Greg Pomerantz 915e04c2c3 120Hz: jank_eval referee + slot-based wake guard + MISS ledger ...

tools/jank_eval.py: strict PASS/FAIL jank evaluator (the referee).
- slot grid from VSYNC ftn edges (hardware truth); anchor fallback only
- PASS iff per active window: no dropped slot, no same-slot double, no
  present past the SF latch, no >20ms present gap, phase spread <=0.5ms
- self-test: 7 synthetic log files through the same main() path, all
  classified correctly; validated on the emulator (60 Hz emu display
  detected, active windows found)
- re-judges slt4 honestly: my 'clean' drag-1 window is FAIL (30.6ms +
  21ms stalls, 20 past-latch presents, 1.1ms spread) — the user saw it

lib.rs/stg.rs: slot-based wake guard replaces the interval freshness
guard (0.2ms false-reject margin). A wake renders iff its edge-grid slot
is strictly after the last rendered slot; a gap of >=2 slots emits
MISS {mon, slots, nowake} — the missing evidence for stall slots
(wakes lost vs loop blocked vs guard).

sltest: log drain batch-flush (64 lines) — per-line FUSE flush stalled
the drain thread for minutes (file frozen, process alive).
gallery: MISS lines added to the perf-log allowlist.

2026-10-30 13:29:50 -04:00

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