Show total CPU usage by all processes, instead of LVGL alone #2
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Will push DDR stuff to this PR too. |
Presently, it *seems* like the demo shows CPU utilization. However, it actually only shows the percentage of the CPU utilized by the demo alone, instead of the total CPU usage by all running processes. This functionality was built for MCU devices, wherein there's usually only a single thread running at a given time, but it fails in application-level processors that run Linux. Therefore implement functions that show full CPU usage. These functions read /proc/stat, and maintain the results of the previous read. They use the values read in the current invocation with those stored by the previous to determine the total CPU usage. Signed-off-by: Suhaas Joshi <[email protected]>
The macro LV_SYSMON_GET_IDLE, defined in /lv_port_linux/lv_conf.h, defines the function responsible for returning CPU usage. Presently, it specifies lv_timer_get_idle() as the function for the job. Therefore edit this function to return ti_get_cpu_load()'s value. This returns the total CPU usage across all cores, instead of returning the usage by the demo alone. See d3a3f97 for details. Signed-off-by: Suhaas Joshi <[email protected]>
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Currently, LVGL calculates only the CPU utilization done by itself. This PR changes this to return the total CPU usage by all processes running on the SoC.