linux-kernel - [PATCH v2] Provide USF for the portable equipment.

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Message-Id: <cover.1596196060.git.yangdongdong@xiaomi.com>
Date:   Fri, 31 Jul 2020 20:46:29 +0800
From:   Dongdong Yang <contribute.kernel@...il.com>
To:     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,
        tanggeliang@...omi.com, taojun@...omi.com, huangqiwu@...omi.com,
        rocking@...ux.alibaba.com, fengwei@...omi.com,
        zhangguoquan@...omi.com, gulinghua@...omi.com, duhui@...omi.com
Subject: [PATCH v2] Provide USF for the portable equipment.

From: Dongdong Yang <yangdongdong@...omi.com>

This patch provides USF(User Sensitive Feedback factor) auxiliary
cpufreq governor to support high level layer sysfs inodes setting
for utils adjustment purpose from the identified scenario on portable
equipment. Because the power consumption and UI response are more cared
for by portable equipment users. And the "screen off" status stands for
no request from the user, however, the kernel is still expected to
notify the user in time on modem, network or powerkey events occur. USF
provides "sched_usf_non_ux_r" sysfs inode to cut down the utils from
user space tasks according to high level scenario. In addition, it
usually hints more cpufreq demand that the preemptive counts of the
tasks on the cpu burst and over the user expecting completed time such
as the ratio sysctl_sched_latency to sysctl_sched_min_granularity on
"screen on" status, which more likely with more UI. The sysfs inodes
"sched_usf_up_l0_r" and "sched_usf_down_r" have been provided to adjust
the utils according to high level identified scenario to alloc the
cpufreq in time.

Changes in v2
  - Add adjust_task_pred_set switch.
  - Move adjust_task_pred_demand declaration into sched.h
  - Update comments.

Dongdong Yang (1):
  sched: Provide USF for the portable equipment.

 drivers/staging/Kconfig          |   2 +
 drivers/staging/Makefile         |   1 +
 drivers/staging/fbsched/Kconfig  |  10 ++
 drivers/staging/fbsched/Makefile |   2 +
 drivers/staging/fbsched/usf.c    | 346 +++++++++++++++++++++++++++++++++++++++
 kernel/sched/cpufreq_schedutil.c |   3 +
 kernel/sched/sched.h             |  10 ++
 7 files changed, 374 insertions(+)
 create mode 100644 drivers/staging/fbsched/Kconfig
 create mode 100644 drivers/staging/fbsched/Makefile
 create mode 100644 drivers/staging/fbsched/usf.c

-- 
2.7.4