linux-kernel - Re: + memcg-do-not-report-racy-no-eligible-oom-tasks.patch added to -mm tree

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Message-Id: <20190128102616.d7d63f8e1ecdf176bc313f8a@linux-foundation.org>
Date:   Mon, 28 Jan 2019 10:26:16 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Johannes Weiner <hannes@...xchg.org>, mm-commits@...r.kernel.org,
        penguin-kernel@...ove.sakura.ne.jp, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: + memcg-do-not-report-racy-no-eligible-oom-tasks.patch added to
 -mm tree

On Fri, 25 Jan 2019 18:24:16 +0100 Michal Hocko <mhocko@...nel.org> wrote:

> > >     out_of_memory
> > >       select_bad_process # no task
> > > 
> > > If Thread1 didn't race it would bail out from try_charge and force the
> > > charge.  We can achieve the same by checking tsk_is_oom_victim inside the
> > > oom_lock and therefore close the race.
> > > 
> > > [1] http://lkml.kernel.org/r/bb2074c0-34fe-8c2c-1c7d-db71338f1e7f@i-love.sakura.ne.jp
> > > Link: http://lkml.kernel.org/r/20190107143802.16847-3-mhocko@kernel.org
> > > Signed-off-by: Michal Hocko <mhocko@...e.com>
> > > Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> > > Cc: Johannes Weiner <hannes@...xchg.org>
> > > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > 
> > It looks like this problem is happening in production systems:
> > 
> > https://www.spinics.net/lists/cgroups/msg21268.html
> > 
> > where the threads don't exit because they are trapped writing out the
> > oom messages to a slow console (running the reproducer from this email
> > thread triggers the oom flooding).
> > 
> > So IMO we should put this into 5.0 and add:
> 
> Please note that Tetsuo has found out that this will not work with the
> CLONE_VM without CLONE_SIGHAND cases and his http://lkml.kernel.org/r/01370f70-e1f6-ebe4-b95e-0df21a0bc15e@i-love.sakura.ne.jp
> should handle this case as well. I've only had objections to the
> changelog but other than that the patch looked sensible to me.

So I think you're saying that 

mm-oom-marks-all-killed-tasks-as-oom-victims.patch
and
memcg-do-not-report-racy-no-eligible-oom-tasks.patch

should be dropped and that "[PATCH v2] memcg: killed threads should not
invoke memcg OOM killer" should be redone with some changelog
alterations and should be merged instead?