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Re: wait until swapoff is *actually* finished (it returns too early)?

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On Wed, Aug 21, 2024 at 08:39:37AM +0200, Erwan David wrote:
> On Wed, Aug 21, 2024 at 02:18:44AM CEST, Greg Wooledge <greg@wooledge.org> said:
> > On Tue, Aug 20, 2024 at 20:04:11 -0400, Roberto C. Sánchez wrote:
> > > sync && sync && sync && swapoff
> > > 
> > > I couldn't tell why I have sync 3 times, but I know that it's how I've
> > > called swapoff since as far back as I can remember.
> > 
> > Cargo cult.  It was never useful to the best of my knowledge.
> 
> Once upon a time, the sync command would return before the actual
> syscall where completed. Doing 3 times sync gave you a very high
> probability that the first one indeed completed all its writes.

I do remember one smart alec typing the following, he did not realise that
typing on separate lines was to slow him down:

    sync;sync;sync
    ^P
    H

^P on a PDP-11 console made it enter console state and 'H' then halted the
processor.

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  https://www.phcomp.co.uk/
Parliament Hill Computers. Registration Information: https://www.phcomp.co.uk/Contact.html
#include <std_disclaimer.h>

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wait until swapoff is *actually* finished (it returns too early)? Thorsten Glaser <tg@debian.org> - 2024-08-21 02:00 +0200
  Re: wait until swapoff is *actually* finished (it returns too early)? Roberto C. Sánchez <roberto@debian.org> - 2024-08-21 02:10 +0200
    Re: wait until swapoff is *actually* finished (it returns too early)? Greg Wooledge <greg@wooledge.org> - 2024-08-21 02:20 +0200
      Re: wait until swapoff is *actually* finished (it returns too early)? Erwan David <erwan@rail.eu.org> - 2024-08-21 08:50 +0200
        Re: wait until swapoff is *actually* finished (it returns too early)? Greg Wooledge <greg@wooledge.org> - 2024-08-21 13:40 +0200
          Re: wait until swapoff is *actually* finished (it returns too early)? Alain D D Williams <addw@phcomp.co.uk> - 2024-08-21 14:20 +0200
        Re: wait until swapoff is *actually* finished (it returns too early)? Alain D D Williams <addw@phcomp.co.uk> - 2024-08-21 13:50 +0200
      Re: wait until swapoff is *actually* finished (it returns too early)? Roberto C. Sánchez <roberto@debian.org> - 2024-08-21 13:50 +0200
  Re: wait until swapoff is *actually* finished (it returns too early)? Stefan Monnier <monnier@iro.umontreal.ca> - 2024-08-21 15:40 +0200
  Re: wait until swapoff is *actually* finished (it returns too early)? Franco Martelli <martellif67@gmail.com> - 2024-08-21 16:00 +0200
    Re: wait until swapoff is *actually* finished (it returns too early)? Thorsten Glaser <tg@debian.org> - 2024-08-21 23:20 +0200
      Re: wait until swapoff is *actually* finished (it returns too early)? Stefan Monnier <monnier@iro.umontreal.ca> - 2024-08-22 14:50 +0200
        Re: wait until swapoff is *actually* finished (it returns too early)? Mike Castle <dalgoda+debian@gmail.com> - 2024-08-22 17:50 +0200
          Re: wait until swapoff is *actually* finished (it returns too early)? Thorsten Glaser <tg@debian.org> - 2024-08-22 19:30 +0200
            Re: wait until swapoff is *actually* finished (it returns too early)? <tomas@tuxteam.de> - 2024-08-22 21:40 +0200
              Re: wait until swapoff is *actually* finished (it returns too early)? Mike Castle <dalgoda+debian@gmail.com> - 2024-08-23 05:40 +0200
            Re: wait until swapoff is *actually* finished (it returns too early)? Mike Castle <dalgoda+debian@gmail.com> - 2024-08-23 04:50 +0200
              Re: wait until swapoff is *actually* finished (it returns too early)? Thorsten Glaser <tg@debian.org> - 2024-08-23 05:20 +0200
  Re: wait until swapoff is *actually* finished (it returns too early)? Pierre-Elliott Bécue <peb@debian.org> - 2024-08-23 13:10 +0200
    Re: wait until swapoff is *actually* finished (it returns too early)? Thorsten Glaser <tg@debian.org> - 2024-08-23 22:20 +0200

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