这么做可以限制内存中 “脏” 页面的数量，从而进一步减少 I/O 开销和磁盘碎片。
The reason for this is to limit the amount of dirty pages in memory, which further reduces I/O overhead and disk fragmentation.
SACOS的动态内存管理方法可以有效地减少内存管理开销和内存碎片，提高内存的利用率。
The dynamic memory management of SACOS can decrease efficiently the memory management overhead and memory fragmentation and improve the memory utilization.
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