A 25,000-word deep dive explains the topic through dialogues between a new
process, Alloca, and the Kernel, with Key Takeaway boxes summarizing each
section. It starts from first principles — isolation and protection — then
covers the x86-64 layout, where only 48 bits translate, yielding 256 TiB
that Linux splits evenly between user space and kernel mappings. It walks
through text, data, BSS, the heap (grown via brk), the vast unmapped middle
holding shared libraries and mmap regions, and the stack, then tackles
hierarchical page tables, MMU and TLB behavior, demand paging,
copy-on-write, page reclaim and swap, huge pages, TLB shootdowns, and NUMA
placement. A 60-page PDF/EPUB version is also on sale.
1
u/fagnerbrack 7h ago
One-minute summary:
A 25,000-word deep dive explains the topic through dialogues between a new process, Alloca, and the Kernel, with Key Takeaway boxes summarizing each section. It starts from first principles — isolation and protection — then covers the x86-64 layout, where only 48 bits translate, yielding 256 TiB that Linux splits evenly between user space and kernel mappings. It walks through text, data, BSS, the heap (grown via brk), the vast unmapped middle holding shared libraries and mmap regions, and the stack, then tackles hierarchical page tables, MMU and TLB behavior, demand paging, copy-on-write, page reclaim and swap, huge pages, TLB shootdowns, and NUMA placement. A 60-page PDF/EPUB version is also on sale.
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