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Date:   Thu, 8 Aug 2019 20:51:19 +0200
From:   Michal Hocko <mhocko@kernel.org>
To:     Edward Chron <echron@arista.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Roman Gushchin <guro@fb.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        David Rientjes <rientjes@google.com>,
        Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
        Shakeel Butt <shakeelb@google.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, colona@arista.com
Subject: Re: [PATCH] mm/oom: Add killed process selection information
Message-ID: <20190808185119.GF18351@dhcp22.suse.cz>
References: <20190808183247.28206-1-echron@arista.com>
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On Thu 08-08-19 11:32:47, Edward Chron wrote:
> For an OOM event: print oomscore, memory pct, oom adjustment of the process
> that OOM kills and the totalpages value in kB (KiB) used in the calculation
> with the OOM killed process message. This is helpful to document why the
> process was selected by OOM at the time of the OOM event.
> 
> Sample message output:
> Jul 21 20:07:48 yoursystem kernel: Out of memory: Killed process 2826
>  (processname) total-vm:1056800kB, anon-rss:1052784kB, file-rss:4kB,
>  shmem-rss:0kB memory-usage:3.2% oom_score:1032 oom_score_adj:1000
>  total-pages: 32791748kB

A large part of this information is already printed in the oom eligible
task list. Namely rss, oom_score_adj, there is also page tables
consumption which might be a serious contributor as well. Why would you
like to see oom_score, memory-usage and total-pages to be printed as
well? How is that information useful?
-- 
Michal Hocko
SUSE Labs