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From: Michal Hocko <mhocko@kernel.org>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Roman Gushchin <guro@fb.com>,
	akpm@linux-foundation.org, linux-mm@kvack.org,
	rientjes@google.com, hannes@cmpxchg.org, tj@kernel.org,
	gthelen@google.com
Subject: Re: cgroup-aware OOM killer, how to move forward
Date: Wed, 25 Jul 2018 15:01:23 +0200	[thread overview]
Message-ID: <20180725130123.GM28386@dhcp22.suse.cz> (raw)
In-Reply-To: <33510f1b-e038-8266-6482-f8f8891e5514@i-love.sakura.ne.jp>

On Wed 25-07-18 21:23:11, Tetsuo Handa wrote:
> Michal, I think that I hit WQ OOM lockup caused by lack of guaranteed schedule_timeout_*() for WQ.
> I think we should immediately send https://marc.info/?l=linux-mm&m=153062798103081
> (or both http://lkml.kernel.org/r/20180709074706.30635-1-mhocko@kernel.org and
> https://marc.info/?l=linux-mm&m=152723708623015 ) to linux.git so that we can send
> to stable kernels without waiting for "mm, oom: cgroup-aware OOM killer" patchset.

Then do not pollute unrelated threads. Really! The patch to drop the
sleep from the oom_lock is in mmotm tree already. I really do not see
why you make it more important than it really is (ohhh it is the dubious
CVE you have filed?).

If you have hit a WQ OOM lockup beucase of a missing schedule_timeout
then report it in a new email thread and we can discuss the proper way
of handling it.

Thanks!
-- 
Michal Hocko
SUSE Labs

      reply	other threads:[~2018-07-25 13:01 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-11 22:40 cgroup-aware OOM killer, how to move forward Roman Gushchin
2018-07-12 12:07 ` Michal Hocko
2018-07-12 15:55   ` Roman Gushchin
2018-07-13 21:34 ` David Rientjes
2018-07-13 22:16   ` Roman Gushchin
2018-07-13 22:39     ` David Rientjes
2018-07-13 23:05       ` Roman Gushchin
2018-07-13 23:11         ` David Rientjes
2018-07-13 23:16           ` Roman Gushchin
2018-07-17  4:19             ` David Rientjes
2018-07-17 12:41               ` Michal Hocko
2018-07-17 17:38               ` Roman Gushchin
2018-07-17 19:49                 ` Michal Hocko
2018-07-17 20:06                   ` Roman Gushchin
2018-07-17 20:41                     ` David Rientjes
2018-07-17 20:52                       ` Roman Gushchin
2018-07-20  8:30                         ` David Rientjes
2018-07-20 11:21                           ` Tejun Heo
2018-07-20 16:13                             ` Roman Gushchin
2018-07-20 20:28                             ` David Rientjes
2018-07-20 20:47                               ` Roman Gushchin
2018-07-23 23:06                                 ` David Rientjes
2018-07-23 14:12                               ` Michal Hocko
2018-07-18  8:19                       ` Michal Hocko
2018-07-18  8:12                     ` Michal Hocko
2018-07-18 15:28                       ` Roman Gushchin
2018-07-19  7:38                         ` Michal Hocko
2018-07-19 17:05                           ` Roman Gushchin
2018-07-20  8:32                             ` David Rientjes
2018-07-23 14:17                             ` Michal Hocko
2018-07-23 15:09                               ` Tejun Heo
2018-07-24  7:32                                 ` Michal Hocko
2018-07-24 13:08                                   ` Tejun Heo
2018-07-24 13:26                                     ` Michal Hocko
2018-07-24 13:31                                       ` Tejun Heo
2018-07-24 13:50                                         ` Michal Hocko
2018-07-24 13:55                                           ` Tejun Heo
2018-07-24 14:25                                             ` Michal Hocko
2018-07-24 14:28                                               ` Tejun Heo
2018-07-24 14:35                                                 ` Tejun Heo
2018-07-24 14:43                                                 ` Michal Hocko
2018-07-24 14:49                                                   ` Tejun Heo
2018-07-24 15:52                                                     ` Roman Gushchin
2018-07-25 12:00                                                       ` Michal Hocko
2018-07-25 11:58                                                     ` Michal Hocko
2018-07-30  8:03                                       ` Michal Hocko
2018-07-30 14:04                                         ` Tejun Heo
2018-07-30 15:29                                           ` Roman Gushchin
2018-07-24 11:59 ` Tetsuo Handa
2018-07-25  0:10   ` Roman Gushchin
2018-07-25 12:23     ` Tetsuo Handa
2018-07-25 13:01       ` Michal Hocko [this message]

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