Page Tables Are Not Free: The 1/512 Rule That Breaks Under Shared Mappings
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A 4 KiB data page costs 8 bytes to map. That is a ratio of 1 to 512. When one address space maps a page once, the page table overhead is roughly one 512th of the memory it describes, which is why most developers never think about it. The ratio is not a law. It is an assumption, and the assumption i…
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- 2026-10-05 10:15 · DEV Community — AI
Page Tables Are Not Free: The 1/512 Rule That Breaks Under Shared Mappings