Andreas Kling abdd5aa08a Kernel: Separate runnable thread queues by priority ...

This patch introduces three separate thread queues, one for each thread
priority available to userspace (Low, Normal and High.)

Each queue operates in a round-robin fashion, but we now always prefer
to schedule the highest priority thread that currently wants to run.

There are tons of tweaks and improvements that we can and should make
to this mechanism, but I think this is a step in the right direction.

This makes WindowServer significantly more responsive while one of its
clients is burning CPU. :^)

2019-12-27 00:52:30 +01:00

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