The Ninety-Ninth Percentile: Operating System Internals

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 1h 2m

From Atlas, CTSS, Multics and Unix to Linux; system calls and Meltdown mitigations; scheduling from multilevel feedback queues to CFS, EEVDF and schedext; page tables, TLBs, page faults and copy on write; transparent huge pages and compaction stalls; epoll and iouring; eBPF, XDP and Cilium; DPDK, SPDK, RDMA and Seastar; fsyncgate and direct I/O; namespaces, cgroups and CPU throttling; hypervisors and nested paging; file systems, blk-mq, NVMe and flash translation layers; allocators and NUMA; the USE method, flame graphs and coordinated omission. Cross-references: ep163 (caches), ep166, ep174…