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>
59 lines
3.1 KiB
C
59 lines
3.1 KiB
C
// tiny_env_box.h - Centralized Tiny env cache (hot-path safe)
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#pragma once
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#include <stdatomic.h>
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typedef struct {
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int inited;
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int tiny_tls_sll; // HAKMEM_TINY_TLS_SLL (default: 1)
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int sll_multiplier; // HAKMEM_SLL_MULTIPLIER (default: 2)
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int tiny_no_front_cache; // HAKMEM_TINY_NO_FRONT_CACHE (default: 0)
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int tiny_no_quick; // HAKMEM_TINY_NO_QUICK (default: 0)
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int tiny_prefetch; // HAKMEM_TINY_PREFETCH (default: 0)
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int front_direct; // HAKMEM_TINY_FRONT_DIRECT (default: 0)
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int use_class_map; // !HAKMEM_TINY_NO_CLASS_MAP (default: 1)
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int route_enable; // HAKMEM_ROUTE (default: 0)
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int route_sample_lg; // HAKMEM_ROUTE_SAMPLE_LG (default: 10 -> 1/1024)
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int larson_fix; // HAKMEM_TINY_LARSON_FIX (default: 0)
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int active_track; // HAKMEM_TINY_ACTIVE_TRACK (default: 0)
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int drain_to_sll; // HAKMEM_TINY_DRAIN_TO_SLL (default: 0)
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int free_to_ss; // HAKMEM_TINY_FREE_TO_SS (default: 0)
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int route_free; // HAKMEM_TINY_ROUTE_FREE (default: 0)
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int sll_diag; // HAKMEM_TINY_SLL_DIAG (default: 0)
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int sll_safeheader; // HAKMEM_TINY_SLL_SAFEHEADER (default: 0)
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int sll_ring; // HAKMEM_TINY_SLL_RING (default: 0)
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int free_fast; // HAKMEM_TINY_FREE_FAST (default: 1)
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int sll_canary_fast; // HAKMEM_TINY_SLL_CANARY_FAST (default: 0)
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int ss_free_debug; // HAKMEM_SS_FREE_DEBUG (default: 0)
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int ss_adopt; // HAKMEM_TINY_SS_ADOPT (default: 1)
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int disable_remote; // HAKMEM_TINY_DISABLE_REMOTE (default: 0)
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int freelist_mask; // HAKMEM_TINY_FREELIST_MASK (default: 0)
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int alloc_1024_metric; // HAKMEM_TINY_ALLOC_1024_METRIC (default: 0)
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int tiny_profile; // HAKMEM_TINY_PROFILE (default: 0)
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int tiny_fast_stats; // HAKMEM_TINY_FAST_STATS (default: 0)
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int heap_v2_stats; // HAKMEM_TINY_HEAP_V2_STATS (default: 0)
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int front_slim; // HAKMEM_TINY_FRONT_SLIM (default: 0)
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int sfc_cascade_pct; // HAKMEM_SFC_CASCADE_PCT (default: 50)
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int sfc_cascade; // HAKMEM_TINY_SFC_CASCADE (default: 0)
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int alloc_remote_relax; // HAKMEM_TINY_ALLOC_REMOTE_RELAX (default: 0)
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int ss_empty_reuse; // HAKMEM_SS_EMPTY_REUSE (default: 1)
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int ss_empty_scan_limit; // HAKMEM_SS_EMPTY_SCAN_LIMIT (default: 32)
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int ss_acquire_debug; // HAKMEM_SS_ACQUIRE_DEBUG (default: 0)
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int tension_drain_enable; // HAKMEM_TINY_TENSION_DRAIN_ENABLE (default: 1)
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int tension_drain_threshold; // HAKMEM_TINY_TENSION_DRAIN_THRESHOLD (default: 1024)
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int alloc_route_shape; // HAKMEM_TINY_ALLOC_ROUTE_SHAPE (default: 0)
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int tiny_metadata_cache; // HAKMEM_TINY_METADATA_CACHE (default: 0)
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} tiny_env_cfg_t;
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extern tiny_env_cfg_t g_tiny_env;
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void tiny_env_init_once(void);
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static inline const tiny_env_cfg_t* tiny_env_cfg(void) {
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if (__builtin_expect(!g_tiny_env.inited, 0)) {
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tiny_env_init_once();
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}
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return &g_tiny_env;
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}
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