On 31/07/2020 14:46, Dongdong Yang wrote:
> From: Dongdong Yang <yangdongd...@xiaomi.com>
[...]
> + if (unlikely(usf_vdev.enable_debug))
> + trace_printk
> + ("%s: cpu_id=%d non_ux=%d usf_up=%d usf_down=%d util=%lu\n",
> + USF_TAG, cpuid, usf_vdev.usf_non_ux,
> + usf_vdev.usf_up_l0, usf_vdev.usf_down, *util);
trace_printk in code ?
> +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;
> +
> + if (val != FB_EVENT_BLANK)
> + return 0;
> +
> + if (evdata->data && val == FB_EVENT_BLANK) {
> + blank = *(int *)(evdata->data);
> +
> + switch (blank) {
> + case FB_BLANK_POWERDOWN:
> + usf_vdev.is_screen_on = 0;
> + if (usf_vdev.sysctl_sched_usf_non_ux != 0)
> + static_branch_enable(&adjust_task_pred_set);
> + else
> + static_branch_disable(&adjust_task_pred_set);
> +
> + break;
> +
> + case FB_BLANK_UNBLANK:
> + usf_vdev.is_screen_on = 1;
> + if (usf_vdev.sysctl_sched_usf_up_l0 != 0 ||
> + usf_vdev.sysctl_sched_usf_down != 0)
> + static_branch_enable(&adjust_task_pred_set);
> + else
> + static_branch_disable(&adjust_task_pred_set);
> + break;
> + default:
> + break;
> + }
> +
> + usf_vdev.is_sched_usf_enabled = 1;
> + if (usf_vdev.enable_debug)
> + trace_printk("%s : usf_vdev.is_screen_on:%d\n",
> + __func__, usf_vdev.is_screen_on);
> + }
> + return NOTIFY_OK;
> +}
> +
> +static struct notifier_block usf_lcd_nb = {
> + .notifier_call = usf_lcd_notifier,
> + .priority = INT_MAX,
> +};
Looks like those notifications should enable/disable the schedutil
extension adjust_task_pred_demand(). Who's calling them?
The 3 sched_usf_FOO sys files somehow have an influence here too. How
should this work?
I see a fb_register_client() in intera_monitor_init further below.
[...]
> +usf_attr_rw(sched_usf_up_l0_r);
> +usf_attr_rw(sched_usf_down_r);
> +usf_attr_rw(sched_usf_non_ux_r);
What can I do with these three files? What do they stand for?
root@h620:/sys/devices/system/cpu/sched_usf# ls
sched_usf_down_r sched_usf_non_ux_r sched_usf_up_l0_r
[...]
> +static int __init intera_monitor_init(void)
> +{
> + int res = -1;
> + struct attribute_group *attr_group;
> +
> + res = fb_register_client(&usf_lcd_nb);
> + if (res < 0) {
> + pr_err("Failed to register usf_lcd_nb!\n");
> + return res;
[...]
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