[PATCH 0/2] mm, oom: do not grant oom victims full memory reserves access

From	Michal Hocko <mhocko@kernel.org>
Newsgroups	linux.kernel
Subject	[PATCH 0/2] mm, oom: do not grant oom victims full memory reserves access
Date	2017-07-27 11:10 +0200
Message-ID	<u7MXU-4d2-17@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,
this is a part of a larger series I posted back in Oct last year [1]. I
have dropped patch 3 because it was incorrect and patch 4 is not
applicable without it.

The primary reason to apply patch 1 is to remove a risk of the complete
memory depletion by oom victims. While this is a theoretical risk right
now there is a demand for memcg aware oom killer which might kill all
processes inside a memcg which can be a lot of tasks. That would make
the risk quite real.

This issue is addressed by limiting access to memory reserves. We no
longer use TIF_MEMDIE to grant the access and use tsk_is_oom_victim
instead. See Patch 1 for more details. Patch 2 is a trivial follow up
cleanup.

I would still like to get rid of TIF_MEMDIE completely but I do not have
time to do it now and it is not a pressing issue.

[1] http://lkml.kernel.org/r/20161004090009.7974-1-mhocko@kernel.org

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[PATCH 0/2] mm, oom: do not grant oom victims full memory reserves access Michal Hocko <mhocko@kernel.org> - 2017-07-27 11:10 +0200
  [PATCH 1/2] mm, oom: do not rely on TIF_MEMDIE for memory reserves access Michal Hocko <mhocko@kernel.org> - 2017-07-27 11:10 +0200
  [PATCH 2/2] mm: replace TIF_MEMDIE checks by tsk_is_oom_victim Michal Hocko <mhocko@kernel.org> - 2017-07-27 11:20 +0200
    Re: [PATCH 2/2] mm: replace TIF_MEMDIE checks by tsk_is_oom_victim Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-07-27 16:10 +0200
    Re: [PATCH 2/2] mm: replace TIF_MEMDIE checks by tsk_is_oom_victim Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-07-27 16:10 +0200
      Re: [PATCH 2/2] mm: replace TIF_MEMDIE checks by tsk_is_oom_victim Michal Hocko <mhocko@kernel.org> - 2017-07-27 16:20 +0200
      Re: [PATCH 2/2] mm: replace TIF_MEMDIE checks by tsk_is_oom_victim Michal Hocko <mhocko@kernel.org> - 2017-07-27 16:50 +0200
    Re: [PATCH 2/2] mm: replace TIF_MEMDIE checks by tsk_is_oom_victim Michal Hocko <mhocko@kernel.org> - 2017-07-31 08:50 +0200

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