasons to do so.
>>>>> +2. Add the new profile-name to this document, so that future drivers
>>>>> which also + have a similar problem can use the same new.
>>>>
>>>> s/same new/same name/
>>>
>>> I've read this document so many times...I'm not sure how I missed that
>>> one. Thanks.>
>>>>> + Usually new profile-names will
>>>>> + be added to the "extra profile-names" section of this document. But
>>>>> in some + cases the set of standard profile-names may be extended.
>>>>
>>>> With the change from a more generic API to this new one more targeted
>>>> towards DPTF I would drop this part.
>>>
>>> OK - I have some questions then related to this change, below
>>>
>>>>> +
>>>>> +What: /sys/firmware/acpi/platform_profile_choices
>>>>> +Date: October 2020
>>>>> +Contact: Hans de Goede <hdegoede@redhat.com>
>>>>> +Description:
>>>>> + Reading this file gives a space separated list of profiles
>>>>> + supported for this device.
>>>>> +
>>>>> + Drivers must use the following standard profile-names whenever
>>>>> + possible:
>>>>> +
>>>>> + low-power: Emphasises low power consumption
>>>>> + quiet: Offers quieter operation (lower fan
>>>>> + speed but with higher performance and
>>>>> + temperatures then seen in low-power
>>>>
>>>> I think the description here is a bit too specific, this may cause
>>>> userspace to have expectations which are not necessary true. I would
>>>> describe this as just:
>>>>
>>>> quiet: Emphasises quieter operation
>>>
>>> Agreed. I'll update
>>>
>>>>> + balanced: Balance between low power consumption
>>>>> + and performance
>>>>> + performance: Emphasises performance (and may lead to
>>>>> + higher temperatures and fan speeds)
>>>>> +
>>>>> + Userspace may expect drivers to offer at least several of these
>>>>> + standard profile-names! If none of the above are a good match
>>>>> + for some of the drivers profiles, then drivers may use one of
>>>>> + these extra profile-names:
>>>>> + <reserved for future use>
>>>>> +
>>>
>>> If we remove the extra profile-names section above then I think it should
>>> be removed here too. If someone wants to add a new 'mode' then it would
>>> be added to the list of 'standard names', and becomes a new option.
>>> Wanted to check I'm not missing something important.
>> You are completely right, any references to an extra profile-names section
>> should be removed here too. I did intend to add that it should be removed
>> here too, but I forgot.
>>
>>>>> +What: /sys/firmware/acpi/platform_profile
>>>>> +Date: October 2020
>>>>> +Contact: Hans de Goede <hdegoede@redhat.com>
>>>>> +Description:
>>>>> + Reading this file gives the current selected profile for this
>>>>> + device. Writing this file with one of the strings from
>>>>> + available_profiles changes the profile to the new value.
>>>>
>>>> The part about custom profiles below may be dropped. That was intended
>>>> for use with e.g. GPUs but since this now strictly is a system-level
>>>> profile API, the part below can be dropped now.
>>>
>>> Agreed
>>>
>>>>> +
>>>>> + Reading this file may also return "custom". This is intended
>>>>> for
>>>>> + drivers which have and export multiple knobs. Such drivers may
>>>>> + very well still want to offer a set of profiles for easy of use
>>>>> + and to be able to offer a consistent standard API (this API) to
>>>>> + userspace for configuring their performance. The "custom" value
>>>>> + is intended for when ai user has directly configured the knobs
>>>>> + (through e.g. some advanced control-panel for a GPU) and the
>>>>> + knob values do not match any of the presets represented by the
>>>>> + platform-profiles. In this case writing this file will
>>>>> + override the modifications and restore the selected presets.
>>>>> +
>>>>
>>>> Regards,
>>>>
>>>> Hans
>>>
>>> Thanks!
>>> mark
>>
>> Regards,
>>
>> Hans
>
> This look good,
> only thing is that hp-wmi driver need a cool profile (Emphasises the computer
> cool to touch), if you can add it would be perfect.
>
> Regards
> Elia
>
>
>
Is low-power is different to cool? I figured low-power was going to be
cool so combined them.
I could call it low-power-cool if that helps? It seems a little clunky
but not too bad. I'm sure the user space folks can put sunglasses on it
or something ;)

Mark

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