1798ed656d
Research Box Implementation: - core/box/tiny_static_route_box.h: TinyStaticRoute struct & API - core/box/tiny_static_route_box.c: Static route table management - Makefile: Added tiny_static_route_box.o to 3 OBJS lists Design: - ENV gate: HAKMEM_TINY_STATIC_ROUTE=0/1 (default: 0) - Learner auto-disable: If HAKMEM_TINY_LEARNER_ENABLED=1, force OFF - Constructor priority: 102 (runs after wrapper_env_ctor at 101) - Thread-safe: Atomic CAS for exactly-once initialization Baseline Profiling (Step 0 Complete): - Throughput: 46.2M ops/s (10M iterations × 400 ws) - Instructions/cycle: 2.11 insn/cycle - Frontend stalls: 10.62% (memory latency bottleneck) - Cache-misses: 3.46% of references Expected C3 gain: +5-8% (policy_snapshot bypass) Next Steps (Step 1B onwards): 1. Integrate static route into malloc_tiny_fast_for_class() 2. A/B test: Mixed 10-run, expect +1% minimum for GO 3. Decision: GO if +1%, NO-GO if -1%, else freeze Status: ✅ Phase 2 (B3+B4): +4.4% cumulative ✅ Phase 3 planning & C3 Step 0-1A complete ⏳ Phase 3 C3 Step 1B-3 pending (malloc integration & testing) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
29 lines
1010 B
C
29 lines
1010 B
C
// tiny_static_route_box.h - Static routing table for policy_snapshot bypass (Phase 3 C3)
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// Eliminates per-malloc policy_snapshot + learner evaluation overhead
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// ENV gate: HAKMEM_TINY_STATIC_ROUTE=0/1 (default 0)
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#pragma once
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#include "smallobject_policy_v7_box.h"
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typedef struct {
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int inited;
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SmallRouteKind route_kind[8]; // C0-C7 static route (determined at init, no learner update)
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} TinyStaticRoute;
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extern TinyStaticRoute g_tiny_static_route;
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// Initialize static route table (called once, at library load time)
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// Returns 1 if static routing is enabled and initialized, 0 otherwise
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int tiny_static_route_init_once(void);
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// Get static route for class_idx, or 0 if not enabled
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// (Returns route_kind, or 0 if disabled/uninitialized)
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SmallRouteKind tiny_static_route_get_kind(int class_idx);
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// Refresh from ENV (for bench_apply_profile() sync)
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void tiny_static_route_refresh_from_env(void);
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// Check if static routing is enabled (cached ENV value)
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int tiny_static_route_enabled(void);
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