TLB, page faults (minor/major), huge pages
mmap/munmap, mprotect, madvise
Syscalls & Context Switch
Signals, timers, interruption model
Schedulers (CFS basics), runqueues, affinity
IPC basics (pipes, shared memory, futex)
File Systems Internals (VFS, inode, dentry)
Networking basics (sockets, TCP, Nagle, corking)
epoll fundamentals (edge vs level)
io_uring model (SQ/CQ, submission batching)
Time sources (clock_gettime, TSC, rdtsc)
Perf counters & observability basics