On Mar 30, 2018, at 08:31 AM, INADA Naoki <songofaca...@gmail.com> wrote: Hi, As far as I know, most amd64 and arm64 systems use only 48bit address spaces. (except [1]) [1] https://software.intel.com/sites/default/files/managed/2b/80/5-level_paging_white_paper.pdf It means there are some chance to compact some data structures. I point two examples below. My question is; can we use 48bit pointer safely? Not really, at least some CPUs can also address more memory than that. See <https://lwn.net/Articles/717293/> which talks about Linux support for 57-bit virtual addresses and 52-bit physical addresses. Ronald
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