memory: streamline mmap and page lifecycle - #289
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Reduce repeated fault and teardown overhead with indexed VMA/rmap lookups, inline reverse-map ownership, lock-free per-node free counts, unique-owner batch release, and fresh x86 demand-leaf publication without a redundant invalidation. Keep the fast paths Linux-compatible by implementing MAP_POPULATE and MAP_NONBLOCK semantics, making MAP_FIXED_NOREPLACE race-safe, coalescing eligible fixed private-anonymous VMAs, and retaining authoritative slow paths once NUMA or cpuset policy is installed. Update subsystem contracts, coverage, and the TCB safety argument. Model: OpenAI Codex (GPT-5) Co-Authored-By: OpenAI Codex <noreply@openai.com>
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Reduce repeated fault and teardown overhead with indexed VMA/rmap lookups, inline reverse-map ownership, lock-free per-node free counts, unique-owner batch release, and fresh x86 demand-leaf publication without a redundant invalidation.
Keep the fast paths Linux-compatible by implementing MAP_POPULATE and MAP_NONBLOCK semantics, making MAP_FIXED_NOREPLACE race-safe, coalescing eligible fixed private-anonymous VMAs, and retaining authoritative slow paths once NUMA or cpuset policy is installed.
Update subsystem contracts, coverage, and the TCB safety argument.
Model: OpenAI Codex (GPT-5)