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Prevent COALESCE(dur, 0) and leading zero-duration rows in _arm_l3_miss_rate and _arm_l3_hit_rate so that there aren't any "instant" slices. Bug: 454944449
…rvals Use counter_leading_intervals() to generate cpuidle slices in C++ and compute boundaries directly, eliminating expensive window functions over raw counters. Pre-map track offsets and resolve deep-idle exit timestamps via a sparse `_deeo_idle_before_exit` index lookup. wattson_dsu_devfreq_system_state improves from ~3700ms --> ~2800ms Bug: 454944449
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Use counter_leading_intervals() to generate cpuidle slices in C++ and
compute boundaries directly, eliminating expensive window functions
over raw counters. Pre-map track offsets and resolve deep-idle exit timestamps
via a sparse
_deeo_idle_before_exitindex lookup.wattson_dsu_devfreq_system_state improves from ~3700ms --> ~2800ms
Test: tools/diff_test_trace_processor.py out/linux_clang_release/trace_processor_shell --name-filter '.wattson_' --print-slowest-tests
Bug: 454944449