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Re: i386 or AMD64 - Which is currently running?

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On Mon, Jan 31, 2022 at 09:02:17PM -0500, Stefan Monnier wrote:
>Greg Wooledge [2022-01-31 16:45:52] wrote:
>> On Mon, Jan 31, 2022 at 04:37:37PM -0500, Stefan Monnier wrote:
>>> BTW, for the twisted-minded it's probably possible to run a 64bit
>>> userspace on a 32bit kernel.
>> No.  Or at least, not that I've ever heard of.  If technology has been
>> invented to make this possible, it's new to me.
>
>I don't think there's any need to invent anything for that.  I don't see
>anything particularly hard about emulating a 64bit instruction set on
>a 32bit system.  Performance may not be great, but that's a secondary concern.

that's not running a 64bit userspace on a 32bit kernel, that's running a 
64bit userspace on an emulator running in 32bit userspace on a 32bit kernel

this is unlike running the i386 userspace on an amd64 kernel (something 
that's not particularly uncommon and has certain advantages)--you cannot 
run the amd64 userspace on an i386 kernel

linux was not the first to do that, and many systems let you run 
binaries from an older version on a newer version, but I'm not aware of 
any that worked the other way around

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i386 or AMD64 - Which is currently running? Richard Owlett <rowlett@cloud85.net> - 2022-01-31 13:40 +0100
  Re: i386 or AMD64 - Which is currently running? Curt <curty@free.fr> - 2022-01-31 13:40 +0100
    Re: i386 or AMD64 - Which is currently running? Richard Owlett <rowlett@cloud85.net> - 2022-01-31 17:00 +0100
      Re: i386 or AMD64 - Which is currently running? Curt <curty@free.fr> - 2022-01-31 17:40 +0100
        Re: i386 or AMD64 - Which is currently running? Greg Wooledge <greg@wooledge.org> - 2022-01-31 17:40 +0100
          Re: i386 or AMD64 - Which is currently running? Brian <ad44@cityscape.co.uk> - 2022-01-31 21:10 +0100
            Re: i386 or AMD64 - Which is currently running? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-01-31 22:40 +0100
              Re: i386 or AMD64 - Which is currently running? Greg Wooledge <greg@wooledge.org> - 2022-01-31 22:50 +0100
                Re: i386 or AMD64 - Which is currently running? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-02-01 03:10 +0100
                Re: i386 or AMD64 - Which is currently running? David Wright <deblis@lionunicorn.co.uk> - 2022-02-01 04:00 +0100
                Re: i386 or AMD64 - Which is currently running? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-02-01 06:30 +0100
                Re: i386 or AMD64 - Which is currently running? Michael Stone <mstone@debian.org> - 2022-02-01 04:20 +0100
                Re: i386 or AMD64 - Which is currently running? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-02-01 06:40 +0100
                Re: i386 or AMD64 - Which is currently running? Michael Stone <mstone@debian.org> - 2022-02-01 14:40 +0100
              Re: i386 or AMD64 - Which is currently running? Richard Owlett <rowlett@cloud85.net> - 2022-02-01 01:40 +0100
              Re: i386 or AMD64 - Which is currently running? <tomas@tuxteam.de> - 2022-02-01 06:50 +0100
              Re: i386 or AMD64 - Which is currently running? Curt <curty@free.fr> - 2022-02-01 13:30 +0100
                Re: i386 or AMD64 - Which is currently running? Stanislav Vlasov <stanislav.v.v@gmail.com> - 2022-02-01 17:20 +0100
                Re: i386 or AMD64 - Which is currently running? Curt <curty@free.fr> - 2022-02-01 18:50 +0100
            CLARIFICATION --- Re: i386 or AMD64 - Which is currently running? Richard Owlett <rowlett@cloud85.net> - 2022-02-01 01:40 +0100
              Re: CLARIFICATION --- Re: i386 or AMD64 - Which is currently running? songbird <songbird@anthive.com> - 2022-02-01 07:20 +0100
                Re: CLARIFICATION --- Re: i386 or AMD64 - Which is currently running? Richard Owlett <rowlett@cloud85.net> - 2022-02-01 13:10 +0100
      Re: i386 or AMD64 - Which is currently running? Stefan Krusche <linux@stefan-krusche.de> - 2022-02-01 11:50 +0100
  Re: i386 or AMD64 - Which is currently running? Greg Wooledge <greg@wooledge.org> - 2022-01-31 14:40 +0100
    Re: i386 or AMD64 - Which is currently running? David Wright <deblis@lionunicorn.co.uk> - 2022-01-31 17:50 +0100
  Re: i386 or AMD64 - Which is currently running? Teemu Likonen <tlikonen@iki.fi> - 2022-01-31 14:40 +0100
    Re: i386 or AMD64 - Which is currently running? Greg Wooledge <greg@wooledge.org> - 2022-01-31 14:40 +0100
  Re: i386 or AMD64 - Which is currently running? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-01-31 14:40 +0100
  Re: i386 or AMD64 - Which is currently running? David Wright <deblis@lionunicorn.co.uk> - 2022-01-31 20:20 +0100

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