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你说的是虚拟地址的布局 和分配还是有些许区别地。
5.6. Creation of a New Process
Reserving Kernel Resources
The first resource to be reserved when an address space is duplicated is the required virtual address space. To avoid running out of memory resources(为什么需要限定), the kernel must ensure that it does not promise to provide more virtual memory than it is able to deliver(以可以提供的东西作为限定标准). The total virtual memory that can be provided by the system is limited to the amount of physical memory available for paging plus the amount of swap space that is provided(什么东西是可以提供的). A few pages are held in reserve to stage I/O between the swap area and main memory.
对物理内存限定我可以理解,可是我不是很理解这个地方为什么要对虚拟内存做限定。 |
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