Thread wakeup: replace serial wakeup with tree wakeup #57649
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This is still WIP.
Every time a task is scheduled (and in numerous other situations), we would like to ensure that at least one thread is awake to run the task. Currently, we wake all threads, via a serial loop in
wakeup_thread(). This scales poorly and is inefficient. #56475 reworks this with a "spinner" thread approach. This PR tries a different approach: continue to wake up all threads, but via a tree wakeup rather than serially.