From: Michal Hocko <mhocko@kernel.org>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: Shakeel Butt <shakeelb@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Roman Gushchin <guro@fb.com>, Greg Thelen <gthelen@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux MM <linux-mm@kvack.org>, Cgroups <cgroups@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] memcg: oom: ignore oom warnings from memory.max
Date: Mon, 4 May 2020 10:03:08 +0200 [thread overview]
Message-ID: <20200504080308.GI22838@dhcp22.suse.cz> (raw)
In-Reply-To: <CALOAHbDd8hjURSi9jAdjQTbSLDvu9vkOkjS1hZNn04G8Yj7WdQ@mail.gmail.com>
On Mon 04-05-20 15:40:18, Yafang Shao wrote:
> On Mon, May 4, 2020 at 3:35 PM Michal Hocko <mhocko@kernel.org> wrote:
> >
> > On Mon 04-05-20 15:26:52, Yafang Shao wrote:
[...]
> > > As explianed above, no eligible task is different from no task.
> > > If there are some candidates but no one is eligible, the system will panic.
> > > While if there's no task, it is definitely no OOM, because that's an
> > > improssible thing for the system.
> >
> > This is very much possible situation when all eligible tasks have been
> > already killed but they didn't really help to resolve the oom situation
> > - e.g. in kernel memory leak or unbounded shmem consumption etc...
> >
>
> That's still an impossible thing, because many tasks are invisible to
> the oom killer.
> See oom_unkillable_task().
I do not follow, really. oom_unkillable_task only says that global init
cannot be killed and that it doesn't make any sense to kill kernel
threads as they do not own any mm normally.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-05-04 8:03 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 18:27 Shakeel Butt
2020-04-30 19:06 ` Roman Gushchin
2020-04-30 19:30 ` Johannes Weiner
2020-04-30 20:23 ` Roman Gushchin
2020-04-30 19:31 ` Shakeel Butt
2020-04-30 19:29 ` Johannes Weiner
2020-04-30 20:20 ` Shakeel Butt
2020-05-04 6:57 ` Michal Hocko
2020-05-04 13:54 ` Shakeel Butt
2020-05-01 1:39 ` Yafang Shao
2020-05-01 2:04 ` Shakeel Butt
2020-05-01 2:12 ` Yafang Shao
2020-05-04 7:03 ` Michal Hocko
2020-05-04 7:26 ` Yafang Shao
2020-05-04 7:35 ` Michal Hocko
2020-05-04 7:40 ` Yafang Shao
2020-05-04 8:03 ` Michal Hocko [this message]
2020-05-04 6:56 ` Michal Hocko
2020-05-04 13:54 ` Shakeel Butt
2020-05-04 14:11 ` Michal Hocko
2020-05-04 14:53 ` Shakeel Butt
2020-05-04 15:00 ` Michal Hocko
2020-05-04 15:35 ` Shakeel Butt
2020-05-04 15:39 ` Yafang Shao
2020-05-04 16:06 ` Michal Hocko
2020-05-04 19:23 ` Shakeel Butt
2020-05-05 7:13 ` Michal Hocko
2020-05-05 15:03 ` Shakeel Butt
2020-05-05 16:57 ` Johannes Weiner
2020-05-05 15:27 ` Johannes Weiner
2020-05-05 15:35 ` Shakeel Butt
2020-05-05 15:49 ` Michal Hocko
2020-05-05 16:40 ` Johannes Weiner
2020-05-04 14:20 ` Tetsuo Handa
2020-05-04 14:57 ` Shakeel Butt
2020-05-04 15:44 ` Tetsuo Handa
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