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ITLB_WALK -15% to -35% and L1I_TLB_REFILL -4% to -59% across 4 titles, but cycles/wall flat (A77 baseline iTLB pressure already negligible; 1280-entry L2 TLB covers the live JIT footprint in 4K pages). THP madvise stays default-ON: zero cost, no regression, in-order A53 upside. Adds the reusable A/B harness (env-toggle arms + in-run smaps THP probe). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>