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Re: [PATCH] mm: add config option to select the initial overcommit mode

From Michal Hocko <mhocko@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH] mm: add config option to select the initial overcommit mode
Date 2016-05-13 12:00 +0200
Message-ID <ryi30-PV-7@gated-at.bofh.it> (permalink)
References <rxeuu-1FZ-29@gated-at.bofh.it> <rygkz-7Xv-33@gated-at.bofh.it> <rygXg-8iE-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Fri 13-05-16 10:44:30, Mason wrote:
> On 13/05/2016 10:04, Michal Hocko wrote:
> 
> > On Tue 10-05-16 13:56:30, Sebastian Frias wrote:
> > [...]
> >> NOTE: I understand that the overcommit mode can be changed dynamically thru
> >> sysctl, but on embedded systems, where we know in advance that overcommit
> >> will be disabled, there's no reason to postpone such setting.
> > 
> > To be honest I am not particularly happy about yet another config
> > option. At least not without a strong reason (the one above doesn't
> > sound that way). The config space is really large already.
> > So why a later initialization matters at all? Early userspace shouldn't
> > consume too much address space to blow up later, no?
> 
> One thing I'm not quite clear on is: why was the default set
> to over-commit on?

Because many applications simply rely on large and sparsely used address
space, I guess. That's why the default is GUESS where we ignore the
cumulative charges and simply check the current state and blow up only
when the current request is way too large.
-- 
Michal Hocko
SUSE Labs

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Thread

Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 10:10 +0200
  Re: [PATCH] mm: add config option to select the initial overcommit  mode Mason <slash.tmp@free.fr> - 2016-05-13 10:50 +0200
    Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 12:00 +0200
      Re: [PATCH] mm: add config option to select the initial overcommit  mode Mason <slash.tmp@free.fr> - 2016-05-13 12:20 +0200
        Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 12:50 +0200
        Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 13:50 +0200
          Re: [PATCH] mm: add config option to select the initial overcommit  mode Mason <slash.tmp@free.fr> - 2016-05-13 14:20 +0200
            Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 16:10 +0200
              Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 16:20 +0200
              Re: [PATCH] mm: add config option to select the initial overcommit  mode One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-05-13 17:10 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 17:40 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-05-13 17:50 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-17 10:30 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-17 11:00 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-17 18:20 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-17 19:30 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-18 17:20 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-18 18:30 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-17 22:20 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-18 17:20 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-19 09:20 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-13 19:10 +0200
        Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-13 15:30 +0200
    Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 12:00 +0200
      Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 14:10 +0200
        Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 14:40 +0200
          Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-13 15:20 +0200
            Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 15:40 +0200
              Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-13 16:20 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 16:30 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-13 17:10 +0200
              Re: [PATCH] mm: add config option to select the initial overcommit  mode One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-05-13 17:10 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 17:20 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 17:30 +0200
            Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 15:40 +0200
              Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-13 16:00 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 16:40 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 17:00 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-05-13 17:20 +0200
          Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 17:00 +0200
            Re: [PATCH] mm: add config option to select the initial overcommit  mode Mason <slash.tmp@free.fr> - 2016-05-13 17:00 +0200
              Re: [PATCH] mm: add config option to select the initial overcommit  mode One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-05-13 17:20 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Michal Hocko <mhocko@kernel.org> - 2016-05-13 17:30 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 17:40 +0200
            Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-13 17:20 +0200
              Re: [PATCH] mm: add config option to select the initial overcommit  mode One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-05-13 17:50 +0200
                Re: [PATCH] mm: add config option to select the initial overcommit  mode Sebastian Frias <sf84@laposte.net> - 2016-05-23 15:20 +0200

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