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 firstname.lastname@example.org wrote:
On Mar 30, 2018, at 08:31 AM, INADA Naoki email@example.com wrote:
As far as I know, most amd64 and arm64 systems use only 48bit address spaces. (except )
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.
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