From: Michal Hocko <mhocko@kernel.org>
To: Shakeel Butt <shakeelb@google.com>
Cc: 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 08:57:01 +0200 [thread overview]
Message-ID: <20200504065701.GB22838@dhcp22.suse.cz> (raw)
In-Reply-To: <CALvZod6Gatw+sX7_hsVPB-O2yMt-ygXUSweQbHwxZHgwdEth4Q@mail.gmail.com>
On Thu 30-04-20 13:20:10, Shakeel Butt wrote:
> On Thu, Apr 30, 2020 at 12:29 PM Johannes Weiner <hannes@cmpxchg.org> wrote:
> >
> > On Thu, Apr 30, 2020 at 11:27:12AM -0700, Shakeel Butt wrote:
> > > Lowering memory.max can trigger an oom-kill if the reclaim does not
> > > succeed. However if oom-killer does not find a process for killing, it
> > > dumps a lot of warnings.
> > >
> > > Deleting a memcg does not reclaim memory from it and the memory can
> > > linger till there is a memory pressure. One normal way to proactively
> > > reclaim such memory is to set memory.max to 0 just before deleting the
> > > memcg. However if some of the memcg's memory is pinned by others, this
> > > operation can trigger an oom-kill without any process and thus can log a
> > > lot un-needed warnings. So, ignore all such warnings from memory.max.
> >
> > Can't you set memory.high=0 instead? It does the reclaim portion of
> > memory.max, without the actual OOM killing that causes you problems.
>
> Yes that would work but remote charging concerns me. Remote charging
> can still happen after the memcg is offlined and at the moment, high
> reclaim does not work for remote memcg and the usage can go till max
> or global pressure. This is most probably a misconfiguration and we
> might not receive the warnings in the log ever. Setting memory.max to
> 0 will definitely give such warnings.
Can we add a warning for the remote charging on dead memcgs?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-05-04 6:57 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 18:27 [PATCH] memcg: oom: ignore oom warnings from memory.max 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 [this message]
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
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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