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Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware OOM killer

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On Thu, 7 Sep 2017, Christopher Lameter wrote:

> > SGI required it when it was introduced simply to avoid the very expensive
> > tasklist scan.  Adding Christoph Lameter to the cc since he was involved
> > back then.
> 
> Really? From what I know and worked on way back when: The reason was to be
> able to contain the affected application in a cpuset. Multiple apps may
> have been running in multiple cpusets on a large NUMA machine and the OOM
> condition in one cpuset should not affect the other. It also helped to
> isolate the application behavior causing the oom in numerous cases.
> 
> Doesnt this requirement transfer to cgroups in the same way?
> 
> Left SGI in 2008 so adding Dimitri who may know about the current
> situation. Robin Holt also left SGI as far as I know.
> 

It may have been Paul Jackson, but I remember the oom_kill_allocating_task 
knob being required due to very slow oom killer due to the very lengthy 
iteration of the tasklist.  It would be helpful if someone from SGI could 
confirm whether or not they actively use this sysctl.

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Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Michal Hocko <mhocko@kernel.org> - 2017-09-05 15:50 +0200
  Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Michal Hocko <mhocko@kernel.org> - 2017-09-05 17:20 +0200
    Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Michal Hocko <mhocko@kernel.org> - 2017-09-06 10:50 +0200
      Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Michal Hocko <mhocko@kernel.org> - 2017-09-06 20:00 +0200
      Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer David Rientjes <rientjes@google.com> - 2017-09-06 23:00 +0200
        Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Christopher Lameter <cl@linux.com> - 2017-09-07 16:50 +0200
          Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Christopher Lameter <cl@linux.com> - 2017-09-07 17:10 +0200
            Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Christopher Lameter <cl@linux.com> - 2017-09-07 19:10 +0200
          Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer David Rientjes <rientjes@google.com> - 2017-09-08 00:00 +0200
    Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Christopher Lameter <cl@linux.com> - 2017-09-07 18:30 +0200
  Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Johannes Weiner <hannes@cmpxchg.org> - 2017-09-06 00:00 +0200
    Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Michal Hocko <mhocko@kernel.org> - 2017-09-06 10:30 +0200
      Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Johannes Weiner <hannes@cmpxchg.org> - 2017-09-07 18:20 +0200
      Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Christopher Lameter <cl@linux.com> - 2017-09-07 18:30 +0200
        Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer David Rientjes <rientjes@google.com> - 2017-09-08 00:10 +0200
          Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer Christopher Lameter <cl@linux.com> - 2017-09-08 23:10 +0200
            Re: [v7 5/5] mm, oom: cgroup v2 mount option to disable cgroup-aware  OOM killer David Rientjes <rientjes@google.com> - 2017-09-09 10:50 +0200

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