New thermal trip types
summary
Proposes a new user trip point writable by userspace that only triggers a notification (no kernel mitigation) and requires sensors with programmable interrupt thresholds; drivers must avoid creating these if hardware lacks interrupt programming. Adds a debugfs view recording mitigation episode stats (timestamped durations, min/max/avg/stddev temps, cooling states) for postmortem tuning. Suggests a slope-based prediction for the stepwise governor to set timers by estimated crossing time (milliseconds resolution); idea is untested and hardware interrupt count/programmability creates conflicts.
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