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From: Hans de Goede <hdegoede@redhat.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	Lukasz Luba <lukasz.luba@arm.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux PM <linux-pm@vger.kernel.org>,
	"Zhang, Rui" <rui.zhang@intel.com>,
	Bastien Nocera <hadess@hadess.net>,
	Mark Pearson <mpearson@lenovo.com>,
	"Limonciello, Mario" <Mario.Limonciello@dell.com>,
	Darren Hart <dvhart@infradead.org>,
	Andy Shevchenko <andy@infradead.org>,
	Mark Gross <mgross@linux.intel.com>,
	Elia Devito <eliadevito@gmail.com>,
	Benjamin Berg <bberg@redhat.com>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"platform-driver-x86@vger.kernel.org" 
	<platform-driver-x86@vger.kernel.org>
Subject: Re: [RFC] Documentation: Add documentation for new performance_profile sysfs class (Also Re: [PATCH 0/4] powercap/dtpm: Add the DTPM framework)
Date: Sun, 18 Oct 2020 11:41:45 +0200	[thread overview]
Message-ID: <25d000cc-0c00-3b17-50f7-ca8de8b7a65b@redhat.com> (raw)
In-Reply-To: <CAJZ5v0j8o5Ot-4U0HmUtckUUBSNqC+TRB6CCRzqdjeE0p_XfvA@mail.gmail.com>

Hi,

On 10/16/20 4:51 PM, Rafael J. Wysocki wrote:
> On Fri, Oct 16, 2020 at 1:11 PM Hans de Goede <hdegoede@redhat.com> wrote:
>>
>> <note folding the 2 threads we are having on this into one, adding every one from both threads to the Cc>
>>
>> Hi,
>>
>> On 10/14/20 5:42 PM, Rafael J. Wysocki wrote:
>>> On Wed, Oct 14, 2020 at 4:06 PM Hans de Goede <hdegoede@redhat.com> wrote:
>>>> On 10/14/20 3:33 PM, Rafael J. Wysocki wrote:
>>
>> <snip>
>>
>>>>> First, a common place to register a DPTF system profile seems to be
>>>>> needed and, as I said above, I wouldn't expect more than one such
>>>>> thing to be present in the system at any given time, so it may be
>>>>> registered along with the list of supported profiles and user space
>>>>> will have to understand what they mean.
>>>>
>>>> Mostly Ack, I would still like to have an enum for DPTF system
>>>> profiles in the kernel and have a single piece of code map that
>>>> enum to profile names. This enum can then be extended as
>>>> necessary, but I want to avoid having one driver use
>>>> "Performance" and the other "performance" or one using
>>>> "performance-balanced" and the other "balanced-performance", etc.
>>>>
>>>> With the goal being that new drivers use existing values from
>>>> the enum as much as possible, but we extend it where necessary.
>>>
>>> IOW, just a table of known profile names with specific indices assigned to them.
>>
>> Yes.
>>
>>> This sounds reasonable.
>>>
>>>>> Second, irrespective of the above, it may be useful to have a
>>>>> consistent way to pass performance-vs-power preference information
>>>>> from user space to different parts of the kernel so as to allow them
>>>>> to adjust their operation and this could be done with a system-wide
>>>>> power profile attribute IMO.
>>>>
>>>> I agree, which is why I tried to tackle both things in one go,
>>>> but as you said doing both in 1 API is probably not the best idea.
>>>> So I believe we should park this second issue for now and revisit it
>>>> when we find a need for it.
>>>
>>> Agreed.
>>>
>>>> Do you have any specific userspace API in mind for the
>>>> DPTF system profile selection?
>>>
>>> Not really.
>>
>> So before /sys/power/profile was mentioned, but that seems more like
>> a thing which should have a set of fixed possible values, iow that is
>> out of scope for this discussion.
> 
> Yes.
> 
>> Since we all seem to agree that this is something which we need
>> specifically for DPTF profiles maybe just add:
>>
>> /sys/power/dptf_current_profile    (rw)
>> /sys/power/dptf_available_profiles (ro)
>>
>> (which will only be visible if a dptf-profile handler
>>  has been registered) ?
>>
>> Or more generic and thus better (in case other platforms
>> later need something similar) I think, mirror the:
>>
>> /sys/bus/cpu/devices/cpu#/cpufreq/energy_performance_* bits
>> for a system-wide energy-performance setting, so we get:
>>
>> /sys/power/energy_performance_preference
>> /sys/power/energy_performance_available_preferences
> 
> But this is not about energy vs performance only in general, is it?
> 
>> (again only visible when applicable) ?
>>
>> I personally like the second option best.
> 
> But I would put it under /sys/firmware/ instead of /sys/power/ and I
> would call it something like platform_profile (and
> platform_profile_choices or similar).

Currently we only have dirs under /sys/firmware:

[hans@x1 ~]$ ls /sys/firmware
acpi  dmi  efi  memmap

But we do have /sys/firmware/apci/pm_profile:

Documentation/ABI/stable/sysfs-acpi-pmprofile

What:           /sys/firmware/acpi/pm_profile
Date:           03-Nov-2011
KernelVersion:  v3.2
Contact:        linux-acpi@vger.kernel.org
Description:    The ACPI pm_profile sysfs interface exports the platform
                power management (and performance) requirement expectations
                as provided by BIOS. The integer value is directly passed as
                retrieved from the FADT ACPI table.
Values:         For possible values see ACPI specification:
                5.2.9 Fixed ACPI Description Table (FADT)
                Field: Preferred_PM_Profile

                Currently these values are defined by spec:
                0 Unspecified
                1 Desktop
                2 Mobile
                3 Workstation
                4 Enterprise Server
		...

Since all platforms which we need this for are ACPI based
(and the involved interfaces are also all ACPI interfaces)
how about:

/sys/firmware/acpi/platform_profile
/sys/firmware/acpi/platform_profile_choices

?

I think this goes nice together with /sys/firmware/acpi/pm_profile
although that is read-only and this is a read/write setting.

Rafel, would:

/sys/firmware/acpi/platform_profile
/sys/firmware/acpi/platform_profile_choices

work for you ?

Regards,

Hans



  reply	other threads:[~2020-10-18  9:41 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-06 12:20 [PATCH 0/4] powercap/dtpm: Add the DTPM framework Daniel Lezcano
2020-10-06 12:20 ` [PATCH 1/4] units: Add Watt units Daniel Lezcano
2020-11-10 10:02   ` Lukasz Luba
2020-10-06 12:20 ` [PATCH 2/4] Documentation/powercap/dtpm: Add documentation for dtpm Daniel Lezcano
2020-10-13 22:01   ` Ram Chandrasekar
2020-10-06 12:20 ` [PATCH 3/4] powercap/drivers/dtpm: Add API for dynamic thermal power management Daniel Lezcano
2020-10-06 16:42   ` kernel test robot
2020-10-06 18:05   ` kernel test robot
2020-10-23 10:29   ` Lukasz Luba
2020-11-03 18:42     ` Daniel Lezcano
2020-11-10  9:59   ` Lukasz Luba
2020-11-10 11:05     ` Lukasz Luba
2020-11-10 14:59       ` Daniel Lezcano
2020-11-10 15:04         ` Lukasz Luba
2020-11-10 12:55     ` Daniel Lezcano
2020-10-06 12:20 ` [PATCH 4/4] powercap/drivers/dtpm: Add CPU energy model based support Daniel Lezcano
2020-10-23 13:27   ` Lukasz Luba
2020-11-04 10:47     ` Daniel Lezcano
2020-11-04 10:57       ` Lukasz Luba
2020-11-04 11:15         ` Daniel Lezcano
2020-11-10 12:50   ` Lukasz Luba
2020-10-07 10:43 ` [PATCH 0/4] powercap/dtpm: Add the DTPM framework Hans de Goede
2020-10-12 10:30   ` Daniel Lezcano
2020-10-12 11:46     ` Hans de Goede
2020-10-12 16:02       ` Daniel Lezcano
2020-10-13 12:47         ` Hans de Goede
2020-10-12 16:37       ` Rafael J. Wysocki
2020-10-13 13:04         ` Hans de Goede
2020-10-14 13:33           ` Rafael J. Wysocki
2020-10-14 14:06             ` Hans de Goede
2020-10-14 15:42               ` Rafael J. Wysocki
2020-10-16 11:10                 ` [RFC] Documentation: Add documentation for new performance_profile sysfs class (Also Re: [PATCH 0/4] powercap/dtpm: Add the DTPM framework) Hans de Goede
2020-10-16 14:26                   ` Elia Devito
     [not found]                     ` <HK2PR0302MB2449214B28438ADC1790D468BD030@HK2PR0302MB2449.apcprd03.prod.outlook.com>
2020-10-16 14:43                       ` Fw: [External] " Mark Pearson
2020-10-16 15:16                         ` Elia Devito
2020-10-16 14:51                   ` Rafael J. Wysocki
2020-10-18  9:41                     ` Hans de Goede [this message]
2020-10-18 12:31                       ` Rafael J. Wysocki
2020-10-19 18:43                         ` Hans de Goede
     [not found]                           ` <HK2PR0302MB24494037019FBC7720976735BD1E0@HK2PR0302MB2449.apcprd03.prod.outlook.com>
2020-10-19 18:49                             ` Fw: [External] " Mark Pearson
2020-10-25 10:13                               ` Hans de Goede
2020-10-20 12:34                           ` Rafael J. Wysocki

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