• 外部碎片 - 引用次数：1

  To avoid external fragmentation,Linux 2.4 uses buddy allocator as its page allocator,but the main disadvantage of this algorithm is the poor performance due to repetitive coalescing and splitting. Linux 2.6 adds hot/cold page into page allocator to solve this problem.

  Linux 2.4采用伙伴系统作为页面分配器以解决外部碎片问题,但主要缺点是反复的合并和剖分操作导致性能较差,2.6内核使用热/冷页层解决该问题。

  参考来源 - 页面分配器的研究与实现
  外片段

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