OPPO Kernel Craftsman
Jul 3, 2020 · Fundamentals
Overview of Linux Physical Memory Fragmentation and Management
Linux uses a buddy‑system allocator organized into nodes and zones to manage physical memory, distinguishing internal fragmentation (unused space within allocated blocks) from external fragmentation (insufficient contiguous free blocks), and mitigates the latter through memory compaction, the kcompactd daemon, and various allocation‑policy optimizations.
Buddy SystemMemory CompactionPhysical Fragmentation
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