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    SubjectRe: [PATCH v4] sched: Provide USF for the portable equipment.
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    On 8/4/20 12:50 AM, Dongdong Yang wrote:
    > From: Dongdong Yang <yangdongdong@xiaomi.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@vger.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

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