operating system memory allocation process
操作系统内存分配过程
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The advantage of allocation mechanism is that once physical memory is allocated operating system can't reclaim it until either the process is terminated or the process frees memory back to the OS.
这种分配机制的好处是不会被系统回收，直到进程终止或者进程内存被释放会操作系统。
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