Refining Core Development Skills
Mar 25, 2025 · Fundamentals
Understanding Linux Kernel Physical Memory Management and the memblock Allocator
Linux does not expose all physical memory to users; this article explains why the kernel reserves memory, detailing the early memblock allocator, crash kernel reservations, page structure overhead, and the handoff to the buddy system, illustrating how these mechanisms consume several hundred megabytes of RAM.
Crash KernelKernelLinux
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