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Fix HUD CPU usage: measure /proc/stat load instead of clock-frequency#614

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Xnick417x wants to merge 2 commits into
WinNative-Emu:mainfrom
Xnick417x:cpu-p
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Fix HUD CPU usage: measure /proc/stat load instead of clock-frequency#614
Xnick417x wants to merge 2 commits into
WinNative-Emu:mainfrom
Xnick417x:cpu-p

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Compute CPU% from /proc/stat busy vs idle jiffie deltas (on-screen HUD and Task Manager pane, aggregate and per-core) instead of scaling_cur_freq/max which does not reflect actual utilization. Add Mali GPU load fallbacks (/sys/kernel/gpu/gpu_busy, /proc/mtk_mali/utilization).

… ratio

Compute CPU% from /proc/stat busy vs idle jiffie deltas (on-screen HUD and
Task Manager pane, aggregate and per-core) instead of scaling_cur_freq/max
which does not reflect actual utilization. Add Mali GPU load fallbacks
(/sys/kernel/gpu/gpu_busy, /proc/mtk_mali/utilization).
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