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From: Michal Hocko <mhocko@kernel.org>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, Johannes Weiner <hannes@cmpxchg.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/2] oom, memcg: do not report racy no-eligible OOM
Date: Fri, 11 Jan 2019 12:33:54 +0100	[thread overview]
Message-ID: <20190111113354.GD14956@dhcp22.suse.cz> (raw)
In-Reply-To: <fbdfdfeb-5664-ddf3-4d65-c64f9851ac26@i-love.sakura.ne.jp>

On Fri 11-01-19 19:25:22, Tetsuo Handa wrote:
> On 2019/01/11 8:59, Tetsuo Handa wrote:
> > Michal Hocko wrote:
> >> On Wed 09-01-19 20:34:46, Tetsuo Handa wrote:
> >>> On 2019/01/09 20:03, Michal Hocko wrote:
> >>>> Tetsuo,
> >>>> can you confirm that these two patches are fixing the issue you have
> >>>> reported please?
> >>>>
> >>>
> >>> My patch fixes the issue better than your "[PATCH 2/2] memcg: do not
> >>> report racy no-eligible OOM tasks" does.
> >>
> >> OK, so we are stuck again. Hooray!
> > 
> > Andrew, will you pick up "[PATCH 3/2] memcg: Facilitate termination of memcg OOM victims." ?
> > Since mm-oom-marks-all-killed-tasks-as-oom-victims.patch does not call mark_oom_victim()
> > when task_will_free_mem() == true, memcg-do-not-report-racy-no-eligible-oom-tasks.patch
> > does not close the race whereas my patch closes the race better.
> > 
> 
> I confirmed that mm-oom-marks-all-killed-tasks-as-oom-victims.patch and
> memcg-do-not-report-racy-no-eligible-oom-tasks.patch are completely failing
> to fix the issue I am reporting. :-(

OK, this is really interesting. This means that we are racing
when marking all the tasks sharing the mm with the clone syscall.
Does fatal_signal_pending handle this better?
-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2019-01-11 11:33 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-07 14:38 [PATCH 0/2] oom, memcg: do not report racy no-eligible OOM Michal Hocko
2019-01-07 14:38 ` [PATCH 1/2] mm, oom: marks all killed tasks as oom victims Michal Hocko
2019-01-07 20:58   ` Tetsuo Handa
2019-01-08  8:11     ` Michal Hocko
2019-01-07 14:38 ` [PATCH 2/2] memcg: do not report racy no-eligible OOM tasks Michal Hocko
2019-01-07 20:59   ` Tetsuo Handa
2019-01-08  8:14     ` Michal Hocko
2019-01-08 10:39       ` Tetsuo Handa
2019-01-08 11:46         ` Michal Hocko
2019-01-08  8:35   ` kbuild test robot
2019-01-08  9:39     ` Michal Hocko
2019-01-11  0:23       ` [kbuild-all] " Rong Chen
2019-01-08 14:21 ` [PATCH 3/2] memcg: Facilitate termination of memcg OOM victims Tetsuo Handa
2019-01-08 14:38   ` Michal Hocko
2019-01-09 11:03 ` [PATCH 0/2] oom, memcg: do not report racy no-eligible OOM Michal Hocko
2019-01-09 11:34   ` Tetsuo Handa
2019-01-09 12:02     ` Michal Hocko
2019-01-10 23:59       ` Tetsuo Handa
2019-01-11 10:25         ` Tetsuo Handa
2019-01-11 11:33           ` Michal Hocko [this message]
2019-01-11 12:40             ` Tetsuo Handa
2019-01-11 13:34               ` Michal Hocko
2019-01-11 14:31                 ` Tetsuo Handa
2019-01-11 15:07                   ` Michal Hocko
2019-01-11 15:37                     ` Tetsuo Handa
2019-01-11 16:45                       ` Michal Hocko
2019-01-12 10:52                         ` Tetsuo Handa
2019-01-13 17:36                           ` Michal Hocko

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