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Date: Wed, 5 Aug 2020 14:21:46 +0300
From: Dan Carpenter <dan.carpenter@...cle.com>
To: Dongdong Yang <contribute.kernel@...il.com>
Cc: 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, devel@...verdev.osuosl.org,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
yangdongdong@...omi.com, yanziily@...omi.com,
rocking@...ux.alibaba.com
Subject: Re: [PATCH v5] sched: Provide USF for the portable equipment.
On Wed, Aug 05, 2020 at 03:36:21PM +0800, Dongdong Yang wrote:
> From: Dongdong Yang <yangdongdong@...omi.com>
>
> The power consumption and UI response are more cared for by the portable
> equipment users. USF(User Sensitive Feedback factor) auxiliary cpufreq
> governor is providing more util adjustment settings to the high level
> by scenario identification.
>
> From the view of portable equipment, screen off status usually 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. In
> some scenarios, such as listening to music, low power processors, such
> as DSP, take more actions and CPU load requirements cut down. It would
> bring more power consumption benefit if high level have interfaces to
> adjust utils according to the current scenario and load.
>
> In addition, the portable equipment user usually heavily interact with
> devices by touch, and other peripherals. The boost preemptive counts
> are marking the load requirement urgent, vice versa. If such feedback
> factor could be set to high level according to the scenario, it would
> contribute to the power consumption and UI response.
>
> If no USF sysfs inode is set, and no screen on or off event,
> adjust_pred_demand shall not be invoked. Once up_l0_r down_r or non_ux_r
> be set, adjust_pred_demand shall be called back to update settings
> according to high level scenario identification.
>
> We can get about 17% mean power consumption save at listening to music
> with speaker on "screen off" scenario, as below statistical data from
> 7766 XiaoMi devices for two weeks with non_ux_r be set:
>
> day1 day2 day3 day4
> count 7766.000000 7766.000000 7766.000000 7766.000000
> mean 88.035525 85.500282 83.829305 86.054997
> std 111.049980 108.258834 107.562583 108.558240
> min 0.099000 0.037000 0.067000 0.045000
> 25% 34.765500 34.021750 34.101500 34.423000
> 50% 54.950000 55.286500 54.189500 54.248500
> 75% 95.954000 93.942000 91.738000 94.0592500
> 80% 114.675000 107.430000 106.378000 108.673000
> 85% 137.851000 129.511000 127.156500 131.750750
> 90% 179.669000 170.208500 164.027000 172.348000
> 95% 272.395000 257.845500 247.750500 263.275750
> 98% 399.034500 412.170400 391.484000 402.835600
>
> day5 day6 day7 day8
> count 7766.000000 7766.00000 7766.000000 7766.000000
> mean 82.532677 79.21923 77.611380 81.075081
> std 104.870079 101.34819 103.140037 97.506221
> min 0.051000 0.02900 0.007000 0.068000
> 25% 32.873000 33.44400 31.965500 33.863500
> 50% 52.180500 51.56550 50.806500 53.080000
> 75% 90.905750 86.82625 83.859250 89.973000
> 80% 105.455000 99.64700 97.271000 104.225000
> 85% 128.300000 118.47825 116.570250 126.648250
> 90% 166.647500 149.18000 150.649500 161.087000
> 95% 247.208500 224.36050 226.380000 245.291250
> 98% 393.002000 347.92060 369.791800 378.778600
>
> day9 day10 day11 day12
> count 7766.000000 7766.000000 7766.000000 7766.000000
> mean 79.989170 83.859417 78.032930 77.060542
> std 104.226122 108.893043 102.561715 99.844276
> min 0.118000 0.017000 0.028000 0.039000
> 25% 32.056250 33.454500 31.176250 30.897750
> 50% 51.506000 54.056000 48.969500 49.069000
> 75% 88.513500 92.953500 83.506750 84.096000
> 80% 102.876000 107.845000 97.717000 98.073000
> 85% 124.363000 128.288000 118.366500 116.869250
> 90% 160.557000 167.084000 154.342500 148.187500
> 95% 231.149000 242.925750 236.759000 228.131250
> 98% 367.206600 388.619100 385.269100 376.541600
>
> day13 day14
> count 7766.000000 7766.000000
> mean 75.528036 73.702878
> std 90.750594 86.796016
> min 0.066000 0.054000
> 25% 31.170500 31.608500
> 50% 48.758500 49.215000
> 75% 84.522750 83.053000
> 80% 97.879000 94.875000
> 85% 116.680250 113.573750
> 90% 149.083500 144.089500
> 95% 226.177750 211.488750
> 98% 347.011100 331.317100
>
> Signed-off-by: Dongdong Yang <yangdongdong@...omi.com>
> Co-developed-by: Jun Tao <taojun@...omi.com>
> Co-developed-by: Qiwu Huang <huangqiwu@...omi.com>
> Co-developed-by: Peng Wang <rocking@...ux.alibaba.com>
> Signed-off-by: Dongdong Yang <yangdongdong@...omi.com>
> ---
> Documentation/ABI/testing/sysfs-devices-system-cpu | 31 ++
> drivers/cpufreq/Kconfig | 11 +
> kernel/sched/Makefile | 1 +
> kernel/sched/cpufreq_schedutil.c | 5 +
> kernel/sched/usf.c | 314 +++++++++++++++++++++
> 5 files changed, 362 insertions(+)
> create mode 100644 kernel/sched/usf.c
>
> diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
> index b555df8..e9a4cfd 100644
> --- a/Documentation/ABI/testing/sysfs-devices-system-cpu
> +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
> @@ -614,3 +614,34 @@ 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/non_ux_r
> + /sys/devices/system/cpu/sched_usf/up_l0_r
> + /sys/devices/system/cpu/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 util adjustment settings based on schedutil
> + governor to the high level by scenario identification on
> + portable equipment.
> + non_ux_r:
> + The default value is 0. The range is [-100 , 0].
> + If it falls into [-50, 0), the half of utils, which
> + calculates cpufreq, shall be cut down on screen off.
> + If it falls into [-100, -50), only a quarter of utils
> + are left to continue to calculate cpufreq on screen off.
> +
> + up_l0_r:
> + The default value is 0. The range is [0 , 100].
> + If it falls into (0, 50], a quarter of extra utils,
> + which calculate cpufreq, shall be added on screen on.
> + If it falls into (50, 100], the half of extra utils are
> + added to continue to calculate cpufreq on screen on.
> +
> + down_r:
> + The default value is 0. The range is [-100 , 0].
> + If it falls into [-50, 0), the half of utils, which
> + calculate cpufreq, shall be cut down on screen on.
> + If it falls into [-100, -50), only a quarter of utils
> + are left to continue to calculate cpufreq on screen on.
> diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> index e917501..a21c6ad 100644
> --- a/drivers/cpufreq/Kconfig
> +++ b/drivers/cpufreq/Kconfig
> @@ -224,6 +224,17 @@ config CPUFREQ_DT_PLATDEV
>
> If in doubt, say N.
>
> +config SCHED_USF
> + bool "User Sensitive Factors for Scheduler"
> + depends on CPU_FREQ_GOV_SCHEDUTIL && FB
> + help
> + Select this option to enable the adjustment on the cpufreq with
> + the user sensitive factors on schedule. It is special for mobile
> + devices which more power care and quick response requirement on
> + screen on.
> +
> + If unsure, say N.
> +
> if X86
> source "drivers/cpufreq/Kconfig.x86"
> endif
> diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile
> index 5fc9c9b..58a0e7b 100644
> --- a/kernel/sched/Makefile
> +++ b/kernel/sched/Makefile
> @@ -36,3 +36,4 @@ obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o
> obj-$(CONFIG_MEMBARRIER) += membarrier.o
> obj-$(CONFIG_CPU_ISOLATION) += isolation.o
> obj-$(CONFIG_PSI) += psi.o
> +obj-$(CONFIG_SCHED_USF) += usf.o
> diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
> index 7fbaee2..6f9cb6c 100644
> --- a/kernel/sched/cpufreq_schedutil.c
> +++ b/kernel/sched/cpufreq_schedutil.c
> @@ -289,12 +289,17 @@ unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs,
> return min(max, util);
> }
>
> +void (*adjust_pred_demand_p)(int cpuid, unsigned long *util,
> + struct rq *rq) = NULL;
Remove the _p. We all know this is a pointer already without the
Hungarian notation.
> +
> static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu)
> {
> struct rq *rq = cpu_rq(sg_cpu->cpu);
> unsigned long util = cpu_util_cfs(rq);
> unsigned long max = arch_scale_cpu_capacity(sg_cpu->cpu);
>
> + if (unlikely(adjust_pred_demand_p))
> + adjust_pred_demand_p(sg_cpu->cpu, &util, rq);
> sg_cpu->max = max;
> sg_cpu->bw_dl = cpu_bw_dl(rq);
>
> diff --git a/kernel/sched/usf.c b/kernel/sched/usf.c
> new file mode 100644
> index 0000000..f3183f1
> --- /dev/null
> +++ b/kernel/sched/usf.c
> @@ -0,0 +1,314 @@
> +/*
> + * Copyright (C) 2020 XiaoMi Inc.
> + * Author: Yang Dongdong <yangdongdong@...omi.com>
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> + * See http://www.gnu.org/licenses/gpl-2.0.html for more details.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/platform_device.h>
> +#include <linux/kthread.h>
> +#include <linux/cpu.h>
> +#include <linux/sysfs.h>
> +#include <linux/kthread.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/kallsyms.h>
> +#include <linux/fb.h>
> +#include <linux/notifier.h>
> +#include "sched.h"
> +
> +#define BOOST_MIN_V -100
> +#define BOOST_MAX_V 100
> +#define LEVEL_TOP 3
> +
> +extern void (*adjust_pred_demand_p)(int cpuid,
> + unsigned long *util, struct rq *rq);
> +DEFINE_PER_CPU(unsigned long[PID_MAX_DEFAULT], task_hist_nivcsw);
> +
> +static struct {
> + bool is_enabled;
> + bool is_screen_on;
> + int sysctl_up_l0;
> + int sysctl_down;
> + int sysctl_non_ux;
I don't understand the point of sysctl_up_l0, sysctl_down and
sysctl_non_ux. They are a value from BOOST_MIN_V-BOOST_MAX_V but we
only check them against zero/non-zero. Am I missing something?
> + int usf_up_l0;
> + int usf_down;
> + int usf_non_ux;
> +} usf_vdev;
> +
> +void adjust_pred_demand(int cpuid,
> + unsigned long *util,
> + struct rq *rq)
> +{
> + /*
> + * The initial value of bl_sw_num is the ratio of
> + * sysctl_sched_latency/sysctl_sched_min_granularity.
> + * It stands for the basic acceptable fluency.
> + */
> + u32 bl_sw_num = 3;
> +
> + if (!usf_vdev.is_enabled || !rq || !rq->curr ||
> + (rq->curr->pid >= PID_MAX_DEFAULT))
> + return;
Please indent like this:
if (!usf_vdev.is_enabled || !rq || !rq->curr ||
(rq->curr->pid >= PID_MAX_DEFAULT))
return;
> + /*
> + * usf_non_ux:
> + * It comes from non_ux_r, which is the ratio of utils
> + * cut down on screen off. There are 3 levels. The default
> + * value is 0, which no util is adjusted on calculating
> + * utils to select cpufreq. If non_ux_r falls into [-50, 0),
> + * usf_non_ux equals 1, and a half of utils, which calculates
> + * cpufreq, shall be cut down. If non_ux_r falls into
> + * [-100, -50), usf_non_ux equals to 2, only a quarter of
> + * utils are left to continue to calculate cpufreq.
> + *
> + * usf_up_l0:
> + * It comes from sysfs up_l0, which is the ratio of utils
> + * boost up on screen on. There are 3 levels. The default
> + * value is 0, which no util is adjusted when cpufreq be
> + * calculated according it. If up_l0 falls into (0, 50],
> + * usf_up_l0 equals to 2. And a quarter of extra utils,
> + * which calculate cpufreq, shall be added. If up_l0 falls
> + * into (50, 100], usf_up_l0 equals to 1. And the half of
> + * extra utils are added to continue to calculate cpufreq.
> + *
> + * usf_down:
> + * It comes from down_r, which is the ratio of utils cut
> + * down on screen on. There are 3 levels. The default value
> + * is 0, which no util is adjusted on calculating utils to
> + * select cpufreq. If down_r falls into [-50, 0), usf_down
> + * equals to 1, and a half of utils, which calculate cpufreq
> + * shall be cut down. If down_r falls into [-100, -50)
> + * usf_down equals to 2, and only a quarter of utils are
> + * left to continue to calculate cpufreq.
> + */
> + if (usf_vdev.is_screen_on) {
> + if (rq->curr->nivcsw >
> + (per_cpu(task_hist_nivcsw, cpuid)[rq->curr->pid]
> + + bl_sw_num + 1)) {
Put the + on the first line:
if (rq->curr->nivcsw >
(per_cpu(task_hist_nivcsw, cpuid)[rq->curr->pid] +
bl_sw_num + 1)) {
> + (*util) += (*util) >> usf_vdev.usf_up_l0;
> + } else if (rq->curr->nivcsw <
> + (per_cpu(task_hist_nivcsw, cpuid)[rq->curr->pid]
> + + bl_sw_num - 1) && (rq->nr_running < bl_sw_num)) {
Plus on the first line.
> + (*util) >>= usf_vdev.usf_down;
> + }
> + per_cpu(task_hist_nivcsw, cpuid)[rq->curr->pid] =
> + rq->curr->nivcsw;
> + } else if (rq->curr->mm) {
> + (*util) >>= usf_vdev.usf_non_ux;
> + }
> +}
> +
> +static int usf_lcd_notifier(struct notifier_block *nb,
> + unsigned long val, void *data)
> +{
> + struct fb_event *evdata = data;
> + unsigned int blank;
> +
> + if (!evdata)
> + return 0;
Should this be return NOTIFY_DONE?
> +
> + if (val != FB_EVENT_BLANK)
> + return 0;
> +
> + if (evdata->data && val == FB_EVENT_BLANK) {
The FB_EVENT_BLANK check is duplicated from the line before. Remove it
and flip the condition around.
if (!evdata->data)
return NOTIFY_DONE;
Then we can pull everything in one indent level.
> + blank = *(int *)(evdata->data);
> +
> + switch (blank) {
> + case FB_BLANK_POWERDOWN:
> + usf_vdev.is_screen_on = false;
> + if (usf_vdev.sysctl_non_ux != 0)
> + adjust_pred_demand_p = adjust_pred_demand;
> + else
> + adjust_pred_demand_p = NULL;
> +
> + break;
> +
> + case FB_BLANK_UNBLANK:
> + usf_vdev.is_screen_on = true;
> + if (usf_vdev.sysctl_up_l0 != 0 ||
> + usf_vdev.sysctl_down != 0)
> + adjust_pred_demand_p = adjust_pred_demand;
> + else
> + adjust_pred_demand_p = NULL;
> + break;
> + default:
> + break;
> + }
> +
> + usf_vdev.is_enabled = true;
> + pr_info("%s : usf_vdev.is_screen_on:%b\n",
> + __func__, usf_vdev.is_screen_on);
I don't think you want to print this every time the notifier is called.
> + }
> + return NOTIFY_OK;
> +}
> +
> +static struct notifier_block usf_lcd_nb = {
> + .notifier_call = usf_lcd_notifier,
> + .priority = INT_MAX,
> +};
> +
> +static ssize_t up_l0_r_store(struct device *kobj,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + int val = 0;
> + int ret = 0;
Delete both of these unused initializers.
> +
> + ret = kstrtoint(buf, 0, &val);
> + if (ret)
> + return ret;
> +
> + if (val == 0) {
> + usf_vdev.sysctl_up_l0 = val;
> + usf_vdev.usf_up_l0 = 0;
Set ret on this path?
> + } else if ((val > 0) && (val <= BOOST_MAX_V)) {
> + usf_vdev.sysctl_up_l0 = val;
> + usf_vdev.usf_up_l0 = LEVEL_TOP -
> + DIV_ROUND_UP(val, BOOST_MAX_V / 2);
> + ret = count;
> + } else {
> + pr_err("USF BUG: %d should fall into [%d %d]",
> + val, 0, BOOST_MAX_V);
> + ret = -EINVAL;
I really wish this just returned when we passed invalid data instead of
setting adjust_pred_demand_p = NULL;
> + }
> + if ((usf_vdev.sysctl_up_l0 == 0) &&
> + (usf_vdev.sysctl_down == 0))
> + adjust_pred_demand_p = NULL;
> + else
> + adjust_pred_demand_p = adjust_pred_demand;
> +
> + return ret;
> +}
> +
> +static ssize_t down_r_store(struct device *kobj,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + int val = 0;
> + int ret = 0;
Delete initializers.
> +
> + ret = kstrtoint(buf, 0, &val);
> + if (ret)
> + return ret;
> +
> + if ((val >= BOOST_MIN_V) && (val <= 0)) {
> + usf_vdev.sysctl_down = val;
> + usf_vdev.usf_down = DIV_ROUND_UP(-val, -BOOST_MIN_V / 2);
> + ret = count;
> + } else {
> + pr_err("USF BUG: %d should fall into [%d %d]",
> + val, BOOST_MIN_V, 0);
> + ret = -EINVAL;
> + }
> + if ((usf_vdev.sysctl_up_l0 == 0) &&
> + (usf_vdev.sysctl_down == 0))
> + adjust_pred_demand_p = NULL;
> + else
> + adjust_pred_demand_p = adjust_pred_demand;
> +
> + return ret;
> +}
> +
> +static ssize_t non_ux_r_store(struct device *kobj,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + int val = 0;
> + int ret = 0;
Delete initializers.
> +
> + ret = kstrtoint(buf, 0, &val);
> + if (ret)
> + return ret;
> +
> + if ((val >= BOOST_MIN_V) && (val <= 0)) {
> + usf_vdev.sysctl_non_ux = val;
> + usf_vdev.usf_non_ux = DIV_ROUND_UP(-val, -BOOST_MIN_V / 2);
> + ret = count;
> + } else {
> + pr_err("USF BUG: %d should fall into [%d %d]",
> + val, BOOST_MIN_V, 0);
> + ret = -EINVAL;
> + }
> + if (usf_vdev.sysctl_non_ux == 0)
> + adjust_pred_demand_p = NULL;
> + else
> + adjust_pred_demand_p = adjust_pred_demand;
> +
> + return ret;
> +}
> +
> +#define usf_attr_rw(_name) \
> +static struct device_attribute _name = \
> +__ATTR_RW(_name)
> +
> +#define usf_show_node(_name, _value) \
> +static ssize_t _name##_show \
> +(struct device *kobj, struct device_attribute *attr, char *buf) \
> +{ \
> + return sprintf(buf, "%d", usf_vdev.sysctl_##_value); \
> +}
> +
> +usf_show_node(up_l0_r, up_l0);
> +usf_show_node(down_r, down);
> +usf_show_node(non_ux_r, non_ux);
> +
> +usf_attr_rw(up_l0_r);
> +usf_attr_rw(down_r);
> +usf_attr_rw(non_ux_r);
> +
> +static struct attribute *sched_usf_attrs[] = {
> + &up_l0_r.attr,
> + &down_r.attr,
> + &non_ux_r.attr,
> + NULL,
> +};
> +
> +ATTRIBUTE_GROUPS(sched_usf);
> +
> +static int __init intera_monitor_init(void)
> +{
> + int res = -1;
Delete initializer
> + struct device *dev;
Get rid of the dev variable and use cpu_subsys.dev_root directly.
> +
> + res = fb_register_client(&usf_lcd_nb);
> + if (res < 0) {
> + pr_err("Failed to register usf_lcd_nb!\n");
> + return res;
> + }
> +
> + /*
> + * create a sched_usf in cpu_subsys:
> + * /sys/devices/system/cpu/sched_usf/...
> + */
> + dev = cpu_subsys.dev_root;
> + res = sysfs_create_group(&dev->kobj, &sched_usf_group);
> + if (res) {
> + fb_unregister_client(&usf_lcd_nb);
> + return res;
> + }
> +
> + return res;
"return 0;" is more readable than "return res;"
> +}
> +
> +module_init(intera_monitor_init);
> +
> +static void __exit intera_monitor_exit(void)
> +{
> + struct device *dev;
Get rid of the dev variable.
> +
> + dev = cpu_subsys.dev_root;
> + sysfs_remove_group(&dev->kobj, &sched_usf_group);
> + fb_unregister_client(&usf_lcd_nb);
> + adjust_pred_demand_p = NULL;
I'm pretty sure this is not required. Delete this line.
regards,
dan carpenter
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