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Re: [patch] mm, oom: prevent additional oom kills before memory is freed

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On Thu, 15 Jun 2017, Michal Hocko wrote:

> > Yes, quite a bit in testing.
> > 
> > One oom kill shows the system to be oom:
> > 
> > [22999.488705] Node 0 Normal free:90484kB min:90500kB ...
> > [22999.488711] Node 1 Normal free:91536kB min:91948kB ...
> > 
> > followed up by one or more unnecessary oom kills showing the oom killer 
> > racing with memory freeing of the victim:
> > 
> > [22999.510329] Node 0 Normal free:229588kB min:90500kB ...
> > [22999.510334] Node 1 Normal free:600036kB min:91948kB ...
> > 
> > The patch is absolutely required for us to prevent continuous oom killing 
> > of processes after a single process has been oom killed and its memory is 
> > in the process of being freed.
> 
> OK, could you play with the patch/idea suggested in
> http://lkml.kernel.org/r/20170615122031.GL1486@dhcp22.suse.cz?
> 

I cannot, I am trying to unblock a stable kernel release to my production 
that is obviously fixed with this patch and cannot experiment with 
uncompiled and untested patches that introduce otherwise unnecessary 
locking into the __mmput() path and is based on speculation rather than 
hard data that __mmput() for some reason stalls for the oom victim's mm.  
I was hoping that this fix could make it in time for 4.12 since 4.12 kills 
1-4 processes unnecessarily for each oom condition and then can review any 
tested solution you may propose at a later time.

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[patch] mm, oom: prevent additional oom kills before memory is  freed David Rientjes <rientjes@google.com> - 2017-06-15 01:50 +0200
  Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-15 12:50 +0200
    Re: [patch] mm, oom: prevent additional oom kills before memory is freed Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-15 13:00 +0200
      Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-15 13:10 +0200
        Re: [patch] mm, oom: prevent additional oom kills before memory is freed Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-15 13:40 +0200
          Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-15 14:10 +0200
            Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-15 14:20 +0200
              Re: [patch] mm, oom: prevent additional oom kills before memory is freed Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-15 15:10 +0200
                Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-15 15:30 +0200
                Re: [patch] mm, oom: prevent additional oom kills before memory is freed Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-15 23:50 +0200
                Re: [patch] mm, oom: prevent additional oom kills before memory is  freed David Rientjes <rientjes@google.com> - 2017-06-15 23:40 +0200
        Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-15 14:30 +0200
    Re: [patch] mm, oom: prevent additional oom kills before memory is  freed David Rientjes <rientjes@google.com> - 2017-06-15 23:30 +0200
      Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-15 23:50 +0200
        Re: [patch] mm, oom: prevent additional oom kills before memory is  freed David Rientjes <rientjes@google.com> - 2017-06-16 00:10 +0200
          Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-16 00:20 +0200
            Re: [patch] mm, oom: prevent additional oom kills before memory is  freed David Rientjes <rientjes@google.com> - 2017-06-16 00:50 +0200
              Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-16 10:10 +0200
            Re: Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> - 2017-06-16 03:00 +0200
              Re: [patch] mm, oom: prevent additional oom kills before memory is freed Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> - 2017-06-16 06:10 +0200
              Re: Re: [patch] mm, oom: prevent additional oom kills before memory  is freed Michal Hocko <mhocko@kernel.org> - 2017-06-16 10:40 +0200
                Re: Re: [patch] mm, oom: prevent additional oom kills before memory is freed Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-16 12:30 +0200
                Re: Re: [patch] mm, oom: prevent additional oom kills before memory  is freed Michal Hocko <mhocko@kernel.org> - 2017-06-16 13:10 +0200
                Re: Re: [patch] mm, oom: prevent additional oom kills before memoryis freed Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-16 16:30 +0200
                Re: Re: [patch] mm, oom: prevent additional oom kills before  memoryis freed Michal Hocko <mhocko@kernel.org> - 2017-06-16 16:50 +0200
                Re: Re: [patch] mm, oom: prevent additional oom kills before memory is freed Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-17 15:40 +0200
        Re: [patch] mm, oom: prevent additional oom kills before memory is freed Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-16 14:30 +0200
          Re: [patch] mm, oom: prevent additional oom kills before memory is  freed Michal Hocko <mhocko@kernel.org> - 2017-06-16 16:20 +0200
            [PATCH] mm,oom_kill: Close race window of needlessly selecting new victims. Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-06-17 07:20 +0200

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