外部碎片(external fragmentation)是空闲的记忆体空间合起来可以满足一个请求,但是没有一个单独的空间可以满足这个请求。
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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·2,447,543篇论文数据，部分数据来源于NoteExpress
金属板材建设，具有可移动外部碎片套。
Sheet metal construction, with a removable outer fragmentation sleeve.
当钢化玻璃被外部力量破坏碎裂时立即形成无锐角的玻璃碎片，从而减少和避免对人体的伤害。
When the glass breaks caused by external the force of the glass shatters instantly and free of sharp pieces. So as lessen or avoid the injury to human body.
在某些情况下，将落鱼的外部彻底磨铣，使落鱼体和剩余的碎片能被推至井筒底部。
In some cases, the outer portion of a fish may be milled out to allow the body and remaining debris to be pushed to the bottom of the wellbore.
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