对于图2中的示例，这应该会把扫描可释放页面的速度提高一倍多，这会降低开销。
In the example in Figure 2, this should reduce the scan-to-free rate by more than a half, which will reduce overhead.
这影响最近最少使用守护进程(least recently used daemon LRUD)扫描可释放页面的方式。
This affects how the least recently used daemon (LRUDs) scan for pages to free.
当页面惟一时，它们可以被合并，从而释放内存，供其他应用程序使用。
And when pages are unique, they can be consolidated, which frees memory for use in other applications.
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