[Python-Dev] How can we use 48bit pointer safely?
Ronald Oussoren
ronaldoussoren at mac.com
Fri Mar 30 07:55:44 EDT 2018
On Mar 30, 2018, at 08:31 AM, INADA Naoki <songofacandy at 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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