Not only that, but afaik Linux could simply raise that 57bit virtual to 64bit virtual without previous warning on any version change.
On 30 March 2018 at 08:55, Ronald Oussoren <ronaldousso...@mac.com> wrote: > > > 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 > > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/jsbueno%40python.org.br > _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
