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The design of most modern operating systems employs flat memory model where the segments concept introduced with Intel 80286 is not in use and Linux among them. The OS kernel requires the user process memory space to be directly addressable by the kernel in favor of performance, so the 2^32 address space is split between the kernel and a user space process. ...


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The operating system will not use more memory than it can handle in its allocation table. Since the maximum number of bytes that can be represented with 32 bits is 4 294 967 296, that limits the memory to 4GB. On 64 bit systems, the maximum would therefore be 18 446 744 073 709 551 616 bytes (16 777 216 TB) which will obviously not be an issue for ...



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