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

From	<tomas@tuxteam.de>
Newsgroups	linux.debian.user
Subject	Re: wait until swapoff is actually finished (it returns too early)?
Date	2024-08-22 21:40 +0200
Message-ID	<JelP3-6QTL-1@gated-at.bofh.it> (permalink)
References	(2 earlier) <Je0Uh-6DJp-1@gated-at.bofh.it> <Jefqh-6MWk-1@gated-at.bofh.it> <Jeieu-6OGL-23@gated-at.bofh.it> <JejNf-6PJA-3@gated-at.bofh.it> <JelP3-6QTL-3@gated-at.bofh.it>
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On Thu, Aug 22, 2024 at 01:45:06PM -0500, David Wright wrote:
> On Thu 22 Aug 2024 at 17:21:04 (+0000), Thorsten Glaser wrote:
> > Mike Castle dixit:

[...]

> > >I suspect that the race is that, when the the swapoff() syscall
> > >returns, the kernel has indeed moved all of the content off, so that
> > >part is fine... but it has not yet released whatever kind of resources
> > >is has on the backing store (akin to an open file handle).
> > 
> > My guess as well.
> 
> I'm not convinced. Finding out what needs copying back and locating
> somewhere to put it is AIUI a slow process.

Actually, thinking about it: if the system hasn't enough discardable
RAM, the process might take arbitrarily long, no?

Cheers
-- 
t

Thread

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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