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gh-146073: Add fitness/exit quality mechanism for JIT trace frontend (GH-148089)

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* Replaces ad-hoc logic for ending traces with a simple inequality: `fitness < exit_quality`
* Fitness starts high and is reduced for branches, backward edges, calls and trace length
* Exit quality reflect how good a spot that instruction is to end a trace. Closing a loop is very, specializable instructions are very low and the others in between.
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Hai Zhu 2026-04-24 17:37:01 +08:00 • committed by GitHub
parent 448d7b96c1
commit 618b726d68
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10 changed files with 205 additions and 45 deletions
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Python/pystats.c
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@ -274,6 +274,7 @@ print_optimization_stats(FILE *out, OptimizationStats *stats)
fprintf(out, "Optimization low confidence: %" PRIu64 "\n", stats->low_confidence);
fprintf(out, "Optimization unknown callee: %" PRIu64 "\n", stats->unknown_callee);
fprintf(out, "Executors invalidated: %" PRIu64 "\n", stats->executors_invalidated);
fprintf(out, "Optimization fitness terminated: %" PRIu64 "\n", stats->fitness_terminated_traces);
print_histogram(out, "Trace length", stats->trace_length_hist);
print_histogram(out, "Trace run length", stats->trace_run_length_hist);