fb88725a43
Implement C4 ULTRA free TLS cache with parasitic free+alloc pattern, achieving 99.7-99.9% elimination of C4 legacy fallback calls. Key Features: - TLS cache cap=64 (tuned for L1 cache fit, smaller than C5/C6's 128) - Segment learning via ss_fast_lookup() on first free - Free-side cache push + alloc-side TLS pop pattern - ENV gate: HAKMEM_TINY_C4_ULTRA_FREE_ENABLED (default OFF) - Full FREE_PATH_STATS instrumentation Benchmark Results: C4-heavy (65-128B range): - C4 legacy: 591,583 → 1,711 (-99.7%) - c4_ultra cache hits: ~599k (free) + ~599k (alloc) - Mixed load: 340,732 → 284 C4 legacy (-99.9%) Legacy fallback reduction: - C4-heavy: 589,872 fewer legacy calls (-10.9% total) - Mixed: 340,448 fewer C4 legacy calls (-12.8% in mixed) Performance note: ~2% throughput cost in isolated C4-heavy case, acceptable tradeoff for 99%+ legacy elimination per class. Files: NEW: core/box/tiny_c4_ultra_free_box.h/c NEW: core/box/tiny_c4_ultra_free_env_box.h MOD: core/box/tiny_ultra_classes_box.h (added C4 macros) MOD: core/box/free_path_stats_box.h/c (C4 ULTRA counters) MOD: core/front/malloc_tiny_fast.h (C4 alloc+free integration) MOD: Makefile (added C4 ULTRA object) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
18 lines
689 B
C
18 lines
689 B
C
#ifndef HAKMEM_TINY_ULTRA_CLASSES_BOX_H
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#define HAKMEM_TINY_ULTRA_CLASSES_BOX_H
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// Purpose: Named constants for ULTRA tier classes (C4, C5, C6, C7)
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#define TINY_CLASS_C4 4
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#define TINY_CLASS_C5 5
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#define TINY_CLASS_C6 6
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#define TINY_CLASS_C7 7
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// Helper macros for class checking
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#define tiny_class_is_c4(idx) ((idx) == TINY_CLASS_C4)
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#define tiny_class_is_c5(idx) ((idx) == TINY_CLASS_C5)
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#define tiny_class_is_c6(idx) ((idx) == TINY_CLASS_C6)
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#define tiny_class_is_c7(idx) ((idx) == TINY_CLASS_C7)
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#define tiny_class_is_ultra(idx) (tiny_class_is_c4(idx) || tiny_class_is_c5(idx) || tiny_class_is_c6(idx) || tiny_class_is_c7(idx))
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#endif // HAKMEM_TINY_ULTRA_CLASSES_BOX_H
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