deecda7336
Patch 1: Policy Hot Cache
- Add TinyPolicyHot struct (route_kind[8] cached in TLS)
- Eliminate policy_snapshot() calls (~2 memory ops saved)
- Safety: disabled when learner v7 active
- Files: tiny_metadata_cache_env_box.h, tiny_metadata_cache_hot_box.{h,c}
- Integration: malloc_tiny_fast.h route selection
Patch 2: First Page Inline Cache
- Cache current slab page pointer in TLS per-class
- Avoid superslab metadata lookup (1-2 memory ops)
- Fast-path in tiny_legacy_fallback_free_base()
- Files: tiny_first_page_cache.h, tiny_unified_cache.c
- Integration: tiny_legacy_fallback_box.h
Patch 3: Bounds Check Compile-out
- Hardcode unified_cache capacity as MACRO constant
- Eliminate modulo operation (constant fold)
- Macros: TINY_UNIFIED_CACHE_CAPACITY_POW2=11, CAPACITY=2048, MASK=2047
- File: tiny_unified_cache.h
A/B Test Results (Mixed, 10-run):
- Baseline (C2=0): 40.43M ops/s (avg), 40.72M ops/s (median)
- Optimized (C2=1): 40.25M ops/s (avg), 40.29M ops/s (median)
- Improvement: -0.45% (avg), -1.06% (median)
- DECISION: NEUTRAL (within ±1.0% threshold)
- Action: Keep as research box (ENV gate OFF by default)
Cumulative Gain (Phase 2-3):
- B3 (Routing shape): +2.89%
- B4 (Wrapper split): +1.47%
- C3 (Static routing): +2.20%
- C2 (Metadata cache): -0.45%
- Total: ~6.1% (from baseline 37.5M → 39.8M ops/s)
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
#ifndef HAKMEM_TINY_LEGACY_FALLBACK_BOX_H
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#define HAKMEM_TINY_LEGACY_FALLBACK_BOX_H
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#include <stdbool.h>
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#include <stdint.h>
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#include "../front/tiny_unified_cache.h"
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#include "../front/tiny_first_page_cache.h" // Phase 3 C2: First page inline cache
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#include "../hakmem.h"
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#include "tiny_front_v3_env_box.h"
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#include "free_path_stats_box.h"
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#include "tiny_front_hot_box.h"
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#include "tiny_metadata_cache_env_box.h" // Phase 3 C2: Metadata cache ENV gate
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// Purpose: Encapsulate legacy free logic (shared by multiple paths)
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// Called by: malloc_tiny_fast.h (free path) + tiny_c6_ultra_free_box.c (C6 fallback)
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//
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// Contract:
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// - base: BASE pointer (already extracted via ptr - 1)
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// - class_idx: size class (0-7)
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// - Returns: void (always succeeds or falls back to tiny_hot_free_fast)
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//
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__attribute__((always_inline))
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static inline void tiny_legacy_fallback_free_base(void* base, uint32_t class_idx) {
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const TinyFrontV3Snapshot* front_snap =
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__builtin_expect(tiny_front_v3_enabled(), 0) ? tiny_front_v3_snapshot_get() : NULL;
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// Phase 3 C2 Patch 2: First page cache hint (optional fast-path)
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// Check if pointer is in cached page (avoids metadata lookup in future optimizations)
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if (__builtin_expect(tiny_metadata_cache_enabled(), 0)) {
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// Note: This is a hint-only check. Even if it hits, we still use the standard path.
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// The cache will be populated during refill operations for future use.
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// Currently this just validates the cache state; actual optimization TBD.
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if (tiny_first_page_cache_hit(class_idx, base, 4096)) {
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// Future: could optimize metadata access here
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}
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}
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// Legacy fallback - Unified Cache push
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if (!front_snap || front_snap->unified_cache_on) {
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if (unified_cache_push(class_idx, HAK_BASE_FROM_RAW(base))) {
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FREE_PATH_STAT_INC(legacy_fallback);
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// Per-class breakdown (Phase 4-1)
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if (__builtin_expect(free_path_stats_enabled(), 0)) {
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if (class_idx < 8) {
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g_free_path_stats.legacy_by_class[class_idx]++;
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}
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}
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return;
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}
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}
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// Final fallback
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tiny_hot_free_fast(class_idx, base);
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}
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#endif // HAKMEM_TINY_LEGACY_FALLBACK_BOX_H
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