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Subject: Re: [PATCH 0/3] OOM detection rework v4
References: <1450203586-10959-1-git-send-email-mhocko@kernel.org>
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From: Vlastimil Babka <vbabka@suse.cz>
Message-ID: <56D93C21.9080308@suse.cz>
Date: Fri, 4 Mar 2016 08:41:21 +0100
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To: Hugh Dickins <hughd@google.com>, Michal Hocko <mhocko@kernel.org>
Cc: Joonsoo Kim <js1304@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, Johannes Weiner <hannes@cmpxchg.org>, Mel Gorman <mgorman@suse.de>, David Rientjes <rientjes@google.com>, Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>, Hillf Danton <hillf.zj@alibaba-inc.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>

On 03/03/2016 09:57 PM, Hugh Dickins wrote:
> 
>>
>> I do not have an explanation why it would cause oom sooner but this
>> turned out to be incomplete. There is another wmaark check deeper in the
>> compaction path. Could you try the one from
>> http://lkml.kernel.org/r/20160302130022.GG26686@dhcp22.suse.cz
> 
> I've now added that in: it corrects the "sooner", but does not make
> any difference to the fact of OOMing for me.

Could you try producing a trace with
echo 1 > /debug/tracing/events/compaction/enable
echo 1 > /debug/tracing/events/migrate/mm_migrate_pages/enable

Hopefully it will hint at what's wrong with:
compact_migrate_scanned 424920
compact_free_scanned 9278408
compact_isolated 469472
compact_stall 377
compact_fail 297
compact_success 80
compact_kcompatd_wake 0

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