linux-kernel - Re: [PATCH 0/3] OOM detection rework v4

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Date:	Fri, 4 Mar 2016 08:41:21 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Hugh Dickins <hughd@...gle.com>, Michal Hocko <mhocko@...nel.org>
Cc:	Joonsoo Kim <js1304@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] OOM detection rework v4

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