> Today the most complicated page table structures comprise four levels.
> Figure 4.2 shows the schematics of such an implementation."
This is true for Linux and x86. I know at least one system that support up
to 5 levels: s390x. Currently it only uses 3 of the 5 levels on Linux,
which gives 4TB of virtual memory, but this can be bumped to 4 levels or 5
levels if necessary offering a full 64bit virtual address space.
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