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This conference talk from SREcon25 Americas explores the misconceptions programmers have about memory management in Linux systems. Join Meta kernel engineer Chris Down for a 41-minute deep dive into how kernel memory management actually works, examining both hardware-level abstractions like translation lookaside buffers and page tables, as well as Linux's internal memory classification systems. Discover the inner workings of virtual memory, CPU memory management internals, and the complex tradeoffs in modern memory management. Learn to demystify kernel and CPU behaviors around memory to improve your skills as an SRE and build more reliable systems. The presentation is part of the SREcon25 Americas program organized by USENIX.
