If the amount of free space available in the small object area is much greater than the size of the allocation request and yet the request can not be satisfied, the heap is fragmented.
如果小对象区域中的可用自由空间量远远大于分配请求大小，但是还无法满足请求，则表明堆中都是碎片。
The allocation system of small object memory based on STL code consists of 4 layer structures.
基于STL代码可重用的小对象内存分配体系由4层结构组成。
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