Calculate page table memory overhead based on page size and mapped address space.
The page table maps virtual addresses to physical frames. Each page of mapped virtual memory requires one Page Table Entry (PTE), typically 8 bytes on 64-bit systems. With standard 4KB pages, mapping 16GB of address space requires 4 million PTEs consuming 32MB of kernel memory. HugePages (2MB or 1GB) dramatically reduce this overhead by requiring far fewer PTEs for the same mapped range.
Page table size
page_table_size = (mapped_memory / page_size) × PTE_size
HugePages reduce page table overhead by 512x (2MB vs 4KB pages) and eliminate TLB misses for the huge-page-backed memory, significantly improving performance for workloads that map tens or hundreds of gigabytes.
Yes. A process mapping 1TB of virtual address space with 4KB pages needs ~2GB just for page tables. This is why large-memory workloads benefit enormously from HugePages.