Phase 4 D3: alloc gate shape (env-gated)
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@ -95,6 +95,12 @@ HAKMEM_WRAP_ENV_CACHE=1
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```
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- **Status**: ❌ FROZEN(Mixed **-1.44%** regression)→ default OFF, do not pursue
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- **Reason**: TLS overhead > benefit in Mixed workload
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- **Phase 4 D3(Alloc Gate Shape)** 🔬 NEUTRAL (research only):
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```sh
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HAKMEM_ALLOC_GATE_SHAPE=1
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```
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- **Status**: NEUTRAL(Mixed 10-run: Mean **+0.56%** / Median **-0.5%**)→ default OFF
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- **Effect**: `tiny_alloc_gate_fast()` の分岐形を簡素化(`tiny_route_get()` と release logging branch を回避)
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- v2 系は触らない(C7_SAFE では Pool v2 / Tiny v2 は常時 OFF)。
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- FREE_POLICY/THP を触る実験例(現在の HEAD では必須ではなく、組み合わせによっては微マイナスになる場合もある):
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```sh
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