Page Faults dives into why and how your OS handles those “oops, no page here” moments when an app touches memory that isn’t yet in RAM—triggering the kernel to fetch, allocate, or swap in a page. Along the way, you get a clear, informal tour of virtual memory, memory-mapped areas (text, data, BSS, heap, stack), and how sharing and NUMA placement keep everything efficient.
Then it breaks down every flavor of page fault—first-access, stack expansion, copy-on-write, swap-in, file-backed, and even permission faults—explaining what happens in kernel mode and why each one costs you in performance.
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