linux-kernel - Re: [PATCH v4] sched: Provide USF for the portable equipment.

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Date:   Tue, 4 Aug 2020 08:41:27 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dongdong Yang <contribute.kernel@...il.com>,
        gregkh@...uxfoundation.org, rjw@...ysocki.net,
        viresh.kumar@...aro.org, mingo@...hat.com, peterz@...radead.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de
Cc:     linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-pm@...r.kernel.org, yangdongdong@...omi.com,
        yanziily@...omi.com, rocking@...ux.alibaba.com
Subject: Re: [PATCH v4] sched: Provide USF for the portable equipment.

On 8/4/20 12:50 AM, Dongdong Yang wrote:
> From: Dongdong Yang <yangdongdong@...omi.com>
> 
> ---
> 
> diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
> index b555df8..e299418 100644
> --- a/Documentation/ABI/testing/sysfs-devices-system-cpu
> +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
> @@ -614,3 +614,51 @@ Description:	SPURR ticks for cpuX when it was idle.
>  
>  		This sysfs interface exposes the number of SPURR ticks
>  		for cpuX when it was idle.
> +
> +What:		/sys/devices/system/cpu/sched_usf
> +		/sys/devices/system/cpu/sched_usf/sched_usf_non_ux_r
> +		/sys/devices/system/cpu/sched_usf/sched_usf_up_l0_r
> +		/sys/devices/system/cpu/sched_usf/sched_usf_down_r
> +Date:		Aug 2020
> +Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
> +Description:	User Sensitive Feedback factor auxiliary scheduling which
> +		is providing more utils adjustment settings to the high level
> +		by scenario identification.

what is "utils"?

> +		sched_usf_non_ux_r:
> +			The ratio of utils is cut down on screen off. The

same question.

> +			default value is 0, which no util is adjusted on sugov

what is "sugov"?

> +			calculating utils to select cpufreq. Its range is
> +			[-100 , 0]. If its value falls into [-50, 0), the half
> +			of utils, which	calculates cpufreq, shall be  cut down.
> +			If its value falls into [-100, -50), only a quarter of
> +			utils are left to continue to calculate cpufreq.
> +			It is expected to be set [-100, 0) once enter into the
> +			identificated scenario, such as listen to music on

			^^^^^^^^^^^^^ not a word.


> +			screen off, and recover to 0 on out of the scenario,
> +			such as	screen on.
> +
> +		sched_usf_up_l0_r:
> +			The ratio of utils is boost up on screen on. The
> +			default value is 0, which no util is adjusted on sugov
> +			calculates utils to select cpufreq. Its range is [0 , 100].
> +			If its value falls into (0, 50], a quarter of extra utils,
> +			which calculate cpufreq, shall be added. If its value
> +			falls into (50, 100], the half of extra utils are added
> +			to continue to	calculate cpufreq.
> +			It is expected to be set (0, 100] once enter into the
> +			identificated scenario, such as browsing videolet on

what is "videolet"?

> +			screen on, and recover to 0 on out of the scenario,
> +			such as screen off or videolet into background.
> +
> +		sched_usf_down_r:
> +			The ratio of utils is cut down on screen on. The
> +			default	value is 0, which no util is adjusted on sugov
> +			calculating utils to select cpufreq. Its range is
> +			[-100 , 0]. If its value falls into [-50, 0), the half
> +			of utils, which	calculate cpufreq, shall be  cut down.
> +			If its value falls into [-100, -50), only a quarter of
> +			utils are left to continue to calculate cpufreq.
> +			It is expected to be set [-100, 0) once enter into the
> +			identificated scenario, such as browsing videolet on
> +			screen on, and recover to 0 on	out of the scenario,
> +			such as screen off or vidolet into background.


-- 
~Randy