From: Dmitry Monakhov <dmonakhov@openvz.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>, linux-mm@kvack.org
Cc: cgroups@vger.kernel.org, vdavydov.dev@gmail.com
Subject: Re: [PATCH 1/2] mm: add sysctl to control global OOM logging behaviour
Date: Wed, 08 Nov 2017 15:19:50 +0300 [thread overview]
Message-ID: <87inelklnd.fsf@openvz.org> (raw)
In-Reply-To: <24fb6865-6cc5-2af0-3a99-ea9495791f66@I-love.SAKURA.ne.jp>
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> writes:
> On 2017/11/08 18:18, Dmitry Monakhov wrote:
>> Our systems becomes bigger and bigger, but OOM still happens.
>> This becomes serious problem for systems where OOM happens
>> frequently(containers, VM) because each OOM generate pressure
>> on dmesg log infrastructure. Let's allow system administrator
>> ability to tune OOM dump behaviour
>
> Majority of OOM killer related messages are from dump_header().
> Thus, allow tuning __ratelimit(&oom_rs) might make sense.
>
> But other lines
>
> "%s: Kill process %d (%s) score %u or sacrifice child\n"
> "Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n"
> "oom_reaper: reaped process %d (%s), now anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n"
This still may result in hundreds of messages per second.
So it would be nice to have option to disable OOM logging.
> should not cause problems, for it is easy to exclude such lines from
> your dmesg log infrastructure using fgrep match.
In fact I've considered an abbility to use even more
fine grained log level control:
0: no oom log at all
1: dump only single line logs ( from oom_kill_process and reaper_task)
2: 1+ dump headers
3: 2+ task_stack (which previously controlled by sysctl_oom_dump_task)
What do you think?
>
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next prev parent reply other threads:[~2017-11-08 12:15 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-08 9:18 [PATCH 1/2] mm: add sysctl to control global OOM logging behaviour Dmitry Monakhov
2017-11-08 9:18 ` [PATCH 2/2] mm: memcg control oom logging behavior Dmitry Monakhov
2017-11-08 11:42 ` [PATCH 1/2] mm: add sysctl to control global OOM logging behaviour Tetsuo Handa
2017-11-08 12:19 ` Dmitry Monakhov [this message]
2017-11-08 13:45 ` Tetsuo Handa
2017-11-09 12:56 ` Michal Hocko
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