Originally posted by ms178
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This does tweak the CFS to make it low latency, but it's also assigning nice values to userspace processes based on either a defined default or input from the window manager instructing it about which process in the system the user is actively interacting with. If you're interacting with a web browser, the web browser and its descendants would get high priority; whereas the Zoom, Discord, and Steam processes in the background would get a low priority. The kernel doesn't have that info, but the window manager does.
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